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Dr. Brown has a radioactive source containing 1.2 x 106 (also written 1.2E+06) atoms of
Putonium -238 in 1985, how many atoms will remain in 352 years?
Solution
The half-life of Pu-238 is 87.7 years. In 352 years' time, this will mean that the number of atoms
left is 1.2 * 10^6 * (1/2)^(352/87.7)
That's 74292 atoms left, just about.

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Dr. Brown has a radioactive source containing 1.2 x 106 (also writte.pdf

  • 1. Dr. Brown has a radioactive source containing 1.2 x 106 (also written 1.2E+06) atoms of Putonium -238 in 1985, how many atoms will remain in 352 years? Solution The half-life of Pu-238 is 87.7 years. In 352 years' time, this will mean that the number of atoms left is 1.2 * 10^6 * (1/2)^(352/87.7) That's 74292 atoms left, just about.