Problem 30.62: Radioactive fallout One of the problems of in-air testing of nucl

Question

Problem 30.62: Radioactive fallout

One of the problems of in-air testing of nuclear weapons (or, even worse, the use of such weapons!) is the danger of radioactive fallout. One of the most problematic nuclides in such fallout is strontium-90;(:^{90}{ m Sr}:), which breaks down by eta ^ - decay with a half-life of 28 years. It is chemically similar to calcium and therefore can be incorporated into bones and teeth, where, due to its rather long half-life, it remains for years as an internal source of radiation.

part C:

Question 2:

Explanation / Answer

N =No (2)^-t/T ..

1) B ) N = No(2)^-1/2 => 25 %

C) .391/100 = (2)^-t/T => t =223.96 years

2) A)

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