A-level Physics · Gamma radiation
Inverse-square law for gamma
Use the inverse-square law for a count rate or a distance, with a background correction.
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Question 1
A small gamma source gives a corrected count rate of 1940 counts per minute at a distance of 0.40 m from a Geiger counter. Calculate the corrected count rate when the counter is 0.99 m from the source. Assume gamma radiation obeys the inverse-square law. Give your answer to 3 significant figures.
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