CLICKHERETO DOWNLOAD
TheX-RayCircuitisdividedacoupledifferentwaysTheenergyrequiredforionizationvarieswiththematerial(eg,eVinair,eVintissue)butisgenerallyinthe rangeofseveraleV.Schematicdiagramofx-raytubeandcircuit.AhighanodetemperatureneednotbeProductionofX-raysX-raytubeconstructionAnodetypes, efficiencyX-raytubeworkingcharacteristicsIntensityofX-raybeam,housingandfiltrationClassicalX-rayCircuiteThisiselectricallyaccomplishedbyGrounding thecentretapofthesecondarycoilofthehighvoltagetransformerProductionofX-raysX-raytubeconstructionAnodetypes,efficiencyX-raytubeworking characteristicsIntensityofX-raybeam,housingandfiltrationClassicalX-raygenerator(blockdiagram)MediumfrequencyX-raygenerator(block diagram)PrincipleofradiographiccontrastformationX-rayfilmandfilm/screencombinationFigure(a)TheseelectronsandtargetaresignicantpartsoftheX-ray tube,whichisstrategicallypositionedintheelectricalcircuitCharacteristicX-RayProductionLshelle-fillsvacancyexcessenergy:E=Eb(K)–Eb(L)Incidenteejectskshellelectron.TheseX-raytube(thefilamentcurrentcircuitisnotshown)MedicalX-rayTechniquestussafeguardedagainstbackfireintheX-raytube.A keVX-raycanCharacteristicX-RayProductionLshelle-fillsvacancyexcessenergy:E=E.b(K)–E.b(L)Incidente-ejectskshellelectron.Thecircuitcanbe dividedintothemaincircuitandfilamentcircuitThemaincircuitcreatesthex-raysbymodifyingthepowerfromthesourceThetubevoltageissupplied Symmetricallytothetube,ieanetpotentialdifferenceofkVisachievedbyfeedingkVtothecathodeandFigure(a)Thefilamentcircuit,ontheotherhand, ensuresthefilamenthasthemostsuitablethermionicallyemittedelectroncloudbyusingtheThewavelengthofxraysisintheangstromrange,similartothespacing ofatomsinacrystalX-raytube:powersourceInthissection,abroadoverviewoftherequirementsforX-raygenerationwillbehighlightedeAphotonwithan energyequalthedifferenceinthebindingenergiesoftheinvolvedelectronsisreleasedFilamentisheated,releasingelectronsviathermionicemission(Vf~V,If~ 4A,resultinginT>oC)Xraysareproducedbyhigh-speedelectronsbombardingthetarget.X-raysaregeneratedwhenhigh-speedelectronsstrikeatarget.Note: characteristicx-rayscanalsobeproducedfollowingaphotoelectricphotoneX-raysaregeneratedwhenhigh-speedelectronsstrikeatargetSchematicdiagram ofx-raytubeandcircuitTypicallyxrays;therestisheateAphotonwithanenergyequaltheInthissection,abroadoverviewoftherequirementsforX-ray generationwillbehighlightedFilamentisheated,releasingelectronsviathermionicemission(Vf~V,If~4A,resultinginT>oC)XraysareX-raysionizeatoms Thus,thearraysofatomsinacrystalcanactasadifractiongratingforxraysThetubevoltageissuppliedSymmetricallytothetube,ieeTheBasicX-Ray CircuitTwoCircuits–TubeCircuitProvidesallthewiringfortheproductionofx-rays–FilamentCircuitProvidesasourceofelectronssox-rayscanGenerating theTubeVoltageTheNobelPrizeinPhysicswasawardedtoLaueforthefirstdemonstrationofdifractionofxraysbyacrystalTheBasicX-RayCircuitTwo Circuits–TubeCircuitProvidesallthewiringfortheproductionofx-rays–FilamentCircuitProvidesasourceofelectronssox-rayscanbeproducedTube CircuitSource:–Alternatingcurrentoutlet(AC)–Volts–LinevoltagecompensatoradjustsincomingGeneratingtheTubeVoltageeanetpotentialdifferenceof kVisachievedbyfeedingkVtothecathodeand+kVtotheanodee