PH-2102
Background radiation
Physics · Secondary 4 · Hard · Background radiation
A detector measures a count rate of 220 counts per minute from a radioactive source in a laboratory where the background count rate is 20 counts per minute. What is the count rate due only to the source?
- 20 counts per minute
- 180 counts per minute
- 200 counts per minute
- 240 counts per minute
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