用牙釉电子自旋共振方法估算慢性辐射损伤人员的受照剂量

Retrospective ESR dosimetry for persons chronically exposed to ionizing radiation

目的 建立用牙釉电子自旋共振对慢性辐射损伤人员的受照剂量进行估算的方法。方法 用电子自旋共振仪测定慢性辐射损伤人员牙釉电子自旋共振信号强度 ,用剂量 -效应曲线法和附加剂量法来重建辐射损伤人员的受照剂量 ,探讨牙釉电子自旋共振法估算受照剂量的可行性 ;并比较了不同能量的射线 (1 2 5MeV的γ射线和 6MeV的X射线 )对牙釉电子自旋共振信号强度的影响。结果 用两种方法估算的辐射损伤人员受照剂量基本一致 ;对能量 1 2 5MeV的γ射线和 6MeV的X射线进行比较 ,无论从剂量 效应曲线的直线系数 ,还是用混合照射后的剂量估算 ,两者差别不大。结论 慢性辐射损伤人员的受照剂量可以用牙釉电子自旋共振方法进行估算 ,射线能量在 1 2 5MeV - 6MeV范围内对牙釉电子自旋共振信号强度影响不大。

Objective To establish an electron spin resonance (ESR) method to estimate the dose of persons chronically exposed to ionizing radiation. Methods ESR method was used to detect the ESR signal intensities of tooth enamel samples from two persons chronically exposed to ionizing radiation.The external calibration curve method and the additive dose method were used to reconstruct the irradiation doses of those teeth in order to find whether it is feasible to estimate the chronic dose by enamel ESR.And the effects of radiation energy on the ESR signal intensities were also observed. Results The estimated doses of two teeth from each person were similar using two methods.Compared 1.25 MeV with 6 MeV X rays,the regression coefficients of the calibration curve were similar,and the doses estimated after combined irradiation were the same as the actually exposed doses. Conclusion Reconstruction of dose for persons chronically exposed to radiation can be achieved using tooth enamel ESR measurement.The radiation energy,between 1.25 MeV and 6 MeV has little effect on tooth enamel ESR measurement. ;