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5/39 MCQs for:
Radioactivity
The effect of long-term radiation exposure is:
Radioactive isotopes used to treat cancer are called:
Which type of radiation can be stopped by a sheet of paper?
What is a Geiger-Müller counter used for?

The activity of a radioactive sample drops from 800 counts/seconds to 200 counts/second in 24 hours.

The half life of the sample is: