Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (07): 70101-070101.

• SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS •

### Dose calculation and measurement for bremsstrahlung at BL18U beamline of SSRF

XU Jiaqiang1,2 XIA Xiaobin1 SHENG Yinxiangzi1 QIN Ruifang1 ZHANG Dong1 FEI Ping’an1 YAO Ming1 LIU Sixin1

1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(University of Chinese Academy of Sciences, Beijing 100049, China)
• Received:2014-04-16 Revised:2014-05-12 Online:2014-07-10 Published:2014-07-07

Abstract: 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.