You remember that on that day you quickly retreated to your laboratory to do final experiment with 131I. However you accidentally added HNO3 instead of a reducing agent to the iodide solution, and as a result, you spill the solution and create some 131I vapor. 131I concentrates in the thyroid, where it has a specific effective energy of 1.0 x 10-2 MeV g-1 transformation-1. If inhaled, a total of 1.8 x 105 transformations occur in the thyroid for each Bq intake. The effective half-life is 7 days. Reference Man has an inhalation rate of 0.02 m3 min-1.
(1) What is the committed dose equivalent per Bq intake?
(2) What is the committed effective dose equivalent per Bq intake?
(3) What is the Annual Limit of Intake by inhalation
(i) Based on the stochastic limit of 20 mSv per year?
(ii) Based on the non-stochastic limit of 150 mSv per year?
(iii) Which value should be used at the limit?
(4) As mentioned, you had an air sampler in the breathing zone when your disaster occurred. Air is pumped at a rate of 0.02 m3 min-1 through a charcoal filter with an iodine collection efficiency of 100%. Both the sampling time and inhalation time were 10 minutes and the filter was counted immediately after collection. If the corrected activity on the filter was 4.2 x 106 dpm, what was your committed equivalent dose?
(5) What is your effective dose from the iodine intake on that hirable day?
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