What fraction of the iodine-131 is left after 8 days?Īfter eight days have passed, half of the atoms of any sample of iodine-131 will have decayed, and the sample will now be 50% iodine-131 and 50% xenon-131. 6 days/2 days = 3 half lives 100/2 = 50 (1 half life) 50/2 = 25 (2 half lives) 25/2 = 12.5 (3 half lives) So 12.5g of the isotope would remain after 6 days. One quick way to do this would be to figure out how many half-lives we have in the time given. ![]() ![]() Since the half-life is 8 days, 24 days corresponds to 3 half-lives.
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