(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I have attached a picture of the question.

A 2 Ci^{137}Cs source is equal to 2 x (3.7x10^{10}Bq) = 7.4x10^{10}s^{-1}

8 hours a day, 5 days a week and for 50 weeks is a total duration in seconds of 7.2x10^{6}s

An 8 cm lead shield = 0.08 m

IRR99 regulations set an effective dose limit as 20 millisieverts per year. Therefore, 10% of of their effective dose limit is 2 millisieverts = 0.02 m^{2}s^{-2}

2. Relevant equations

None

3. The attempt at a solution

[7.4x1010 s^{-1}x 0.08 m]/7.2x10^{6}s = 0.02 m^{2}s^{-2}- d

d = 2.4x10^{-5}m

I jiggle the equation about in different ways but keep getting small values for d.

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# Homework Help: Radiation Dose Calculation

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