A source is placed near a detector. Putting a sheet of paper between them makes the count rate fall to the background level, and adding 5 mm of aluminium makes no further difference. Which radiation is the source emitting?

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Question

A source is placed near a detector. Putting a sheet of paper between them makes the count rate fall to the background level, and adding 5 mm of aluminium makes no further difference. Which radiation is the source emitting?

Accepted Answer

Alpha only — Award 1 mark. Paper alone removing everything above background shows that nothing more penetrating than alpha is present. If beta or gamma were also being emitted, the count rate would have stayed well above background after the paper was inserted.

Answer

Beta and gamma together

Answer

Alpha only

Answer

Beta only

Answer

Gamma only

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