浅谈分水坳隧道辐射防护

Radiation-protection for Fenshuiao Tunnel

通过对怀化分水坳隧道的地质情况及防辐射的实际研究,根据隧道放射性分布情况和监测结果,确立了一整套有效的防护措施,主要技术措施是:以移动铅屏、铅围裙屏蔽及混凝土永久性屏蔽为主,以喷雾洒水、通风降尘为辅,降低氡的浓度和射线γ强度,使作业人员所受的辐射剂量降到国家规定的限值(5 mSv/a)以下,同时保护环境不因弃碴和废水而被污染。

According to the investigation into the geologic condition and radiation-protection of Fenshuiao ttmnel at Huaihua city, a set of effective protective measures was determined based on the radioactivity distribution and monitoring data of the tunnel. Main technical measures include： lowering the concentration of radon and the intensity of Y ray by movable lead shielding screen, lead apron shielding and concrete permanent shielding at the first place and with mist and water spray, ventilation and dust suppression as the subsidiary, so that the amount of radiation suffered by working personnel will be less than national standard （5 mSv/a）; protecting environment so that water will not be contaminated by debris and waste water.