Measurement of Krypton-85 in samples of atmospheric with Quantulus 1220 device without using a liquid scintillator

Abstract: The possibility of measuring the 85Kr activity with a liquid scintillation spectrometer (LSS) by registering the scintillations in krypton was investigated. It was found that at partial pressure of krypton less than atmospheric, the conversion efficiency of krypton scintillators amounts to 3 keV/photon and is 20 times lower than the conversion efficiency of liquid scintillators. The amplitude of the pulses due to scintillations in krypton is approximately equal to the amplitude of the pulses from Cherenkov radiation which occurs in the walls of the vial under the influence of 85Kr beta particles.