,Possibility of rapidly reporting 226Ra activity in 226Ra-222Rn samples with unknown equilibrium fac

• 作 者: SU Qiong ZHENG Rui CHEN Yong CHENG Jian-Ping
• 机 构: Institute of Nuclear Technology, Department of Engineering Physics, Tsinghua University, Beijing 100
• 出 处: 核技术（英文版）
• 发表日期: 2004年3期
• 关键词: γ spectrometer 226Ra-222Rn sample Secular radioactive equilibrium

This paper reports the observed changes for equilibrium factors between 226Ra and 222Rn with sealing time of the samples. The samples include soil, raw coal, mineral water, cement, rock, etc. Especially the conceptions of "pre-equilibrium time" and "pre-equilibrium factor" have been put forward and methods of measuring and processing data have been given which can be used for rapidly reporting activity of 226Ra in samples with unknown equilibrium factor. It is definitely concluded that, using methods given in the paper, a test report will be completed in 3～7days, instead of one month, after receiving the sample whose activity is not lower than LLD of the spectrometer.