当前位置: X-MOL 学术Appl. Radiat. Isot. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Methods for the experimental study of 220Rn homogeneity in calibration chambers.
Applied Radiation and Isotopes ( IF 1.6 ) Pub Date : 2020-07-05 , DOI: 10.1016/j.apradiso.2020.109259
K Mitev 1 , P Cassette 2 , D Pressyanov 1 , S Georgiev 1 , Ch Dutsov 1 , N Michielsen 3 , B Sabot 2
Affiliation  

This work presents two experimental methods for the evaluation of 220Rn homogeneity in calibration chambers. The first method is based on LSC of the 220Rn decay products captured in silica aerogel. The second method is based on application of solid state nuclear track detectors facing the air of the calibration chambers. The performances of the two methods are evaluated by dedicated experiments. The repeatability of the LSC-based method, estimated as relative standard deviation of the LSC measurements of ten silica aerogel samplers exposed under the same conditions is found to be 1.6%. Both methods are applied to study thoron homogeneity in the commercially available 50 L AlphaGuard emanation and calibration container, which was empty and its fan was turned on. It was found that the 220Rn distribution in this case is homogeneous within 10%. Both methods are also applied to test the thoron homogeneity in the BACCARA chamber at IRSN during a thoron calibration exercise. The results show that, at the centre of the chamber where the inputs of the sampling systems of the radon/thoron detectors were put close to each other, the thoron inhomogeneity is less than 10%. However, regions of higher thoron concentrations are clearly identified near the walls and the upper part of the chamber, with 220Rn concentrations being up to 60% higher compared to the concentration at the reference point. These results highlight the importance of the control and assessment of thoron homogeneity in thoron calibrations and in the cases when radon monitors are checked for thoron influence.



中文翻译:

校准室中220Rn均匀性实验研究的方法。

这项工作提出了两种在校准室中评估220 Rn均匀性的实验方法。第一种方法是基于二氧化硅气凝胶中捕获的220 Rn衰减产物的LSC 。第二种方法是基于面向校准室空气的固态核径迹探测器的应用。通过专门的实验评估了这两种方法的性能。发现,在相同条件下暴露的十个硅胶气凝胶采样器的LSC测量值的相对标准偏差估计为基于LSC的方法的重复性为1.6%。两种方法都可用于研究市售的50 L AlphaGuard发射和校准容器中的ron均质性,该容器是空的并且其风扇已打开。发现,在这种情况下,220 Rn的分布在10%内是均匀的。两种方法也都适用于在进行一次校准过程中,在IRSN的BACCARA腔室中测试的均匀性。结果表明,在the / tho探测器的采样系统输入彼此靠近的腔室中心,the不均匀度小于10%。但是,在腔室的壁和上部附近可以清楚地识别出较高的浓度区域,与基准点的浓度相比,220 Rn浓度高出60%。这些结果突显了在托龙校准中以及在检查ra监测仪的托龙影响的情况下,控制和评估托龙同质性的重要性。

更新日期:2020-07-05
down
wechat
bug