中子周围剂量当量仪的校准方法与亚太比对

中子周围剂量当量(率)仪作为中子辐射水平监测的主要设备须采用适当的方法进行准确校准。亚太计量规划组织于2012年组织了该类仪器的校准比对(APMP.RI(III)-S1),比对协议规定采用放射性核素中子源的中子参考辐射场校准主导实验室提供的比对仪器,并推荐采用影锥法和距离变化法对校准结果进行散射中子修正,参比实验室将比对仪器的校准因子及其不确定度作为比对结果上报。中国计量科学研究院参加了本次比对,比对结果表明参比实验室的校准结果在不确定度范围内一致。

Calibration Methods of Neutron Ambient Dose Equivalent Meters and APMP Comparison

Neutron ambient dose equivalent (rate) meters must be calibrated accurately in proper methods as the main instruments for monitoring of neutron radiation level. A comparison for the calibration of ambient dose equivalent meters in ISO neutron reference fields (APMP.RI(III)-S1) was hold in 2012 to support the calibrating capability declared by the member of Asia Pacific Metrology Programme. The neutron radiation field based on the radionuclide neutron sources were recommended to calibrate the instruments provided by the pilot laboratory and shadow cone method and distance variation methods were required for correction of the scatter neutrons. The calibrated factor with uncertainty should be reported by the laboratory took part in the comparison. National Institute of Metrology(NIM) took part in the comparison. The calibration results submitted by the labs took part in the comparison are consistent with each other.