Liang J C, Zheng P H, Yang Z J, Liu H R, Zhang M, Li Z S, Zhang L, Guo Q J
National Institute of Metrology (NIM), Beijing 100029, China
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
Radiat Prot Dosimetry. 2015 Nov;167(1-3):82-6. doi: 10.1093/rpd/ncv222. Epub 2015 May 5.
Accurate measurement of radon and its progenies is the basis to control the radon dose and reduce the risk of lung cancer caused. The precise calibration of measuring instrument is an important part of the quality control of measurements of the concentration of radon and radon progenies. To establish Chinese national standards and realise reliable calibrations of measuring instrument for radon and its progenies, a radon chamber with regulation capability of environmental parameters, aerosol and radon concentrations was designed and constructed at National Institute of Metrology (NIM). The chamber has a total volume of ∼20 m(3) including an exposure volume of 12.44 m(3). The radon concentration can be controlled from 12 Bq m(-3) to the maximum of 232 kBq m(-3). The regulation range of temperature, relative humidity and aerosol are 0.66 -44.39°C, 16.4 -95 %RH and 10(2) -10(6) cm(-3), respectively. The main advantages of the NIM radon chamber with respect to maintaining a stable concentration and equilibrium factor of radon progenies in a wide range through automatic regulation and control of radon and aerosol are described.
准确测量氡及其子体是控制氡剂量和降低所致肺癌风险的基础。测量仪器的精确校准是氡及其子体浓度测量质量控制的重要组成部分。为制定中国国家标准并实现氡及其子体测量仪器的可靠校准，中国计量科学研究院（NIM）设计并建造了一个具有环境参数、气溶胶和氡浓度调节能力的氡室。该氡室总体积约为20立方米，其中暴露体积为12.44立方米。氡浓度可控制在12贝克勒尔每立方米至最大232千贝克勒尔每立方米之间。温度、相对湿度和气溶胶的调节范围分别为0.66 - 44.39°C、16.4 - 95%RH和10² - 10⁶每立方厘米。描述了中国计量科学研究院氡室通过对氡和气溶胶的自动调节和控制，在宽范围内保持氡子体稳定浓度和平衡因子的主要优点。
