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目的为保证上海市奉贤区辐射环境监测网络监测数据准确可靠,研究不同仪表对宇宙射线及地表γ辐射剂量率的响应情况。方法在离岸1 km的湖面木船和某室内大厅,将各区辐射仪表进行宇宙射线及地表γ辐射剂量率响应比对。结果不同型号仪器在测量宇宙射线响应时差异明显,相对偏差达76%,但在扣除宇宙射线本底后,不同型号的仪器对于室内γ剂量率响应一致性较好,相对偏差在6%以内。结论通过比对活动对本区的仪器性能有了较好掌握,保证了辐射环境监测网络监测数据的准确可靠。
Objective To ensure the monitoring data of radiation environment monitoring network in Fengxian District of Shanghai is accurate and reliable, and study the response of different instruments to cosmic ray and γ radiation dose rate on the surface. Methods Responding to the cosmic ray and surface gamma radiation dose rate responses of radiometric instruments in each area in a lake wooden boat and an indoor hall with a distance of 1 km. Results The results showed that the difference of different types of instruments was significant when the response of cosmic rays was measured, with a relative deviation of 76%. However, after deducting the background of cosmic rays, the responses of different types of instruments to indoor gamma dose rate were better and the relative deviation was within 6%. Conclusion The instrument performance in this area has been well mastered through comparison activities, which has ensured the accurate and reliable monitoring data of the radiation environment monitoring network.