A radioactive isotope has a half-life of 3 days. It's current activity 52 Bq. Calculate its activity 9 days ago. Half Life
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A radioactive source has an activity of 800 Bq. It has a half-life of 4 hours. Calculate its activity after 24 hours.
Those patients who develop tyroid cancer are treated with a certain radioactive isotope before attending surgery. The isotope is ...
The activity of a source is 680 Bq. After one full day its activity is has fallen to 85 Bq. Calculate its half-life.
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