Decays by positron emission
Gallium-68 decays by positron emission, with a half-life of 68.3 min. How much 68Ga remains from a 10.0 mg sample after 683 min?
a) 1.0 mg
b) 1.0 X 10-10 mg
c) 9.8 X 10-3 mg
d) 2.2 X 10-2 mg
e) 6.1 X 10-7 mg
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