Professional Development for Health & Safety Experts ASP-CSP Question 09/28/2017 – Science and Math
Cobalt-60 has a half-life of 5.27 years. The current activity level of a Co-60 source is measured to be 30 curies. What will the activity level of the source be in 100 years?
A A 0.5 A. B. C. D.
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58 microcuries microcuries 58 millicuries 150 millicuries 15 curies (Solution on next page)
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Professional Development for Health & Safety Experts
Solution:
A A 0.5
/
A 30 Ci0.5
.
A 30 Ci0.5. A = 30(0.00000194) = 5.8 x 10 -5 Ci = 58 µCi The correct solution is A.
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