Morris W T, Owen B
Phys Med Biol. 1975 Sep;20(3):718-27. doi: 10.1088/0031-9155/20/5/002.
This ionization chamber has been designed at the National Physical Laboratory in collaboration with the Hospital Physicists' Association; it is especially suitable for use with electron beams below 10 MeV. The sensitive volume is discshaped, 20 mm in diameter and 2 mm deep along the beam axis. Polarity effect is less than 0.1% at energies up to 6 MeV, allowing the chamber to be used with most existing dosemeter electrometers. The chamber is intended to be calibrated by the user against a secondary standard X-ray chamber using a Perspex phantom in 60Co gamma-radiation. Factors for converting 'exposure' readings to absorbed dose in water are tabulated for beam energies up to 7 MeV.
这个电离室是由国家物理实验室与医院物理师协会合作设计的；它特别适用于能量低于10兆电子伏特的电子束。灵敏体积呈圆盘状，直径20毫米，沿束轴深度为2毫米。在能量高达6兆电子伏特时，极性效应小于0.1%，这使得该电离室可与大多数现有的剂量仪静电计配合使用。该电离室旨在由用户使用有机玻璃模体在60钴伽马辐射下对照二级标准X射线电离室进行校准。对于能量高达7兆电子伏特的束流，列出了将“照射量”读数转换为水中吸收剂量的因子。
