Bushong S C, Glaze S A
Health Phys. 1983 Jan;44(1):53-9. doi: 10.1097/00004032-198301000-00007.
Observations of technique factors at 9 radiographic installations dedicated to orthopedic radiography have been made. Monthly area radiation measurements with thermoluminescent dosimeters were made at three of these facilities. The results of these observations and measurements suggest that current NCRP recommended assumptions utilized in protective barrier computations result in considerably more shielding than is necessary. We observed an average workload of 224 mA min/wk and a maximum weekly average of 670 mA min/wk. The use factor for the chest wall averaged 5%. That for all other vertical barriers was less than 1%. The average operating potential was 75 kVp. Room radiation measurements confirm the suggestion that at least two of the walls and the control booth barrier in an orthopedic radiographic facility may be considered secondary barriers.
对9个专门用于骨科放射摄影的射线照相设备的技术因素进行了观察。其中三个设施每月使用热释光剂量计进行区域辐射测量。这些观察和测量结果表明，目前NCRP在防护屏障计算中推荐的假设导致的屏蔽量比实际需要的多得多。我们观察到平均工作量为224毫安分钟/周，每周最大平均值为670毫安分钟/周。胸壁的使用因子平均为5%。所有其他垂直屏障的使用因子均小于1%。平均操作电压为75 kVp。房间辐射测量证实了这样的建议，即在骨科射线照相设施中，至少两面墙和控制 booth 屏障可被视为次级屏障。 （注：原文中“control booth”直译为“控制室”，这里的“booth”在语境中可能有特定含义，也许是“控制间”之类更合适的表述，但根据要求未做修改）
