Comparison of gamma-ray coincidence and low-background gamma-ray singles spectrometry

Aerosol samples have been studied under different background conditions using gamma-ray coincidence and low-background gamma-ray singles spectrometric techniques with High-Purity Germanium detectors. Conventional low-background gamma-ray singles counting is a competitive technique when compared to the gamma–gamma coincidence approach in elevated background conditions. However, measurement of gamma–gamma coincidences can clearly make the identification of different nuclides more reliable and efficient than using singles spectrometry alone. The optimum solution would be a low-background counting station capable of both singles and gamma–gamma coincidence spectrometry.

► We compare shielded singles gamma-ray spectrometry to unshielded gamma-ray coincidence method.
► We focus on the limits of detection of radionuclides and measurement of aerosol particulate filters.
► Using gamma-ray coincidences lowers detection limits and improves identification of nuclides.
► Coincidences could shorten measurement times and enhance in-situ measurements at accident sites.