title: Development of calibration facility for radon and its progenies at NIM (China).
abstract: 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.
authors.affiliation: National Institute of Metrology (NIM), Beijing 100029, China liangjc@nim.ac.cn.
authors.forename: J C
authors.initials: JC
authors.lastname: Liang
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
authors.forename: P H
authors.initials: PH
authors.lastname: Zheng
authors.affiliation: National Institute of Metrology (NIM), Beijing 100029, China University of Geosciences, Beijing 100083, China.
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Yang
authors.affiliation: National Institute of Metrology (NIM), Beijing 100029, China.
authors.forename: H R
authors.initials: HR
authors.lastname: Liu
authors.affiliation: National Institute of Metrology (NIM), Beijing 100029, China.
authors.forename: M
authors.initials: M
authors.lastname: Zhang
authors.affiliation: National Institute of Metrology (NIM), Beijing 100029, China School of Nuclear Science and Technology, Nanhua University, Hengyang 421001, China.
authors.forename: Z S
authors.initials: ZS
authors.lastname: Li
authors.affiliation: Solid Dosimetric Detector and Method Laboratory, Beijing 102205, China.
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
authors.forename: Q J
authors.initials: QJ
authors.lastname: Guo
mesh_terms: D016902:Air Pollution, Indoor / Q000032:analysis*; D002138:Calibration / Q000592:standards; D002681:China; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005160:Facility Design and Construction / Q000592:standards; D007753:Laboratories / Q000592:standards*; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards*; D011886:Radon / Q000032:analysis* / Q000592:standards*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013048:Specimen Handling / Q000295:instrumentation / Q000592:standards
chemical_list: D011886:Radon