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Even though plutonium-239 (+1/2 = 2.41 x 10 yr) is one of the main fission fuels, it is still a radiation hazard present in
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Answer #1

Decay constant = 0.693/t0.5

=0.000028755 yr-1

t=(2.303/lamda)*log(N0/Nt)

Time taken to 87 percent decay =(2.303/0.00002875)*log(100/13)

=7.1*10^4 years

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