3.7 If a constant release of a gaseous low-level radioactive isotope from a medi

Question

3.7 If a constant release of a gaseous low-level radioactive isotope from a medical facility is allowed, what would be the acceptable release rate (in terms of millirem/h) given the data below; (a) Acceptable annual extra individual risk imposed by this release should not exceed l-in- 1,000,000. (b) Population density around the facility 15,000 per square mile. (c) Only a radius of I mile around the release site is considered affected. (d) Because of variations in wind direction, weather, and movement of people, an average person is assumed to be exposed to a total cumulative exposure time of about 3 months per year. (e) Due to a rapid decay, the radioactivity is decayed exponentially with a rate of 0.1 rem/mile as it moves from the release outward. (f) The population dose relation which describes all the health effects of this exposure is 10,000 person-rem = 1 fatality. (g) Ignore the change in the concentration as the radioactivity moves outward.

Explanation / Answer

The acceptable limit for a radioactive isotope release from a medical facility would be (d)

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