Posted by sue moore on Saturday, February 16, 2013 at 3:53pm.
cobalt60 has a halflife of 5.26 years, how much of a 500 gram sample will be left after 21 years

physical science  drwls, Saturday, February 16, 2013 at 4:01pm
500*'(1/2)^(21/5.26) grams

physical science  Victoria , Tuesday, February 7, 2017 at 3:53pm
You have 14,000 atoms of radioisotope x, which has a half life of 1000 years how much of radioisotope x is after 9000 years ?
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