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| Estimation of the Protection Distance in Mobile Gamma-ray Radiography |
| WEI Zheng, DIAO Duan-yang, ZHANG Ping |
| Jiangsu Radiation Environmental Management and Monitoring Center, Nanjing 210019 China |
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Abstract Objective To discuss the protection distance of unshielded γ ray in industrial radiography in open areas, and help the radiation workers to divide the boundary of controlled area and supervised area.Methods The distance was estimated by using the point-source formula and considering the absorption of air on different energy γ-ray.It's in line with the dose-rate limit of the control area and supervised area boundary.Rusults The controlled area and supervised area distance of commonly used radioactive sources 60Co, 192Ir and 75Se with different activity was given.Conclusion The distance of controlled area was reduced about 10% to 20% while considering the air absorption, the supervised area was reduced more than 20%.The radiation workers can use it to ensure the barriers fast and accurate.
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Received: 20 January 2010
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| [1] |
. [J]. , 2010, 19(2): 208-209. |
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