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Given 1.00 grams of each of the following radioisotopes, Ca-37, U-238, P-32 and Rn-222,which would have the least remaining original isotopes after 100 years?

1) Ca-37
2) U-238
3) P-32
4) Rn-222

1 Answer

3 votes
1) Ca-37, with a half-life of 181.1(10) ms.
User Hamza Azad
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