Radiotion decay

  • Thread starter dagg3r
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  • #1
dagg3r
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Radioactive materials are considered to be relatively safe when their activity has fallen below 0.1% of their initial value.
a How many half-lives does this take?

a 0.1% = 0.001, and 1/2^n = 1/1000
n = 10 or 10 half-lives

how did they get n=10
 

Answers and Replies

  • #2
2-x = 0.001, so taking logarithm of both sides you get x = -log2(0.001) = 3log2(10)=3/log10(2)=3/0.301 = 9.97 = 10
 
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