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## 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