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COSA SONO I CAMPI ELETTROMAGNETICI
Infisicailcampoelettromagneticoèilcampochedescrivel'interazione elettromagnetica.
Ècostituitodallacombinazionedelcampoelettricoedelcampo magneticoedègeneratolocalmentedaqualunquedistribuzionedicarica elettricaecorrenteelettricavariabilineltempo,propagandosi nellospaziosottoformadiondeelettromagnetiche.
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Inelettrodinamicaclassicaèdescrittocomeuncampotensoriale; inelettrodinamicaquantistical'interazioneèvistacomeloscambiodi particelleamassanulla,ifotoni.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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Icampielettricisonocreatidadifferenzedipotenzialeelettrico,otensioni:più altaèlatensione,piùintensoèilcampoelettricorisultante.
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Icampimagneticisicreanoquandocircolaunacorrenteelettrica:piùaltaèla corrente,piùintensoèilcampomagnetico.
Uncampoelettricoesisteanchesenonc’ècorrente.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
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Secircolaunacorrente,l’intensitàdelcampomagneticovariaconilconsumo dipotenza,mentrel’intensitàdelcampoelettricorimanecostante.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
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Icampielettromagneticisonopresentiovunquenelnostroambientedivita,ma sonoinvisibiliall’occhioumano.
Deicampielettricisonoprodottidall’accumulolocaledicaricheelettriche nell’atmosfera,inoccasioneditemporali.
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Ilcampomagneticoterrestrefasìchel’agodiunabussolasiorientilungo la direzionenord-sudedèutilizzatodauccelliepesciperlanavigazione.
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
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Accantoallesorgentinaturali,lospettroelettromagneticocomprende anchecampigeneratidasorgentiartificiali:iraggiX,adesempio,sono utilizzatiperdiagnosticarelafratturadiunacavigliainseguitoadunincidente sportivo.
All’elettricitàfornitadaunaqualunquepresadicorrentesonoassociatidei campielettromagneticiabassafrequenza.
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Infine,diversitipidiradioondeadaltafrequenzasonousatipertrasmettere informazioni,attraversoantennetelevisive,impiantiradiofoniciostazioni radiobasepertelefoniamobile.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
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Unadellecaratteristicheprincipalidiuncampoelettromagnetico(CEM) èla suafrequenzaolacorrispondentelunghezzad’onda.Campidilunghezza d’ondadiversainteragisconocolcorpoumanoinmododiverso.
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Sipossonoimmaginareleondeelettromagnetichecomeunaseriediondeche viaggianoadunavelocitàenorme,quelladellaluce.Lafrequenzadescrive semplicementeilnumerodioscillazioni,ocicli,alsecondo,mentrela lunghezzad’ondarappresentaladistanzatraun’ondaelasuccessiva.
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
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Quindi,lunghezzad’ondaefrequenzasonolegateinmodoindissolubile:più altaèlafrequenza,piùbreveèlalunghezzad’onda.
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Unasempliceanalogiapuòaiutarciadillustrareilconcetto:legateunalunga cordaaunamanigliaeteneteneinmanol’estremitàlibera.Semuovete lentamentelacordainsueingiù,questacreeràunasingola,grandeonda;un movimentopiùrapidogenereràunaseriediondepiùpiccole.Lalunghezza dellacordarimanecostante,quindipiùondevoicreate(cioè,piùaltaèla frequenza),piùpiccolarisultaladistanzatradiloro(cioè,piùbreveèla lunghezzad’onda).
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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ISTITUTO
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AMBIENTALE ORGANIZZAZIONE
VOLONTARIATO
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Lunghezzad’ondaefrequenzadeterminanoun’altraimportantecaratteristica deicampielettromagnetici:leondeelettromagnetichesonotrasportate da particellechiamatequanti.Iquantidifrequenzapiùelevata(e,quindi, di lunghezzad’ondaminore)trasportanopiùenergiadiquellidifrequenzapiù bassa(elunghezzad’ondamaggiore). Alcuneondeelettromagnetiche trasportanoun’energiataledaessereingradodirompereilegamitra molecole.
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![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/bcba0b6403d394919c44e5b824fa6ab5.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/280d3a8c621d7b4e811d85e53c2d0f2c.jpeg)
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
Nellospettroelettromagnetico,iraggigammaemessidaimaterialiradioattivi,i raggicosmiciediraggiXhannoquestaproprietàesonochiamati“radiazioni ionizzanti”.
Icampiicuiquantihannoenergiainsufficienteperrompereilegamimolecolari vengonoinvecechiamati“radiazioninonionizzanti”.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d58b5febd3beffab599331e57cfc45e4.jpeg)
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Icampielettromagneticiprodottidasorgentiartificiali,chesvolgono unruolo diprimopianonelmondoindustrializzato–elettricità,radioondeecampia radiofrequenza–sitrovanonellaregionedellospettro elettromagneticoalunghezzed’ondarelativamentegrandiefrequenze relativamentebasse,ediloroquantinonsonoingradodirompereilegami chimici.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/a105135715ca63179d558cf0bb7cda83.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/bcba0b6403d394919c44e5b824fa6ab5.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/280d3a8c621d7b4e811d85e53c2d0f2c.jpeg)
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/b58ced07ddadfd7c15ffccf399ceda45.jpeg)
Campielettriciesistonoovunquesiapresenteunacaricaelettricapositivao negativa:essiesercitanodelleforzesualtrecarichepresentientroilcampo.
L’intensitàdelcampoelettricosimisurainvoltalmetro(V/m).
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/b58ced07ddadfd7c15ffccf399ceda45.jpeg)
Ogniconduttoreelettricocaricoproduceuncampoelettrico.
Ilcampoesisteanchesenoncircolaalcunacorrente.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d58b5febd3beffab599331e57cfc45e4.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/2435024609f7f3d1e167b6b040c55a1c.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/a24d6a867d1c135d11127ea46fda16e0.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/f3e3deafc54a7abe4e29f65423fa3488.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/9382f3f5ff8d63f62a40daf720043ead.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/bcba0b6403d394919c44e5b824fa6ab5.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/280d3a8c621d7b4e811d85e53c2d0f2c.jpeg)
Maggioreèlatensione,piùaltoèilcampoelettricoaunadeterminatadistanza dalconduttore.
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/a105135715ca63179d558cf0bb7cda83.jpeg)
L’intensitàdeicampielettricièmassimavicinoaunacarica,oaunconduttore carico,ediminuiscerapidamenteallontanandosidaquesti.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/b58ced07ddadfd7c15ffccf399ceda45.jpeg)
Iconduttori,comeadesempioimetalli,schermanomoltoefficacementei campielettrici.
Altrimezzi,comeimaterialidacostruzioneeglialberi,hannounacerta capacitàdischermatura.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
Quindi,icampielettriciprodottiall’esternodalineeadaltatensionesono attenuatidallepareti,dagliedificiedaglialberi.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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Quandoglielettrodottisonointerrati,ilcampoelettricoinsuperficie èa malapenamisurabile.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/a105135715ca63179d558cf0bb7cda83.jpeg)
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/bcba0b6403d394919c44e5b824fa6ab5.jpeg)
Icampimagneticiderivanodalmotodellecaricheelettriche.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d58b5febd3beffab599331e57cfc45e4.jpeg)
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L’intensitàdelcampomagneticosimisurainamperealmetro(A/m);ingenere, nellaricercasuicampielettromagnetici,gliscienziatiusanoinveceun’altra grandezzaaquestacollegata,l’induzionemagnetica(misurataintesla, T,onei suoisottomultiplicomeilmicrotesla,µT).
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/b58ced07ddadfd7c15ffccf399ceda45.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
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![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/bcba0b6403d394919c44e5b824fa6ab5.jpeg)
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
A differenza dei campi elettrici, un campo magnetico si produce soltanto quando un apparecchio è acceso e circola della corrente elettrica.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/b58ced07ddadfd7c15ffccf399ceda45.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/bcba0b6403d394919c44e5b824fa6ab5.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/280d3a8c621d7b4e811d85e53c2d0f2c.jpeg)
Piùalta è la corrente, maggiore è l’intensità del campo magnetico.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
Come i campi elettrici, anche quelli magnetici sono massimi vicino alla loro sorgente e diminuiscono rapidamente a distanze maggiori. I campi magnetici non vengonobloccati dai materiali comuni, come le pareti degli edifici.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d58b5febd3beffab599331e57cfc45e4.jpeg)
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Campi elettriciCampi magnetici
1. I campi elettrici derivano dalla tensione
2.Lalorointensitàsimisurainvoltalmetro(V/m)
3.Uncampoelettricopuòesserepresenteancheseun apparecchioèspento
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/b58ced07ddadfd7c15ffccf399ceda45.jpeg)
4.L’intensitàdelcampoelettricodiminuiscecon ladistanzadallasorgente
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
5.Lamaggiorpartedeimaterialischermainqualche misuraicampielettrici
1.Icampimagneticiderivanodallacorrenteelettrica
2.Lalorointensitàsimisurainamperealmetro(A/m).
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d58b5febd3beffab599331e57cfc45e4.jpeg)
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Generalmente,iricercatoriusanoalsuopostouna grandezzaassociata,l’induzionemagnetica(di solitomisuratainmicrotesla,µT,oinmillitesla,mT)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/a105135715ca63179d558cf0bb7cda83.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/bcba0b6403d394919c44e5b824fa6ab5.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/280d3a8c621d7b4e811d85e53c2d0f2c.jpeg)
3.Icampimagneticiesistonosoloseunapparecchioè accesoecircolaunacorrente
4.L’intensitàdelcampomagneticodiminuiscecon ladistanzadallasorgente
5.Icampimagneticinonsonoschermatidallamaggior partedeimateriali
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
CAMPI ELETTRICI
Collegandounapparecchioaunapresasicreanodeicampielettrici nellospaziocircostante.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/280d3a8c621d7b4e811d85e53c2d0f2c.jpeg)
Piùaltaèlatensione,piùaltoèilcampoprodotto.
Poichélatensionepuòesistereanchesenoncircolacorrente,non occorrecheunapparecchiosiaaccesoperchéesistauncampo elettriconellospaziocircostante.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d58b5febd3beffab599331e57cfc45e4.jpeg)
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![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/bcba0b6403d394919c44e5b824fa6ab5.jpeg)
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
CAMPI MAGNETICI
Icampimagneticisicreanosoloquandocircolanocorrentielettriche.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
Quindiicampielettriciequellimagneticicoesistononell’ambiente. Ilcampomagneticoètantopiùintensoquantomaggioreèlacorrente. Nellatrasmissioneenelladistribuzionedell’elettricitàsiusanotensioni elevate,mentreincasasiusanotensionirelativamentebasse.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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Letensioniinusoneglielettrodomesticivarianopocodaungiorno all’atromentrelecorrentivarianoconilconsumodienergia.
Icampielettriciattornoaicavidiunapparecchiocessanodiesistere quandoquestovienescollegato,maesistonoancoraattornoaicaviche sitrovanonelmuro..
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
DIFFERENZETRACAMPISTATICIECAMPIVARIABILINELTEMPO
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Uncampostaticononvarianeltempo.
Unacorrentecontinua(CC)èunacorrenteelettricachescorreinun’unica direzione.In qualunquedispositivoabatteria,lacorrentescorredaquest’ultimaall’apparecchioper tornarepoiallabatteria.
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Questacorrentecreauncampomagneticostatico.
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Ilcampomagneticoterrestreèanch’essouncampostatico,cosìcomeilcampo magneticocreatodaunacalamita,chepuòesserevisualizzatoosservando lefigurechesi creanoquandosispargedellalimaturadiferroattornoadessa.
INFORMATIVO
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ORGANIZZAZIONE
CAMPI ELETTROMAGNETICI
DIFFERENZETRACAMPISTATICIECAMPIVARIABILINELTEMPO
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Alcontrario,lecorrentialternate(CA)produconocampielettromagneticivariabilinel tempo.
Lecorrentialternateinvertonoilloroversoadintervalliregolari.
Nellamaggiorpartedeipaesieuropeil’elettricitàcambiaversoadunafrequenzadi50 ciclialsecondo,o50hertz.
Cosìpure,icorrispondenticampielettromagneticicambianoilloroorientamento50volte alsecondo.
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Nell’Americasettentrionalel’elettricitàhaunafrequenzadi60Hz.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
SORGENTIDICAMPIELETTROMAGNETICI
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Icampielettromagneticivariabilineltempoprodottidagliapparecchielettricisonoun esempiodicampiafrequenzaestremamentebassa(ELF,extremelylowfrequency).
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IcampiELFhannogeneralmentefrequenzefinoa300Hz.
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Altretecnologieproduconocampiafrequenzaintermedia(IF,intermediatefrequency), confrequenzetra300Hze10MHzecampiaradiofrequenza(RF)confrequenze da10 MHza300GHz.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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SORGENTIDICAMPIELETTROMAGNETICI
Glieffettideicampielettromagneticisulcorpoumanodipendonononsolo dallaloro intensità,maanchedallalorofrequenza.Isistemichecifornisconoelettricità,etuttigli apparecchichelausano,costituiscono leprincipalisorgentidicampiELF;glischermi deicomputer,idispositivianti-taccheggioeisistemiisicurezzasonoleprincipali sorgentidicampiIF;radio,televisione,radar,antenneperlatelefonia cellulareefornia microondesonoleprincipalisorgentidicampiRF.Questicampiinducononelcorpo umanodellecorrentielettricheche,sediintensitàsufficiente,possonoprodurrevari effetticomeriscaldamentoescosseelettriche,secondolaloroampiezza elaloro frequenza.Comunque,perprodurreeffettidiquestogenereicampiesternialcorpo devonoesseremoltointensi,notevolmentealdisopradiquellipresentineinormali ambienti.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
CAMPIELETTROMAGNETICIADALTAFREQUENZA
Itelefonimobili,itrasmettitoriradiotelevisiviediradarproduconocampielettromagnetici aradiofrequenza.
Questicampisonoutilizzatipertrasmettereinformazionisulunghedistanzee costituisconolabasedeisistemiditelecomunicazioneedidiffusioneradiotelevisivain tuttoilmondo.LemicroondesonocampiRFdifrequenzaelevata,nell’intervallodei gigahertz(GHz).Neiforniamicroonde,questevengonosfruttateperscaldare rapidamenteicibi.
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Nellaregionedelleradiofrequenza,icampielettriciequellimagnetici sonostrettamente correlatiegeneralmenteillorolivellovienemisuratointerminididensitàdipotenza,in wattalmetroquadro(W/m2).
ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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PUNTI CHIAVE
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Lospettroelettromagneticoabbracciasorgentisianaturalisiaartificialidicampielettromagnetici.
Lafrequenzaelalunghezzad’ondacaratterizzanouncampoelettromagnetico.Inun’onda elettromagnetica,questeduecaratteristichesonostrettamentelegate l’unaall’altra:piùaltaèla frequenza,piùbreveèlalunghezzad’onda.
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Leradiazioniionizzanti,comeiraggiXegamma,consistonodifotonichetrasportanoun’energia sufficienteperrompereilegamimolecolari.Ifotonidelleondeelettromagneticheafrequenze industrialiearadiofrequenzehanno un’energiamoltoinferiore,enonhannoquindiquesta capacità.
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Icampielettriciesistonoovunquesiapresenteunacaricaesimisuranoin voltalmetro(V/m).I campimagneticiderivanodallacircolazionedicorrentielettriche.Lacorrispondenteinduzione magneticasimisurainmicrotesla(µT),oinmillitesla(mT).
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Nellaregionedelleradiofrequenzeemicroonde,icampielettriciemagneticivengonoconsiderati insieme,comeleduecomponentidell’ondaelettromagnetica.Ladensitàdipotenza,misuratain wattalmetroquadro(W/m2)descrivel’intensitàdiquesticampi.
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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L’esposizioneacampielettromagneticinonèunfenomenonuovo.
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Tuttavia,duranteilventesimosecolo,l’esposizioneambientaleacampi elettromagneticidiorigineumanaècostantementeaumentatainquantola crescitadelladomandadielettricità,ilcontinuoavanzamentodelle tecnologieedicambiamentineicomportamentisocialihannocreato sorgentiartificialiinmisurasempremaggiore.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
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Ognunoèesposto,siaincasasiasulpostodilavoro,aunacomplessa misceladidebolicampielettriciemagneticidovutiallagenerazioneedal trasportodielettricità,aglielettrodomestici,agliapparatiindustriali,alle telecomunicazionieall’emittenzaradiotelevisiva.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/9827a88c36be146fce4a70c497c2b982.jpeg)
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
L’esposizioneacampielettromagneticinonèunfenomenonuovo.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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Tuttavia,duranteilventesimosecolo,l’esposizioneambientaleacampi elettromagneticidiorigineumanaècostantementeaumentatainquantola crescitadelladomandadielettricità,ilcontinuoavanzamentodelle tecnologieedicambiamentineicomportamentisocialihannocreato sorgentiartificialiinmisurasempremaggiore.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/d56ff38984ac9d1aec8982c65ac15701.jpeg)
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Ognunoèesposto,siaincasasiasulpostodilavoro,aunacomplessa misceladidebolicampielettriciemagneticidovutiallagenerazioneedal trasportodielettricità,aglielettrodomestici,agliapparatiindustriali,alle telecomunicazionieall’emittenzaradiotelevisiva.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/9827a88c36be146fce4a70c497c2b982.jpeg)
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
Nelcorpoumanoesistono,ancheinassenzadicampielettriciesterni, piccolissimecorrentidovuteareazionichimichechesonopartedellenormali funzionifisiologiche.Peresempio,inervisiscambianosegnaliattraversola trasmissionediimpulsielettrici.
Lamaggiorpartedellereazionibiochimiche,dalladigestioneall’attività cerebrale,sonoaccompagnatedaunaridistribuzionediparticellecariche.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/fbdb7539ea7d47d3a93364ac0aa10858.jpeg)
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Ancheilcuoreèelettricamenteattivo;ilvostrodottorepuòregistrarne l’attivitàconl’aiutodiunelettrocardiogramma.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
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Campielettriciabassafrequenzaagisconosulcorpoumano,esattamente comeagisconosuqualunquealtromezzo compostodiparticellecariche.
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Quandoicampielettriciagisconosumaterialiconduttori,influenzanola distribuzionedellecaricheelettrichesullalorosuperficieeprovocanou flussodicorrenteattraversoilcorpo,versolaterra.
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Campielettriciabassafrequenzaagisconosulcorpoumanoesattamente comeagisconosuqualsiasialtromezzocompostodiparticellecariche.
Quandoicampielettriciagisconosumaterialiconduttori,influenzanol distribuzionedellecaricheelettrichesullalorosuperficieeprovocanoun flussodicorrenteattraversoilcorpo,versolaterra.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/a105135715ca63179d558cf0bb7cda83.jpeg)
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
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OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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Icampimagneticiabassafrequenzaprovocanolacircolazionedicorrenti all’internodelcorpo.
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L’intensitàdiquestecorrentidipendedall’intensitàdelcampomagnetico esterno.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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Sesufficientementeelevate,questecorrentipossonoprovocarela stimolazionedinerviemuscolioinfluenzarealtriprocessibiologici.
Siaicampielettricisiaquellimagneticiinduconodifferenzedipotenzialee correntinelcorpoma,anchenelcasoincuisisiaimmediatamentealdisott diunalineaadaltatensione,lecorrentiindottesonopiccolissimein confrontoallesoglienecessarieperprovocarescosseedaltrieffettielettrici.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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Ilriscaldamentoèilprincipaleeffettobiologicodeicampielettromagneticia radiofrequenza.
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Neiforniamicroondequestacircostanzaèsfruttataperriscaldareicibi.Ilivellidei campiaradiofrequenzaaiqualilagenteènormalmenteespostasonodigran lunga inferioriaquellirichiestiperprodurreunriscaldamentosignificativo.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/dc49532124e1cac7cac2421289ca868c.jpeg)
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Glieffettidiriscaldamentodelleradioondecostituisconolabasesucui sifondanole attualilineeguida.
![](https://assets.isu.pub/document-structure/221001192350-ce813ece0a44fc4a0699a5d5c44abf0b/v1/3c24ae31b9abab068a956b41ac5acdf5.jpeg)
Gliscienziatistannoindagandoanchelapossibilitàche,aldisottodeilivellidisoglia necessariperprovocareilriscaldamentocorporeo,simanifestinoaltri effetti,legati adesposizionialungotermine.Atutt’oggi,nonèstatafornitaconfermadialcun effettonocivodovutoadesposizionialungotermineabassilivellidicam elettromagnetici,aradiofrequenzaoafrequenzaindustriale;comunque,gliscienziati continuanoattivamentelericercheinquestosettore.
ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
Glieffettibiologicisonorispostemisurabiliaunostimolooaun cambiamentoambientale.Questerispostenonsononecessariamentenocive perlasalute.Adesempio,ascoltaremusica,leggereunlibro,mangiareuna melaogiocareatennisproduconodiversieffettibiologici.Purtuttavia,non cisiaspettachenessunadiquesteattivitàprovochieffettisanitari.Il nostro corpopossiedesofisticatimeccanismiperadattarsiallemoltepliciediverse influenzecheincontriamonelnostroambiente.Icambiamenticontinui fannopartenormaledellanostravita.Ma,naturalmente,ilcorponon possiedemeccanismidicompensazioneadeguatiperqualunqueeffetto biologico.Cambiamentiirreversibili,ochesottoponganoilsistemaastress perlunghiperiodiditempo,possonocostituireunrischioperlasalute.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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Uneffettonocivoprovocaundannorilevabileallasalutedelsoggetto espostooaquelladellasuaprole;uneffettobiologico,dalcantosuo,può tradursiomenoinuneffettodidannoallasalute.Èfuorididubbioche,aldi sopradicertilivelli,icampielettromagneticipossonoinnescaredegli effetti biologici.Esperimenticondottisuvolontarisaniindicanocheesposizionidi brevedurata,ailivellidicampopresentinell’ambienteoincasa,non provocanoalcuneffettonocivoevidente.Esposizionialivellipiùelevati,che potrebberoesserepericolose,sonoprevenutedallelineeguidanazionalied internazionali.Ildibattitoattualesiconcentrasullapossibilitàomenoche l’esposizioneprolungataabassilivellidicampopossasollecitarerisposte biologicheeinfluenzarelostatodibenesseredellepersone.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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Alcunepersonehannoattribuitounagran varietàdisintomiall’esposizioneabassilivelli dicampoelettromagneticoincasa.
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Questisintomicomprendonomalditesta, ansia,suicidioedepressione,nausea, stanchezzaeperditadellalibido.
Almomento,leevidenzescientifichenon suffraganounlegametraquestisintomie l’esposizioneacampielettromagnetici.Almeno alcunidiquestiproblemisanitaripossono esserecausatidalrumoreodaaltrifattori ambientali,oppuredaansielegateallenuove tecnologie.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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L’OMSedaltreorganizzazioniinternazionalihannoesaminatomolte,ediverse,sorgentidi esposizioneacampielettromagneticiinambientidivitaedilavoro,tracuischermidicomputer, lettiadacquaecoperteelettriche,saldatriciaradiofrequenza,apparatiperdiatermiaeradar.Il bilanciocomplessivodelleevidenzemostrachel’esposizioneacampielettromagneticiaitipici livelliambientalinonaccresceilrischiodialcuneffettonocivo,comeabortispontanei, malformazioni,pesoridottoallanascitaemalattiecongenite.Visonostatesegnalazioni occasionalidiassociazionitraproblemisanitariepresunteesposizioniacampi elettromagnetici,nonchésegnalazionidipartiprematuriedipesoridottoallanascitaperfiglidi lavoratoridell’industriaelettrica,malacomunitàscientificanonharitenutochequestieffetti fosseronecessariamentecausatidall’esposizioneaicampi(piuttostochedaaltrifattori,come l’esposizioneasolventi).
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
Nonostantemoltistudi,leevidenzedieffetticancerogenidiqualsiasigenererestano moltocontroverse.E’comunquechiaroche,seicampielettromagneticiavessero effettivamenteuneffettosulcancro,l’aumentodirischio,diqualunque tipo,sarebbe estremamentebasso.Irisultatiottenutifinoadoggipresentanomolteincongruenze, manonsiècomunquetrovatonessunaumentoconsistentedirischiopernessuna formadicancro,néneibambininénegliadulti.
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Uncertonumerodistudiepidemiologicisuggeriscepiccoliaumentidirischiodileucemia infantile,associatiall’esposizioneacampimagneticiabassafrequenzanelleabitazioni.Però, gliscienziatinonsonoingeneregiuntiallaconclusionechequestirisultatiriflettanouna relazionedicausaedeffettotral’esposizioneaicampielapatologia(piuttostocheessere dovutiadartefattinellostudiooriguardareeffettinoncollegatiall’esposizioneaicampi).A questaconclusionesiègiunti,inparte,perchéglistudisuanimaliequellidilaboratorionon hannoprovatoalcuneffettoriproducibilechesiacoerenteconl’ipotesi cheicampi elettromagneticicausinoopromuovanoilcancro.Innumerosipaesisonoincorsostudisu largascalachepossonoaiutareachiarirequestipunti.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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Alcuniindividuidenuncianouna“ipersensibilità”aicampielettriciemagnetici. Questepersonechiedonodisaperesefastidiedolori,malditesta,depressione, letargia,disordinidelsonno,edancheconvulsioniecrisiepilettiche, possanoessereassociatiall’esposizioneacampielettromagnetici.
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Vièbenpocaevidenzascientificachesostengal’ideadiun’ipersensibilitàaicampi elettromagnetici.Recentistudiscandinavihannotrovatoche,incondizionidi esposizioneappropriatamentecontrollate,isoggettinonpresentanoreazioni coerenti.Perdipiù,nonesistealcunmeccanismobiologicoaccettatoche spieghi l’ipersensibilità.Laricercasuquestotipodiindividuièdifficileperchépossono entrareingioco,oltreaglieffettidirettideicampi,moltealtrerispostesoggettive. Ulterioristudisullamateriasonoincorso.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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PUNTI CHIAVE
Esisteunagranvarietàdifattoriambientalicheprovocanoeffettibiologici.“Effettobiologico”nonèsinonimodi “dannoallasalute”.Peridentificareemisurareirischisanitarioccorronoricerchespecifiche.
Abassefrequenze,icampielettricie magneticiesterniinduconolacircolazionedidebolicorrentinelcorpo. Praticamenteintuttiinormaliambienti,ilivellidellecorrentiindottenelcorposonotroppobassiperdarluogoa effettisanitariovvi.Ilprincipale effettodeicampielettromagnetici aradiofrequenzaèilriscaldamentodeitessuti corporei.
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E’indubbiocheesposizionidibrevedurataalivellimoltoaltidicampoelettromagneticopossanoessere pericoloseperlasalute.Leattualipreoccupazionidelpubblicosiconcentranosupossibilieffettialungo terminecausatidaesposizioniacampielettromagneticidilivelloinferioreaquellirichiestiperattivarerisposte biologicheimmediate.
IlprogettointernazionaleCEMdell’OMSèstatopromossoperfornirerispostescientificamentefondateed oggettiveagliinterrogatividelpubblicosuipossibilirischilegatiacampielettromagneticidibassaintensità.
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Nonostanteleampiericerche,atutt’ogginonvisonoevidenzecheportino aconcluderechel’esposizionea bassilivellidicampielettromagneticisiadannosaperlasaluteumana.
Laricercainternazionaleèconcentratasull’esamedipossibiliconnessionitracancroecampielettromagnetici,a frequenzeindustrialiearadiofrequenza.
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ISTITUTO DI SVILUPPO ECO AMBIENTALE ORGANIZZAZIONE DI VOLONTARIATO
OPUSCOLO INFORMATIVO SU CAMPI ELETTROMAGNETICI
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