Barish R J
The Cancer Institute, Catholic Medical Center of Brooklyn and Queens, Jamaica, NY 11432, USA.
Health Phys. 1996 May;70(5):714-6. doi: 10.1097/00004032-199605000-00014.
When designing shielding for total-body irradiation as an additional modality of treatment in an ordinary radiation therapy room, the extended treatment distance used for these patients greatly increases the workload because of the inverse-square factor. In a seeming contradiction to logic, for a facility with an exterior wall in the path of one lateral primary beam, and a restricted area behind the other primary wall, the overall shielding requirements are lower if the TBI patients are treated with the machine oriented toward the occupied interior.
在普通放射治疗室中将全身照射作为一种额外的治疗方式设计屏蔽时，由于平方反比因素，用于这些患者的延长治疗距离会大大增加工作量。看似与逻辑相悖的是，对于一侧主射束路径中有外墙而另一侧主墙后面有受限区域的设施，如果在机器朝向有人居住的室内时对全身照射患者进行治疗，总体屏蔽要求会更低。
