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Gamma-Ray Attenuation in Matter

  • #1

Homework Statement


Hi, I am trying to solve for the cross section for a gamma ray energy. The element I am using is Europium and the energy peak is 244.7 keV. From the slope of the graph I was able to determine the mass attenuation coefficient to be 8*10^-5 m^2/kg

Homework Equations


σ=(μ*A) / N

A- molar mass of the element
μ- mass attenuation
N- Avogadro's number
σ- cross section

The Attempt at a Solution


σ= ((8*10^-5)(63)) / (6.023*10^23)


The solution to this seems very small.. I think that the equation that I am using should involve the energy peak... Any thoughts?? Thanks
 

Answers and Replies

  • #2
34,397
10,480
Check your units.

What do you mean by "very small"? Compare it to the typical size of a nucleus.
 

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