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《Radialization Protection》 1990-01
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ENVIRONMENTAL RADIATION FROM THE BEIJING ELECTRON-POSITRON COLLIDER DURING THE BEAM ADJUSTING OPERATION

Li Jianping;Tang Yueli;Shao Beibei;Liu Shudong;Zhang Zhengang;Qu Guoying;Liu Sude Institute of High Energy Physics, Academic Sinica  
In this paper, the radiation monitoring methods andprimary measurement results during the beam adjusting operation weredescribed. In the Beijing spectrometer room (1 room), the neutron andgamma dose equivalent rates were measured to be 33 and 55 μSv/h inside theshielding wall (monitoring point R-5),and 1.2 and 0.8 μSv/h outsidethe shielding wall (monitoring point R-6)‘The shielding wall was madeof concrete with a dimension of 1 m thick and 6 m high. The neutrondose equivalent rate at 19 radiation monitoring station 100 m from thefirst colliding point was 0.039 μSv/h, and gamma was around backgroundlevel.The data analysis showed that the neutron dose equivalent rate atside boundary is primarily from skyshine of neutrom at the colliding pointin the case of wrong linking up the two focusing magnets.
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