The ALI for inhalation of I-131 is determined by the nonstochastic limit on dose

Question

The ALI for inhalation of I-131 is determined by the nonstochastic limit on dose
equivalent to the thyroid. If as a result of a single intake of 4.32 x 103 Bq, the thyroid will
receive an average dose of 225 mrad of beta during the next 50 years.

a.What is the committed effective dose equivalent to the thyroid?
b.Based on the above information, what is the ALI for I-131 by inhalation?
c.What is the corresponding derived air concentration?
d.The person was monitored in a whole body counter over a period of 6 weeks. The
net counts over this time are shown below. From these data, determine the
metabolic half-life of iodine in the thyroid.
Time(days)     0               14           28         42
Net Counts 14,281      3,825     1,066        297

Explanation / Answer

A- It is the dose resulting from internal radiation exposures.

B_ ALI is Annual Limit on Intake of radioactive Iodine 131 by inhalation.

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