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

question 94

Multiple Choice

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 cm³ 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

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