PH-2100
Background radiation
Physics · Secondary 4 · Hard · Background radiation
A Geiger–Müller tube is placed near a sealed source and records 260 counts per minute. When the source is removed to a distant store, the tube records 20 counts per minute. If the safe limit for working with the source is 250 counts per minute from the source alone, is it safe to work with this source at this position?
- Yes, because the source count is 240 counts per minute
- Yes, because the total count is 260 counts per minute
- No, because the source count is 260 counts per minute
- No, because the background count is 20 counts per minute
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