Weeks K J, Fraass B A, Hutchins K M
Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109.
Med Phys. 1988 May-Jun;15(3):410-4. doi: 10.1118/1.596240.
The characteristics and properties of a new material used for the fabrication of compensators are presented. This material is a special, refined gypsum. It requires a factor of 3 less water to prepare than ordinary gypsums and as a result the attenuation properties are stable over time. The material may be used by itself or mixed with fine metal particles to increase the attenuation per unit thickness. Gypsum, gypsum + steel, and gypsum + iron were investigated. The results of attenuation measurements in narrow- and broad-beam geometries appropriate to design of clinical dose modifying compensators are presented. Practical and technical details associated with the use of these materials are given. These compounds are found to be easy to use, versatile, reliable, environmentally safe, and inexpensive. In addition, an example of their use for dose compensation is given.
介绍了一种用于制造补偿器的新材料的特性和属性。这种材料是一种特殊的精制石膏。与普通石膏相比，它制备时所需的水量少三分之一，因此其衰减特性随时间推移保持稳定。该材料可单独使用，也可与细金属颗粒混合以增加单位厚度的衰减。研究了石膏、石膏+钢和石膏+铁。给出了在适合临床剂量修正补偿器设计的窄束和宽束几何条件下的衰减测量结果。给出了与使用这些材料相关的实际和技术细节。发现这些化合物易于使用、用途广泛、可靠、对环境安全且价格低廉。此外，还给出了它们用于剂量补偿的一个示例。
