Determination of air luminescence spectra for alpha-emitters with liquid scintillation spectrometers

Abstract Air luminescence spectra have been measured for 210 Po, 238 U and 241 Am with two commercially available liquid scintillation spectrometers. Since the measured end-point of the air luminescence spectra is approx. 18 keV, they can be determined by liquid scintillation counting in the 3 H detection region. The average counting efficiencies measured with the two counting systems were found to be 33.3 and 33.7%, respectively. The air luminescence effect on liquid scintillation counting of gaseous α-emitters is mentioned.