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Verification of the Thermal Neutron Shielding Effect of the Shielding Door of the LHD Experimental Hall

机译：LHD实验厅屏蔽门的热中子屏蔽效果验证

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Evaluating the performance of the shielding walls and shielding doors at radiation facilities is important to ensure proper radiation safety management. In the first period of the deuterium experiment, the neutron-shielding ability of the shielding door of the experimental hall containing the large helical device (LHD) was evaluated using the gold-foil activation method. The gold foil was inserted into a small gap between the shielding door and the shielding wall. Meanwhile, the shielding effect of the wall against the neutrons and gamma rays was verified using the badge-type dosimeters that were placed both inside and outside the experimental hall near the wall. The radiation derived from Au-198, which was visualized using by imaging plate, reached approximately 35 cm inside the shielding door. The results provided visual evidence that the shielding door safely excluded the thermal neutrons that were generated in an LHD. Furthermore, the measurement results of the badge-type dosimeters confirmed that the neutrons and gamma rays were completely trapped by the concrete wall of the experimental hall.
机译：评估辐射设施的屏蔽墙和屏蔽门的性能对于确保适当的辐射安全管理非常重要。在氘实验的第一阶段，使用金箔活化方法评估了装有大型螺旋装置（LHD）的实验大厅的屏蔽门的中子屏蔽能力。将金箔插入到屏蔽门和屏蔽壁之间的小间隙中。同时，使用徽章型剂量计验证了墙对中子和伽马射线的屏蔽作用，该剂量计放置在靠近墙的实验室内外。通过成像板观察到的来自Au-198的辐射到达屏蔽门内部约35 cm。结果提供了视觉证据，表明屏蔽门安全地排除了LHD中产生的热中子。此外，徽章型剂量计的测量结果证实，中子和伽马射线被实验厅的混凝土墙完全捕获。

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