1) We purchased a Cobalt-60 source of the nuclear lab that you will be conductin
ID: 866757 • Letter: 1
Question
1) We purchased a Cobalt-60 source of the nuclear lab that you will be conducting. The half-life of this isotope is 5.27 years. If this radiation source has an initial activity of 3000 counts per second, then how much will remain after 3.00 years? The units are counts per second.
2) If the half-life of Cs-137 is 30.0 years and the amount that initially contaminated the site was 50.0 grams of Cs-137, then how much Cs-127 remained after 10.0 years? The units are grams.
3) Radium was used to make glow-in-the-dark watches before it dawned on people that it may not be a good idea to put a strong radiation source on the public
Explanation / Answer
1.
A=Aoe-0.693T/Thalf or A = Ao
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