Cause of Bump in Uranium Gamma Spectrum

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eXorikos
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Homework Statement


What is the cause for the bump in the lower energies of this spectrum: http://en.wikipedia.org/wiki/File:Gammaspektrum_Uranerz.jpg

The Attempt at a Solution


Is it just normal Compton? I'm doubting that because that is very asymmetric. I can't find anything in any textbook I own. And if it's Compton, why is it so asymmetric? Is that because there are low intensity, low energy gamma peaks?
 
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Seriously nobody that can answer this question? :s
 

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