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The Linear Attenuation Coefficient in Lead for 99mTc Gamma Rays

Question 10

Multiple Choice

The linear attenuation coefficient in lead for 99mTc gamma rays (140 keV) is 23 cm-1. What percentage of these gamma rays will be absorbed by a lead apron that contains 0.60 mm of lead?


A) 75%
B) 50%
C) 25%
D) 12.5%

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