METHODS: The method was based on the value of air kerma Ka to Hp(3) conversion coefficients (Hp(3,0°)/Ka) developed as part of the ORAMED project. High-sensitivity thermoluminescent detectors (MCP-N) produced in Poland were used in the measurements. During the exposure of the detectors, a 137Cs gamma radiation source (irradiator 137Cs/60Co) and a 20cm diameter cylinder filled with water were used.
CONCLUSIONS: The value of conversion coefficient Hp(3,0°)/Ka for energy 511 keV is 1.31Sv/Gy and the calibration factor is (3.46±0.03)·10-4 mSv/N (N - number of counts). Verification of the value of the obtained coefficient carried out using a cylinder with a diameter of 20cm showed a difference of less than 2% in relation to the value obtained by the method described in this paper.
方法:该方法基于作为ORAMED项目的一部分开发的空气kermaKa至Hp(3)转换系数(Hp(3,0°)/Ka)的值。测量中使用了波兰生产的高灵敏度热释光探测器(MCP-N)。在探测器的曝光过程中,使用137Csγ辐射源(辐射器137Cs/60Co)和填充有水的20cm直径的圆柱体。
结论:能量511keV的转换系数Hp(3,0°)/Ka的值为1.31Sv/Gy,校准因子为(3.46±0.03)·10-4mSv/N(N-计数)。使用直径为20cm的圆柱体对所获得的系数的值进行的验证表明,与通过本文所述的方法获得的值相比,差异小于2%。