Kim Jungho, Park Hyeonseo, Choi Kil-Oung
Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea
Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
Radiat Prot Dosimetry. 2014 Oct;161(1-4):171-5. doi: 10.1093/rpd/nct327. Epub 2013 Dec 15.
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.
自2004年以来，韩国标准科学研究院使用硫酸锰浴系统对（252）Cf和（241）Am-Be源进行了中子发射率测量。2012年选择了相对测量方法，中子发射率在不确定度范围内与绝对测量方法的结果一致。对一个旧的（252）Cf源的中子发射率进行了三次测量：分别在2004年、2009年和2012年。将（250）Cf成分拟合为（252）Cf +（250）Cf的双指数函数，估计（250）Cf成分与（252）Cf成分的比率在2004年为7.8%，在2012年为46.8%。如果考虑（250）Cf成分的中子发射率，则可以校正旧（252）Cf源中子发射率的低估问题。
