Goldschmidt H
Int J Dermatol. 1976 Apr;15(3):171-81. doi: 10.1111/j.1365-4362.1976.tb00680.x.
The penetration of x-rays should be correlated the depth of the pathological process. The introduction of the "half-value depth" (D1/2) as a guidline in the selection of radiation qualities has greatly simplified cutaneous radiotherapy. Modern dermatologic x-ray units with beryllium windows operated between 10 and 50 (or 100 kV, offer the widest spectrum of radiation qualities suitable for dermatologic therapy, although older types of radiation equipment are still useful for most dermatology indications. Previous risks in dermatologic radiation therapy have been reduced to a large degree by the introduction of new sophisticated safety devices and by a deliberate reduction of unnecessary variations in the selection of physical factors. Beryllium window machine can be operated without changing milliamperage, target-skin distance or dose rate for different indications. The recommended standardization of physical factors offers a safer and easier alternative to previous techniques.
X射线的穿透性应与病理过程的深度相关。引入“半值深度”（D1/2）作为选择辐射质量的指导原则，极大地简化了皮肤放射治疗。带有铍窗的现代皮肤科X射线设备在10至50（或100）千伏之间运行，提供了适用于皮肤科治疗的最广泛的辐射质量范围，尽管较旧类型的放射设备对大多数皮肤科适应症仍有用处。通过引入新的精密安全装置以及有意减少物理因素选择中不必要的变化，皮肤科放射治疗中以前的风险已在很大程度上降低。铍窗机器可在不改变毫安数、靶-皮肤距离或剂量率的情况下针对不同适应症进行操作。推荐的物理因素标准化为以前的技术提供了一种更安全、更简便的替代方法。
