A 1.00-g sample of radioactive thorium-228 decays via - decay, and 75 counts are recorded in one

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A 1.00-g sample of radioactive thorium-228 decays via β- decay, and 75 counts are recorded in one day by a detector that has 10.0% efficiency (that is, 10.0% of all events that occur are recorded by the detector). What is the lifetime of this isotope?
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University Physics With Modern Physics

ISBN: 978-0073513881

2nd edition

Authors: Wolfgang Bauer, Gary Westfall

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