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A Beam of Gamma Rays Strikes a Lead Target with a Half-Value

Question 7

Multiple Choice

A beam of gamma rays strikes a lead target with a half-value layer of 0.40 cm. What fraction of the photons in the beam will penetrate to a depth of 1.20 cm or more?


A) 0.500
B) 0.400
C) 0.333
D) 0.250
E) 0.125

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