PH-2120
Background radiation
Physics · Secondary 4 · Medium · Background radiation
A sample of a radioactive isotope has a count rate of 1200 counts/min. The background count rate is 200 counts/min. After some time, the total measured count rate falls to 800 counts/min. What is the new count rate due to the source only?
- 600 counts/min
- 800 counts/min
- 400 counts/min
- 1000 counts/min
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