How many milligrams of a 20mg sample of cesium-137 remain after 60 years

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06-05-2020
Chemistry

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How many milligrams of a 20mg sample of cesium-137 remain after 60 years

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khatoon722 khatoon722 · Answer 1 · 2020-05-06T06:06:14+02:00

khatoon722 khatoon722

06-05-2020

Cs -137 has a half life of about 30 years. If 60 years pass, there is two half lives passed so 1/2 * 1/2= 1/4. Take 1/4 and multiply it with the mass given:
(1/4)*20mg=5mg left

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