Comparison of two models for measuring radon exhalation rate with a ventilation chamber by numerical simulation
Comparison of two models for measuring radon exhalation rate with a ventilation chamber by numerical simulation
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两种通风室氡析出率数值模拟测量模型的比较
DOI：
10.1088/1748-0221/17/10/p10007
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发表时间：
2022-10
影响因子：
1.3
通讯作者：
Yanliang Tan
中科院分区：
文献类型：
--
作者：
F. Lin;R. Xie;Zhongkai Fan;T. Hu;Y. Mo;S. Liu;S. Yuan;L. Wang;H. Yuan;J. Tang;Yanliang Tan
两种模型可用于测量具有通风室的氡析出率。第一种是带流量计的定制型号，第二种是不带流量计的改进型号。由于现有的氡析出率标准装置不能根据需要调节氡析出率和有效衰变常数来模拟任何待测介质，因此数值模拟可以比较两种模型在不同有效衰变常数下的氡析出率测量结果。模拟计算了3种不同的有效衰变常数和2种不同的氡析出率，结果表明，改进后的模型在氡析出率很低的情况下也能快速准确地测量氡析出率。而定制模型只能在通风量远大于有效衰变常数时才能用于计算氡析出率，且通风室内氡浓度需要较长时间才能稳定。因此，改进后的无流量计模型可以更准确地测量不同有效衰变常数下的氡气呼出率。
Two models can be used to measure the radon exhalation rate with a ventilation chamber. The first is the custom model with a flow meter, and the second is the improved model without flow meter. As the established radon exhalation standard facilities can't simulate any medium to be measured by adjusting the radon exhalation rate and effective decay constants as required, numerical simulation is useful to compare the two models for measuring radon exhalation rate under different effective decay constants. Three different effective decay constants and two different radon exhalation rates were simulated for measuring radon exhalation rates, and the simulation results confirmed that the improved model is quick and accurate even when the radon exhalation rate is very low. While the custom model can only be used to calculate the radon exhalation rates when the ventilation rate is far larger than the effective decay constant, and it takes a long time for the radon concentration inside the ventilation chamber to be stable. Therefore, the improved model without flow meter is more accurate to measure the radon exhalation rate under different effective decay constants.
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