指环剂量计标准辐射场的建立与验证

摘要

目的：按照ISO技术规范及我国现行标准的相关要求，在国家二级标准剂量学实验室研究与建立用于照射指环剂量计标准曲线的X射线、γ射线标准辐射场，使各地的监测数据具有溯源性。方法：通过标准剂量仪测量不同能量X射线、137Cs及60Co标准源等3个辐射场的空气比释动能率，结合相关标准规范提供的个人剂量当量Hp(0.07)转换系数，确定了照射指环剂量计标准曲线的X射线、γ射线标准辐射场参考条件，并使用热释光(TLD)指环剂量计在国际标准化组织(ISO)推荐的棒模体上照射，完成验证测量。结果：测定的TLD标准曲线线性和能量响应特性，满足ISO和国家标准给出的标准装置相关技术指标的要求。结论：建立的X射线、γ射线标准辐射场可以用于照射指环剂量计标准曲线的技术服务，并为开展相关的研究工作提供实验条件，进一步提高监测数据的可比性和可靠性。%Objective:According to the technical standard of ISO and current regulations in China, the X/γ standard calibration quality for the finger-ring dosimeter irradiation was established in Beijing SSDL, it can ensure the traceability of surveillance data within countrywide.Methods: Air kerma-rate was determined in the X-ray beams,137Cs and60Co by a standard dosimeter, combined transfer coefficientHp(0.07) provided by standards, and confirmed condition of X/γ standard calibration quality for the finger-ring dosimeter irradiation. Using finger-ring TLD dosimeter verified the radiation beam qualities Hp on the ISO finger-phantom.Results: The linearity and energy response of the TLD dosimeter met ISO and national standard in Beijing SSDL.Conclusion: The X/γ standard radiation field can be used for the calibration of finger-ring dosimeter standard curves and experiment of research, and can further promote the comparability and reliability of the surveillance data.