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

question 26

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.If the intensity of gamma rays of a particular energy is reduced by half when they passed through 1 cm of lead,what is the absorption cross section for the gamma rays? The density of lead is 11.3 g/cm³ and its molar mass is 207 g.

• A)3.5 \(\times\) 10^-22 cm²
• B)6.8 \(\times\) 10 ^-22 cm²
• C)4.6 \(\times\) 10 ^-23 cm²
• D)2.1 \(\times\) 10 ^-23 cm²
• E)8.4 \(\times\) 10 ^-24 cm²

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