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problem43_20

# problem43_20 - 2.6years = =-N The source is barely usable...

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43.20: Note that Eq. 43.17 can be written as follows . 2 2 1 / 0 T t N N - = The amount of elapsed time since the source was created is roughly 2.5 years. Thus, we expect the current activity to be Ci. 3600 Ci)2 5000 ( 5.271years
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Unformatted text preview: 2.6years = =-N The source is barely usable. Alternatively, we could calculate 1 2 1 s) 0.132(year ) 2 ( ln Î»-= = T and use the Eq. 43.17 directly to obtain the same answer....
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