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6 Radioactivity

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Question 83
H

A beta gauge is calibrated when a sheet of the correct thickness gives 500 counts per minute, including a background count rate of 20 counts per minute. Much later, the source activity has halved. The sheet, detector and background are unchanged. What reading should now be used for the correct thickness?

[1]
A

260260260 counts per minute

B

250250250 counts per minute

C

270270270 counts per minute

D

240240240 counts per minute

Markscheme

6 Radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6 Radioactivity

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