高剂量率近距离治疗源井型电离室校准

Calibration of Well-type Ionization Chamber for High Dose Rate Brachytherapy Source

对高剂量率60Co近距离治疗放射源参考空气比释动能率进行测量并校准井型电离室。根据国际原子能机构推荐方法利用指型电离室测定参考空气比释动能率标准值,进而对井型电离室校准。参考空气比释动能率标准值为1.0613×10^(-2)Gy·m^(2)·h^(-1),井型电离室的校准因子为9.391×10^(5)Gy·m^(2)·h^(-1)·A^(-1);60Co放射源的参考空气比释动能率标准值的不确定度为2.11%(k=2),井型电离室校准因子的不确定度为2.6%(k=2)。实现了60Co近距离治疗放射源参考空气比释动能率的测量及其井型电离室的校准,为高剂量率^(60)Co近距离治疗源的临床质控提供了量值保障。

The reference air kerma rate of high dose rate^(60)Co brachytherapy source was measured and the well-type ionization chamber was calibrated.According to the method recommended by the International Atomic Energy Agency,the standard value of the reference air kerma rate is measured with a finger type ionization chamber,and then the well-type ionization chamber is calibrated.The standard value of reference air kerma rate is 1.0613×10^(-2)Gy·m^(2)·h^(-1),calibration factor of well-type ionization chamber is9.391×10^(5)Gy·m~2·h^(-1)·A^(-1);The uncertainty of reference air kerma rate standard value of^(60)Co brachytherapy source is 2.11%(k=2),and the uncertainty of calibration factor of well-type ionization chamber is 2.6%(k=2).The measurement of reference air kerma rate of^(60)Co brachytherapy source and the calibration of well-type ionization chamber have been realized,providing a quantity guarantee for the clinical quality control of high dose rate^(60)Co brachytherapy source.