Discussion
Which one of the following radionuclides has the lowest half life period ?
Answer: C
The half life of iodine-131 is about 8 days, whereas carbon-14 has about 5,730 years, strontium-90 about 29 years and caesium-137 about 30 years. So iodine-131 has by far the shortest half life of the four. It is a major short-term radiological hazard after a reactor accident because it collects in the thyroid, but it decays away within weeks, while the other three persist for decades or millennia.
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