Abstract
A method is described for the subtraction of Monte Carlo simulated detector spectra of the contribution of natural radiation to measured detector spectra aiming to decrease the decision threshold for the detection of artificial radionuclides. HPGe detector spectra were simulated for selected naturally occurring radionuclides deposited onto a filter used for aerosol collection in a newly developed airborne radioactivity monitoring system. Stepwise, the simulated spectra were fitted to the actually acquired gamma-ray spectrum and the decision threshold was determined. Contribution of cosmic rays background was also estimated.
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