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Constants and Conversion Factors Γ for 137Cs=0.33 R m2/Ci hr C=0.00873 J/kg R Mass attenuation coefficient...

Constants and Conversion Factors Γ for 137Cs=0.33 R m2/Ci hr C=0.00873 J/kg R Mass attenuation coefficient of water=0.0326 cm2/g Mass attenuation coefficient of air=0.0293 cm2/g Attenuation coefficient of lead=1.23 cm−1 For x-rays, 1Gy = 1Sv 1. What is the total exposure at a point 0.5 m from a 50 mCi source of 137Cs after 3 hours? Answer .198R 2/Assuming a person is made entirely of water, what is the dose to the person at the same distance from the source as above? 3/If this person was shielded by 2 cm of lead at a distance of 2m from the source, what will the new dose to the person be? 4/ If the person is a member of the public and was exposed continuously to the dose in Question 3, how long will it take before this person reaches his yearly limit? Annual limit of exposure for the public is 1mSv. For x-rays 1 Gy=1 Sv. 5/ What is the time needed to reach the limit if there is no lead? 6)What is the time needed if there is lead, but a much stronger source of 3Ci?

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genius_generous answered 2 years ago
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