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The Intensity of Gamma Rays Passing Through a Material as a Function

Question 100

Multiple Choice

The intensity of gamma rays passing through a material as a function of thickness, x is given by The intensity of gamma rays passing through a material as a function of thickness, x is given by where n is the number of atoms per cm<sup>3</sup> and \sigma is the absorption cross section. It is observed that the intensity of gamma rays of a particular energy is reduced by half when they passed through 1 cm of lead. What is the thickness of lead needed to reduce the intensity to a quarter? A) 1.0 cm B) 1.5 cm C) 2.0 cm D) 3.0 cm E) 4.0 cm where n is the number of atoms per cm3 and σ\sigma is the absorption cross section. It is observed that the intensity of gamma rays of a particular energy is reduced by half when they passed through 1 cm of lead. What is the thickness of lead needed to reduce the intensity to a quarter?


A) 1.0 cm
B) 1.5 cm
C) 2.0 cm
D) 3.0 cm
E) 4.0 cm

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