PH-2086
Background radiation
Physics · Secondary 4 · Medium · Background radiation
A detector measures a count rate of 90 counts per minute from a radioactive source. When the source is removed, the detector still records 18 counts per minute. What is the count rate due to the source alone?
- 18 counts per minute
- 54 counts per minute
- 72 counts per minute
- 108 counts per minute
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