Dictionary:Gamma-ray surveying

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Measurement of naturally occurring gamma rays in the search for radioactive materials. Portable gamma-ray spectrometers incorporate energy-discrimination ability that permits distinguishing between radio-materials. Thus one might measure all gamma rays, only those above 1.3 MeV (for potassium+uranium+thorium), only those above 1.6 MeV (for uranium+thorium), or only those above 2.5 MeV (thorium).