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为了探讨192Ir混凝土防护层厚度的合理设计及其效果,通过比较分析国内外常见两种计算模式,得出合理的混凝土防护层厚度,并对其防护效果进行监测验证。结果显示,由于国内常采用的混凝土半价层厚度值和比释动能常数值比国际原子能机构(IAEA)大,使计算得出的防护层厚度偏大。而采用IAEA标准参数后,国内计算模式计算得出的防护层厚度符合照射应用的实际要求。经对按照该法设计的防护层进行监测显示,其对应医院治疗室四周辐射环境符合国家GB 18871—2002《电离辐射防护与辐射源安全基本标准》中公众辐射剂量<1mSv/a的要求。建议在设计、评价和建设中采用该计算方法进行设计防护。
In order to investigate the reasonable design of the thickness of 192Ir concrete protective layer and its effect, by comparing the two common calculation modes at home and abroad, a reasonable thickness of concrete protective layer is obtained and its protective effect is verified and verified. The results show that the calculated thickness of protective layer is larger than that of the International Atomic Energy Agency (IAEA) due to the commonly used values of half-value thickness and specific energy of kinetic energy of concrete. The use of IAEA standard parameters, calculated by the domestic calculation mode thickness of the protective layer in line with the actual application of irradiation requirements. The monitoring of the protective layer designed according to the law shows that the radiation environment around the corresponding treatment room of the hospital meets the requirements of the public radiation dose <1mSv / a in the national basic standard for ionizing radiation protection and radiation source safety of GB 18871-2002. It is suggested that this calculation be used for design protection in design, evaluation and construction.