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本文主要介绍对北京正负电子对撞机(BEPC)调束运行期间环境辐射监测的方法和主要结果。在北京谱仪大厅(1厅)活动屏蔽墙(1m厚、6m高混凝土)内、外(监测点R-5、R-6)的中子剂量当量率分别为33和1.2μSv/h,γ剂量当量率分别为55和0.8μSv/h;在距1厅内的第一对撞点100m处的19环境监测站测得的中子剂量当量率曾达0.039μSv/h,γ为本底水平,经分析表明,此中子剂量主要来自对撞点聚焦磁铁接反(束流损失较大)情况下的天空反射。
This paper mainly introduces the methods and main results of the environmental radiation monitoring during the beam-splitter operation of the Beijing Electron Positron Collider (BEPC). The equivalent dose rates of neutron inside and outside the monitoring screens (R-5 and R-6) inside and outside the BSS Hall 1 (1 hall) were 33 and 1.2μSv / h respectively The equivalent dose rates were 55 and 0.8μSv / h, respectively; the neutron dose equivalent rate measured at 19 environmental monitoring stations 100m away from the first collision point in Hall 1 had reached 0.039μSv / h, γ was the background level, The analysis shows that this neutron dose mainly comes from the collimation point focusing magnet reversed (beam loss larger) sky reflection.