Name & Set 220 Rn ) the following results were Count rate/s-1 1 In an experiment to determine the half-life of Radon-220 ( 86 14 C decays with a half-life of 5000 years. If the initial activity of a sample of ______________________________________________________________________________ ___________________________________________________________________________ [3] (ii) Determine the half-life of radon-220 from the graph: ______________________________ [1] Time/s