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目的在意外中子照射情况下,研究人体受到的中子照射剂量与固定测量条件下的计数率的关系。方法测量人体血液中的元素23Na在热中子活化作用下生成的放射性同位素24Na衰变时的γ光子计数来估算人体受照剂量。结果在获得的血液样品的γ谱中,能够清晰地获得24Na的含有本底的特征峰和去本底的特征峰,通过解谱可降低本底中40K的1.461M eV的γ峰的干扰,其计数不确定度均小于10%。结论简化了测量步骤,提高了测量速度,适用于快速为中子受照人员的医学救治提供具有较高可信度的剂量学数据。
Objective To study the relationship between the neutron irradiation dose and the counting rate under the condition of fixed measurement under the condition of accidental neutron irradiation. Methods The human exposure dose was estimated by measuring the γ photon count at the decay of 24Na, a radioisotope produced by the thermal neutron activation element 23Na in human blood. Results In the γ spectrum of the obtained blood sample, the background-containing characteristic peak of 24Na and the background-removed characteristic peak can be clearly obtained, and the interference of the γ peak of 1.461M eV at 40K in the background can be reduced by the solution spectrum. Its count uncertainty is less than 10%. Conclusion The measurement procedure is simplified and the measurement speed is improved. The method is suitable for rapidly providing dosimetry data with high reliability for the medical treatment of neutron irradiated persons.