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26 May, 12:26

Tungsten, W-181 is a radioactive isotope with a half life of 121 days. If a medical lab purchase 24 kg of W-181 how much will be left after 1 year?

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  1. 26 May, 15:55
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    3 kg because one year is approximately 3 half-lives of W-181. The amount remaining would be 1/23 or 1/8. That is 3 kg of W-181.
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