电离辐射实验室源装置优化设计和试验验证

Optimal design and experimental verification of ionizing radiation laboratory source equipment

对核电厂电离辐射实验室放射源最大装载活度增加至20 Ci的设计方案进行研究。在新的装载方案下,通过理论和模拟计算,分析了散射腔、锥角增至14°对辐射场散射辐射的影响,对影响测量结果的不确定因素进行了分析和评估,并使用PTW柱形电离室对源装置的辐射场进行了测量验证。结果表明:放射源活度增加后辐射场的各项测量结果与模拟分析基本一致,辐射场相关技术参数也满足GB/T 12162.1标准要求。新的装载方案在通过建标考核后可用于开展核电厂γ剂量率仪的检定工作。

The design scheme of increasing the maximum loading activity of radioactive sources to 20 Ci in the ionizing radiation laboratory of a nuclear power plant has been studied.Under the new loading scheme,the effect of the scattering chamber and the increase of the cone angle to 14°on the scattered radiation from the radiation field was analyzed by theoretical and simulated calculations,and the uncertainty influencing factors of the measurement results were analyzed and evaluated.Finally,the radiation field of the source device was measured and verified using the PTW column ionization chamber.The results show that the measurement results of the radiation field after the increased activity of the radioactive source are basically consistent with the simulation analysis,and the technical parameters of the radiation field also meet the requirements of GB/T 12162.1 standard.The new loading scheme can be used to carry out the calibration ofγdose rate meter in nuclear power plant after passing the standard building assessment.