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环境中气载放射性碘监测仪参考响应的测量标准为131I放射性参考源,以滤网、活性炭滤纸和活性炭滤盒集成组成的放射性碘采集器为源载体,采用Na131I放射性溶液与硫酸铁反应产生气态碘,并模拟环境采样流速采集气载131I;采用实验方法标定高纯锗?谱仪对以放射性碘采集器为源载体的131I放射源的探测效率,据此测定131I放射性参考源的活度,作为现场校准用的测量标准。初步的实验结果表明,气载碘放射性监测仪参考响应的校准是可行的。
The reference standard of airborne radioactive iodine monitor in the environment was 131I radioactive reference source. The radioactive iodine collector composed of filter, activated carbon filter and activated carbon filter box was used as the source vector. Na131I radioactive solution was reacted with ferric sulfate to produce gaseous Iodine and simulated environmental sampling flow rate to acquire airborne 131I. The detection efficiency of 131I radioactive source with radioactive iodine collector as source carrier was calibrated by experimental method to determine the activity of 131I radioactive reference source, Used as a measurement standard for field calibration. Preliminary experimental results show that calibration of reference response of airborne iodine radioactive monitor is feasible.