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Radioactive isotopes are often introduced into the body through the bloodstream. their spread through the body can then be monitored by detecting the appearance of radiation in different organs. one such tracer is 131i, a β− emitter with a half-life of 8.0

d. suppose a scientist introduces a sample with an activity of 345 bq and watches it spread to the organs.

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Answer:

We are asked for the decay rate (which means the same as activity) after 24 days. The half life is 8 days. After 8 days the activity is halved: A = 425/2 = 212.5Bq ;)

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