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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >Radiation shielding analysis of the concrete hutch of a long beamline of the Advanced Photon Source Upgrade project
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Radiation shielding analysis of the concrete hutch of a long beamline of the Advanced Photon Source Upgrade project

机译：高级光子源升级项目长光束线混凝土壳体的辐射屏蔽分析

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摘要

The radiation shielding analysis of the external concrete enclosure of a feature long beamline of the Advanced Photon Source Upgrade project is described in this work. The beamline has 2 undulators that can operate in two different configurations and the source terms are estimated for the worst configuration using the SRW code in the OASYS package as well as the STAC8 code. The shielding analysis is carried out using the STAC8 code, and for the case of pink beam, with the FLUKA code also. Effective dose rates on contact with the outside surface of the concrete walls for pink, reflected full spectrum and monochromatic beams are calculated. For the monochromatic beams, 2 sets of discrete bandwidths (BW) from the Double Crystal Monochromator (DCM) and the full reflectance of the Double Multilayer Monochromator (DMM) are used. Further, due to the size of the direct beam and the energy domain of Interest in the direct and scattered fields, the importance of the equivalent dose to the lens of the eye is discussed with respect to the shielding calculations of such facilities. The dose rates outside the concrete hutch in the lateral directions calculated using STAC8 is about 50% higher than the FLUKA results for the case of pink beam but may be considered as a reasonable agreement due to the differences in the calculational methodologies. Those dose rates in the lateral and forward directions are higher for the pink beam to allow full occupancy from the radiation protection point of view. For the full spectrum after 3 reflections, the effective dose rates are less than 0.5 μSv/h in the lateral direction but is higher in the forward region below about 22° with respect to the beam direction. For the DCM beams, except for the scenario with one mirror and 0.1%BW, all dose rates are less than 0.5 nSv/h outside the concrete hutch in the lateral directions. Here, the higher harmonics are what contributes to the dose outside the shield and the bandwidths assumed to derive the photon flux thus becomes important. The dose rates with the DMM are generally lower compared to the 0.1% BW DCM beam but are higher than the results obtained with XOP calculated bandwidths.
机译：在这项工作中描述了高级光子源升级项目的特征长度光束线的外部混凝土外壳的辐射屏蔽分析。光束线有2个波浪器，它可以用两种不同的配置操作，并且使用Oasys包中的SRW码以及StAC8代码估计最差配置的源术语。使用STAC8代码进行屏蔽分析，以及粉红色梁的情况，侥幸码也是如此。计算与粉红色，反射的全光谱和单色梁的混凝土壁的外表面接触的有效剂量速率。对于单色梁，使用来自双晶单色器（DCM）的2组离散带宽（BW）和双重多层单色仪（DMM）的完全反射率。此外，由于直接和散射场的感兴趣的能量领域的尺寸，相对于这些设施的屏蔽计算，讨论了对眼睛镜片的等效剂量的重要性。使用STAC8计算的混凝土壳体外的剂量速率比粉红色光束的情况高约50％，但由于计算方法的差异，可能被认为是合理的一致性。粉红色光束的横向和前向方向上的那些剂量速率较高，以允许从辐射保护的视角充分占用。对于3反射后的全谱，在横向方向上的有效剂量速率小于0.5μsv/ h，但相对于光束方向，在大约22°以下的正向区域中较高。对于DCM光束，除了一个镜子和0.1％BW的场景，所有剂量率在横向方向上的混凝土壳体外的小于0.5 nsv / h。这里，较高的谐波是有助于屏蔽外的剂量的是什么，并且假定用于导出光子通量的带宽变得重要。与0.1％BW DCM光束相比，DMM的剂量率通常低于0.1％BW DCM光束，但高于XOP计算带宽获得的结果。

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