用Si(Li)X射线能谱仪测量了低能放射性源~(55)Fe的辐射强度,用“时间标尺”法对5F型医用X光片和Kodak无屏X光片乳剂对于~(55)Fe辐射的特性曲线作了定量标定.结果表明,对于5F底片,与密度D=1相应的曝光量H_(D=1)=12×10~7photo/cm~2.

With Si(Li) X-ray energy spectrometer, the intensity of low-energy radioactive source 55Pe has been measured and the absolute characteristic curves of emulsion for 5F medical film and Kodak No-screen film under the condition of 55Fe radiation have also been obtained using time-mark exposure technique. When the optical density D of 5F film is equal to 1, then the corresponding exposure H is equal to 12 × 107 photo/cm2.