2例严重的^(60)Co放射事故受照人员的牙齿剂量估算

Dose Estimation of Two Victims in a Severe Radiation Accident By Using Tooth Enamel.

目的用电子自旋共振方法对山东事故中两例受照人员的3颗牙齿进行剂量估算。方法将受照人员的牙齿经过处理后得到牙釉质样品,进行ESR信号测量,将样品ESR信号的相对强度代入本实验室建立的牙釉质剂量响应曲线后,得到的3颗牙齿的吸收剂量。结果两例受照人员牙釉质ESR吸收剂量剂量分别为:受照人A的牙齿剂量为26.1~29.4Gy;受照人B的两颗牙齿剂量分别为14.9~18.3Gy,15.2~18.5Gy。结论两例受照人员牙釉质ESR剂量测量方法为大剂量照射事故剂量估算提供了一种重要的依据。

Objective To estimate the exposed dose levels of 2 two victims,who died one month after they were accidentally irradiated by Cobalt-60.Methods Three teeth were extracted from 2 victims.The signal intensities of separated enamel samples were measured with ESR spectrometer.The accumulated exposed doses were reconstructed according to a calibration curve established using Cobalt-60 γ-rays.Results A calibration curve between signal intensity and exposed dose was established.The estimated doses of 3 teeth were 26.1~29.4Gy,for victim A,14.9~18.3Gy and 15.2~18.5Gy for victim B.The doses are close to the result of the other Laboratory.Conclusion The application of ESR dosimetry in human tooth enamel could provide important information for a dose estimation of victims exposed to heavy doses of radiation.