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| Measurement and Analysis on Radiation Protection of A 252Cf neutron Afterloading Radiotherapy Room |
| DENG Jun1, SU Yin-ping1, REN Fu-li2, SONG Yan-chao1, WANG Tuo1, GUO Wen1 |
1. Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088 China;
2. Inner Mongolia Health Supervision Department |
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Abstract Objective To analyze the entity protective effect of 252Cf neutron afterloading radiotherapy room as well as distribution and changing rule of neutron, γ radiation level in the maze, and to accumulate experimental data and experience of radiation protection as well as to provide a scientific basis for the control of occupational exposure by field measurement. Methods When the 252Cf neutron afterloader was on operation, neutron, γ radiation level at concerned points outside entity shielding wall and inside the maze were measured by neutron ambient dose meter and X-γ dose rate meter, respectively. Besides, the law among neutron, γ radiation level and location of concerned points were analyzed based on the nonlinear regression model, the entity protective effect of the radiotherapy room as well as the changing rule of neutron, γ radiation level at concerned points in the maze were also studied. Results The result shows that the neutron, γ radiation level outside the shield of 252Cf neutron afterloading radiotherapy room were around the background level. Meanwhile, neutron, γ radiation level in the radiotherapy room shows exponential decay trend with the increase of the distance to the entrance. Conclusion The protective effect of the 252Cf neutron afterloading radiotherapy room meets the relevant requirements. Long maze setting is an effective way to lower the radiation dose at the radiotherapy room door.
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Received: 20 January 2015
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| [1] |
. [J]. , 2015, 24(1): 71-72. |
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