A Geier counter registers a count rate of 6,000 counts per minute from a sample of...
A Geier counter registers a count rate of 6,000 counts per minute from a sample of a radioisotope. Eighteen minutes later, the count rate is 1,500 counts per minute. What is the half-life of the radioisotope?
________ minutes
Homework Answers
From 6000 to 1500 is 2 half lives:
6000 to 3000 is one
3000 to 1500 is two
so the half life is 18/2 = 9 minutes
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