Christ G, Nüsslin F
Abteilung Medizinische Physik, Universität Tübingen.
Strahlenther Onkol. 1990 Apr;166(4):297-300.
Ten ionization chambers (PTW), partly of different type, which all have been calibrated in terms of absorbed dose to water, were used to compare the absorbed dose indicated in a reference geometry at 8 MV X-rays. The standard deviation of the mean value of the absorbed dose determined for all chambers was 0.5%. Since 4 chambers have been calibrated in terms of absorbed dose to water and in exposure, the absorbed dose to water was determined from indicated value according to both calibration procedures. The dose values obtained via the energy dose calibration turned out to be about 2.5% less compared to the result when applying the exposure calibration factor.
使用了十个电离室（PTW），部分型号不同，所有电离室均已按照水吸收剂量进行校准，用于比较在8兆伏X射线参考几何条件下指示的吸收剂量。为所有电离室确定的吸收剂量平均值的标准偏差为0.5%。由于有4个电离室已按照水吸收剂量和照射量进行校准，因此根据两种校准程序从指示值确定水吸收剂量。与应用照射校准因子时的结果相比，通过能量剂量校准获得的剂量值低约2.5%。
