共查询到18条相似文献,搜索用时 56 毫秒
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本文描述强度平衡法用于测定^181Hf活度和γ射线发射几率。方法的原理是母核活度等于到达子核基态上所有射线的强度之和。对于^181Hf,这些射线由约97%的γ射线和约3%的转换电子组成。用HPGe探测器测量γ射线发射几率,用文献转换系数计算转换电子发射率。测量活度的总不确定度为±0.8%。482.0keVγ射线发射率测定为0.8055±0.0048。仔细讨论了测量结果的误差,并同文献给出的数据作了 相似文献
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用^54Mn、^57Co、^65Zn、^85Sr、^109Cd、^137Cs等核素发射的KX射线和I(KX)/I(γ)比值法在5 ̄40keV范围内对Si(Li)探测器的效率进行了刻度(不确定度小于2%)。在此基础上,用Si(Li)X射线谱仪系统和HPGeγ射线谱仪系统对核素^75Se和^113Sn的主γ射线和KX射线进行了测量,获得了^75Se和^113Sn的KX射线发射几率,并与文献报道值进行了 相似文献
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87Kr活度测量中干扰核素的扣除 总被引:1,自引:0,他引:1
用内充气正比计数管测量短寿命核素87Kr活度中,存在气体核素85mKr和125Xe的干扰,且在制源过程中无法将杂质核素分离出去.根据各核素半衰期不同的特点,对样品进行跟踪测量,用加权最小二乘法求解线性方程组的系数对干扰气体进行了扣除,准确测量了87Kr的活度. 相似文献
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LIN Cheng-jian ZHANG Gao-long YANG Feng ZHANG Huan-qiao LIU Zu-hua ZHANG Chun-lei ZHOU Ping WU Xiu-kun XU Xin-xing AN Guang-peng Jim Hui-ming YU Ning BAI Chun-lin XU Hu-shan XIAO Guo-qing ZHANG Wen-long GUO Zhong-yan SUN Zhi-yu HU Zheng-guo 《中国原子能科学研究院年报》2006,(1):84-85
The phenomena of two-proton emission are extensively studied in recent years. The nucleus ^29S, which the last two proton locates in 2S1/2 orbit may show such exotic behavior. Our previous experiment shows that the total reaction cross section of ^29S+^28Si has abnormal large value. It indicates that the last two proton occur a diffuse distribution in ^29S. In order to investigate the phenomenon of two-proton emission, a new experiment was performed at HILF-RIBLL of Institute of Modem Physics, Lanzhou. 相似文献
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ZHOU Duo HE Ming YIN Xin-yi DONG Ke-jun WU Shao-yong GUAN Yong-jing JIANG Shan 《中国原子能科学研究院年报》2006,(1):123-123
The zirconium isotope ^93Zr is a long-lived pure beta-particle-emitting radionuclide, which is produced by nuclear fission and neutron activation of the stable isotope ^92Zr. This element is a constituent of the structural components of nuclear reactor vessels. With AMS it should be possible to detect minute amounts of ^93Zr. A Silica gel adsorption chromatography method for radiochemical separation of Zr has been developed to reduce the stable isobar ^93Nb, which is the main interference for the detection. 相似文献