工业辐照设施屏蔽中的x射线散射

Marshall R. Cleland, Richard A. Galloway, Dylan F. Brown
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引用次数: 3

摘要

当高能x射线光子撞击厚屏蔽层时,大部分入射能量被屏蔽材料吸收,但有一部分偏转到侧面或向后进入治疗室。这种效应对于那些在防护罩上有开口的设施是很重要的,这些设施允许产品通过辐照区或迷宫,为操作人员提供进入该区域的通道。在这些开口中的多次散射事件可以降低光子的能量和残余辐射的剂量率,以符合适用的安全法规。给出了基本方程和实例,说明如何在新辐照设施的设计中评估这些散射效应。
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X-ray Scattering in the Shielding of Industrial Irradiation Facilities

When high-energy X-ray photons impinge on thick shields, most of the incident energy is absorbed in the shielding material, but some of it is deflected sideways or backward into the treatment room. This effect is important in facilities that have openings in the shields to allow the passage of products through the irradiation zone or mazes to provide access into this zone for operating personnel. Multiple scattering events in these openings can reduce the energies of the photons and the dose rates of the residual radiation to comply with applicable safety regulations. Basic equations and examples are presented to show how these scattering effects can be evaluated in the designs of new irradiation facilities.

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