Dose rate distribution of photoneutrons in an ID beamline of SSRF: simulations and measurements

doi:10.13538/j.1001-8042/nst.25.050101

Nuclear Science and Techniques ›› 2014, Vol. 25 ›› Issue (5): 050101 doi: 10.13538/j.1001-8042/nst.25.050101

• SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS • Next Articles

Dose rate distribution of photoneutrons in an ID beamline of SSRF: simulations and measurements

XU Jia-Qiang,¹XIA Xiao-Bin,¹SHENG Yin-Xiang-Zi,¹ SHEN Wei-Zu,¹ XU Xun-Jiang¹

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

Contact: XIA Xiao-Bin E-mail:xiaxiaobin@sinap.ac.cn

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XU Jia-Qiang, XIA Xiao-Bin, SHENG Yin-Xiang-Zi, SHEN Wei-Zu, XU Xun-Jiang. Dose rate distribution of photoneutrons in an ID beamline of SSRF: simulations and measurements.Nuclear Science and Techniques, 2014, 25(5): 050101 doi: 10.13538/j.1001-8042/nst.25.050101

Abstract

Abstract:

Photoneutrons, emitted by means of photonuclear interactions when gas bremsstrahlung interacts with beamline components, can be another potential radiation source needed to be considered for shielding design and dose assessment of beamline. In this paper, simulations and measurements of photoneutrons dose rate at beamline BL09U are carried out when Shanghai Synchrotron Radiation Facility (SSRF) running at Top-up mode (3.5 GeV, 235 mA). A geometry model is constructed for the beamline BL09U with considerations of the scattering process of the major optical components. The model is compiled into Monte Carlo simulation code FLUKA to calculate photoneutron dose distribution. Measurements of the photoneutrons dose rate were performed by using Environmental Neutron Monitor (ENM). Observation points were arranged uniformly along the inside and outside of the optical enclosure (OE) of BL09U. The calculation results agree with experiments within the measurements uncertainties. It is verified that photoneutrons dose simulation is reliable. The simulation and measurement methods can be applied to evaluate the neutron dose level of other beamline stations, and provide references for the shielding design of the beamlines at SSRF in the near future.

Key words: Gas bremsstrahlung, Photoneutron, Monte Carlo simulation, Radiation dose, Synchrotron radiation facility

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Dose rate distribution of photoneutrons in an ID beamline of SSRF: simulations and measurements

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