One day you invite your professor over for lunch. You don’t have much to offer,

Question

One day you invite your professor over for lunch. You don’t have much to offer, except an unlimited supply of Brazil nuts (see below). Your professor is worried about his radiation dose, and wants to make sure he does not exceed the public regulatory limit of 1 mSv. It will be assumed that the only contributor to radiation exposure from the cookies is due to alpha emission from U-238 and progeny. The ingestion dose conversion factor (DCF) for U-238 (+progeny) is 9.1x10-9 Sv/Bq. How many bags of Brazil nuts would your professor have to eat in one sitting to get to the public dose limit of 1 mSv?

Explanation / Answer

Given,

The ingestion dose conversion factror(DCF) for U-238 is 9.1*10-9 Sv/Bg

so, Maximum limit of dose does not exceed furthrt = 1mSv

Hence number of Bags of Brazil nuts your professor would eat= (1mSv/9.1*10-9Sv/Bg

=( 10-3Sv / 9.1*10-9Sv/Bg) = 109,890.10= 109890

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