上海光源光束线站BL18U轫致辐射剂量的计算与测量  

Dose calculation and measurement for bremsstrahlung at BL18U beamline of SSRF

作　　者：徐加强[1,2] 夏晓彬[1] 盛尹祥子[1] 秦锐芳[1] 张冬[1] 费平安[1] 姚明[1] 刘嗣鑫 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2014年第7期1-6,共6页Nuclear Techniques

摘　　要：轫致辐射是第三代先进同步辐射光源光束线站辐射屏蔽的重点。上海光源(Shanghai Synchrotron Radiation Facility,SSRF)是国际上正在运行的第三代先进同步辐射光源之一。上海光源蛋白质微晶结构光束线(BL18U)线站是正在试运行中的光束线站。本文采用FLUKA软件模拟计算了蛋白质微晶结构光束线(BL18U)线站因轫致辐射的散射和光中子引起的辐射剂量率分布。分析了因狭缝开孔尺寸、储存环内流强的变化所引起的辐射剂量变化。用高灵敏度的光子和中子探测器测量了BL18U光学棚屋外的光子和光中子剂量率。测量结果表明模拟计算的可靠性。本研究采用的模拟和测量方法可用于其它线站的辐射剂量水平评估,并为上海光源后续线站的屏蔽设计提供参考。Background： Gas bremsstrahlung is one of the most important radiation sources that needs to be taken into consideration for shielding design of beamlines at the third generation synchrotron radiation light source. Shanghai Synchrotron Radiation Facility （SSRF） is one of the third generation synchrotron radiation light source in the world. The Protein Micro-crystallography Beamline （BL18U） is one of the commissioning beamlines and is a representative insertion device beamline at SSRF. Purpose： Estimation of radiation dose induced by scattering bremsstrahlung and photoneutrons at BL18U. Methods： Dose rate distribution induced by scattering bremsstrahlung and photoneutrons at BL18U are performed by Monte Carlo simulation code FLUKA. The radiation dose was analyzed with the variation of slits size, beam current at storage ring and the vacuum. Dose rate of photons and photoneutrons at the outside of the optical enclosure of BL18U were measured by using high sensitivity photon and neutron monitors. Results： The measurement results show that the reliability of the simulation. Conclusion： The simulation and measurement methods presented in this study can be applied to evaluate the dose rate level of other beamline stations at SSRF, and provide references to the shielding design for the following beamlines at SSRF in the near future.

关 键 词：同步辐射 光束线站 蒙特卡罗方法 FLUKA 轫致辐射 辐射测量 

分 类 号：TL72[核科学技术—辐射防护及环境保护] R142[医药卫生—公共卫生与预防医学]