高压电离室校准周期的分析和调整

Analysis and Adjustment of Calibration Cycle of High Pressure Ionization Chamber

针对辐射环境在线监测的特点,分析了对高压电离室现行校准周期进行适当调整的必要性和可行性。对高压电离室在线监测全年运行时间的要求是:停机维护等活动的累计时间不能超过7d,出现故障要及时更换,所以,高压电离室适合进行在线校准。通过对在线监测数据的自动化分析,不仅能及时发现环境中空气吸收剂量率的变化,也能及时发现仪器本身可能出现的故障,并给出预警信息。基于相关要求和准则,论证了将高压电离室的校准周期由现行的1年调整为2年是合理并可行的,并讨论了其质量保证措施和经济效益。

In view of the characteristics of radiation environmental on-line monitoring, this paper analyzes the necessity and feasibility of the current calibration cycle of the high pressure ionization chamber(HPIC). There are certain requirements for the annual operating time of HPIC's online monitoring. The cumulative time for technical activities such as downtime and maintenance shall not exceed 7 days, and the fault should be re. placed in time. Therefore, the high pressure ionization chamber is suitable for online calibration. Through the automatic analysis of online monitoring data, the change of air absorbed dose rate and the failure of the instru. ment can be found in time. Also, the early warning information can be given. According to relevant require. ments and guidelines, it is reasonable and feasible that the calibration cycle of HPIC is adjusted from current one year to two years, and its quality assurance measures and economic benefits are discussed.