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我们设计、加工和测试了一台平行平板自由空气电离室,用于测量60—250kV X射线照射量。该电离室主要的参数:极板距为265mm,极板高为352mm,光阑名义直径为6,8,10,12和15mm,有效收集极宽为101.266mm,光阑限束面到收集中心的距离为468.91mm。极化电压为4900V。高压板和收集板之间有24根铝保护带组成保护框,以使电场均匀。用国产F34-1型X射线机作X射线源,用补偿电路测量电离电流。在管电压为
We designed, fabricated and tested a parallel flat free-air ionization chamber for measuring 60-250kV X-ray exposure. The main parameters of the ionization chamber: the plate distance is 265mm, the plate height is 352mm, the aperture diameter of the nominal 6,8,10,12 and 15mm, the effective collection of very wide 101.266mm, diaphragm limit beam to the collection center The distance is 468.91mm. Polarization voltage is 4900V. Between the high pressure plate and the collection plate, there are 24 aluminum protective belts to form a protective frame to make the electric field uniform. With domestic F34-1 X-ray machine for X-ray source, the compensation circuit to measure ionization current. The tube voltage is