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Secondary Radiation

an additional source of background radiation is x-ray fluorescence in the shielding material.

for a lead shield, x-ray energies are 12 keV and 80 keV.

  these x-rays can hinder the accurate examination of photons in a spectrum!

to minimize these effects, the cave should be lined with a material which absorbs lead x-rays. In this case, a 1mm thick sheet of cadmium would be appropriate.

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