title: Measurement of the 250Cf component in a 252Cf neutron source at KRISS.
abstract: Neutron emission rate measurements have been carried out at the Korea Research Institute of Standards and Science using a manganese sulphate bath system for (252)Cf and (241)Am-Be sources since 2004. The relative measurement method was chosen in 2012, and the neutron emission rates agreed with those by the absolute measurement method within uncertainties. The neutron emission rate of an old (252)Cf source has been measured three times: in 2004, 2009 and 2012. The (250)Cf component was fitted to a double-exponential function of (252)Cf+(250)Cf, and the ratio of the (250)Cf component to the (252)Cf component was estimated to be 7.8 % in 2004 and 46.8 % in 2012. Underestimation of the neutron emission rates of old (252)Cf sources can be corrected if the neutron emission rate of the (250)Cf component is taken into account.
authors.affiliation: Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea jungho@kriss.re.kr.
authors.forename: Jungho
authors.initials: J
authors.lastname: Kim
authors.affiliation: Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors.forename: Hyeonseo
authors.initials: H
authors.lastname: Park
authors.affiliation: Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors.forename: Kil-Oung
authors.initials: KO
authors.lastname: Choi
mesh_terms: D000576:Americium; D001608:Beryllium; D002138:Calibration; D002142:Californium / Q000032:analysis*; D003198:Computer Simulation; D004867:Equipment Design; D005720:Gamma Rays; D017895:Manganese Compounds / Q000737:chemistry; D009010:Monte Carlo Method; D009502:Neutrons; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis; D011874:Radiometry / Q000379:methods*; D056910:Republic of Korea; D012542:Scattering, Radiation; D013431:Sulfates / Q000737:chemistry
chemical_list: D017895:Manganese Compounds; D011868:Radioisotopes; D013431:Sulfates; D002142:Californium; D001608:Beryllium; D000576:Americium; C039798:manganese sulfate