将旧单位改变成 SI 单位时,为了对治疗用剂量计提供以水吸收剂量为单位的校准方法,对于10～300kV 管电压的 X 射线,建立了该量的新基准。目前,在此能区内不可能在水模体内绝对测定“水吸收剂量”量。因此,新基准实际上是在模体不同于水的材料(例如石墨和有机玻璃)内“水柯玛”量的标准。作 When the old unit was changed to SI units, in order to provide the therapeutic dosimeter with a calibration method in terms of water absorbed dose, a new reference for this amount was established for X-rays at tube voltages of 10-300 kV. At present, it is impossible to determine the absolute amount of “water absorbed dose” in the water phantom in this energy region. Therefore, the new benchmark is actually a measure of the amount of “hydrocoma” in materials other than water (such as graphite and Plexiglas). Make