A novel algorithm for quick and continuous tracing the change of radon concentration in environment.
A novel algorithm for quick and continuous tracing the change of radon concentration in environment.
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DOI：
10.1063/1.3572271
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发表时间：
2011-04
期刊：
影响因子：
--
通讯作者：
Y. Tan;D. Xiao
中科院分区：
文献类型：
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作者：
Y. Tan;D. Xiao
华南大学的几次氡浓度测量是用RAD 7进行的。我们发现，用RAD 7示踪标准氡室的浓度需要30-40 min。原因有二。第一是要使RAD 7内池氡浓度与环境氡浓度相等，需要有足够的空气循环时间;第二是要使RAD 7内池（218）Po浓度与环境氡浓度相等，需要有足够的衰变时间。采用零阶近似描述环境氡浓度的演化过程，得到了一种快速、连续跟踪环境氡浓度变化的新算法。用该方法校正后的氡浓度与参考值吻合较好。该方法可用于快速跟踪氡浓度变化的仪器的研制和改进。
Several measurements of the radon concentration are performed by RAD7 in the University of South China. We find that 30-40 min is needed for RAD7 for tracing the concentration of the standard radon chamber. There are two reasons. The first is that the sufficient time of air cycle is needed for the radon concentration in internal cell of RAD7 equal to that of the environment; and the second is that the sufficient decay time is needed for the (218)Po concentration in internal cell of RAD7 equal to that of the radon. We used a zeroth order approximation to describe the evolution of the environment radon concentration, and obtained a novel algorithm for quick and continuous tracing the change of radon concentration. The corrected radon concentration obtained through this method is in good agreement with the reference value. This method can be applied to develop and improve the instruments for tracing the change of radon concentration quickly.