title: [Low level alpha activity measurements with pulse shape discrimination--application to the determination of alpha-nuclides in environmental samples].
abstract: Liquid scintillation counting of alpha rays with pulse shape discrimination was applied to the analysis of 226Ra and 239+240Pu in environmental samples and of alpha-emitters in/on a filter paper. The instrument used in this study was either a specially designed detector or a commercial liquid scintillation counter with an automatic sample changer, both of which were connected to the pulse shape discrimination circuit. The background counting rate in alpha energy region of 5-7 MeV was 0.01 or 0.04 cpm/MeV, respectively. The figure of merit indicating the resolving power for alpha- and beta-particles in time spectrum was found to be 5.7 for the commercial liquid scintillation counter.
mesh_terms: D000512:Alpha Particles; D001417:Background Radiation; D001610:Beta Particles; D004785:Environmental Pollutants / Q000032:analysis*; D011005:Plutonium / Q000032:analysis*; D011848:Radioactive Pollutants / Q000032:analysis*; D011883:Radium / Q000032:analysis*; D012588:Scintillation Counting / Q000295:instrumentation / Q000379:methods*
chemical_list: D004785:Environmental Pollutants; D011848:Radioactive Pollutants; D011005:Plutonium; D011883:Radium