Determination of energy of X-ray photons of Am-241

We verified that in the spectrum of the Am-241 source there are two energy peaks, one with energy 60 keV (nuclear radiation of neptunium) and the other with energy approximately 15 keV (characteristic radiation of neptunium). The peak heights are significantly affected by different absorption of gamma photons with various energies in the silicon sensor of the detector. The absorption probability of gamma photons with energy of 60 keV is very small, and therefore the 60 keV peak is appreciably visible only after the influence of absorption is considered.

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