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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
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