PH-2119
Uses and hazards of radioactivity
Physics · Secondary 4 · Hard · Uses and hazards of radioactivity
A hospital uses a radioactive tracer with a half-life of 6 hours to check blood flow. The activity of the tracer in a patient is 4000 counts/min immediately after injection. What is the activity 12 hours later, assuming no tracer is removed from the body?
- 1000 counts/min
- 2000 counts/min
- 500 counts/min
- 400 counts/min
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