# X-ray production rate [closed]

A 100 MeV proton beam of $10^{14}$ proton/s is perpendicularly incident on a rhodium foil 25 $\mu$m in thickness. Estimate the production rate of K and L x-rays(use the figure below).

So far I figured out from above the cross section for L x-rays to be $8\times 10^{2}$ barns and for K x-rays to be $1\times 10^{2}$ barns

I have the right answers for this one but I can't seem to figure out the right formula to use in order to arrive the given answer.

L $1.3\times10^{13}$ per second K $1.6\times10^{12}$ per second

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## closed as off-topic by Kyle Kanos, Jimnosperm, Brandon Enright, Prahar, BMSMay 14 '14 at 4:16

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