Muller-Runkel R, Ovadia J, Borger F, Culbert H, Rohowsky B
Med Phys. 1985 Jan-Feb;12(1):90-2. doi: 10.1118/1.595741.
A device for shaping electron fields from a Therac-20 accelerator is described. The considerable advantage of continuously variable field sizes is enhanced when the shaping device is placed on the lower trimmer bars of the shorter set of electron trimmers, which remain fully adjustable. Cerrobend blocks of 1-cm thickness are sufficient for a 5% attenuation level with 20-MeV electrons and large field sizes.
描述了一种用于塑造来自Therac - 20加速器的电子场的装置。当将整形装置放置在较短的一组电子限束器的下部微调杆上时，连续可变场大小的显著优势得到增强，这些下部微调杆仍可完全调节。对于20兆电子伏特的电子和大场大小，1厘米厚的铈铅玻璃挡块足以达到5%的衰减水平。
