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随着中国核电的快速发展,核环境安全问题成为备受关注的基础性问题。~(129)I的加速器质谱(AMS)分析能够为我国核环境安全监测提供新的手段。新建立的西安加速器质谱中心对~(129)I测定的灵敏度达2×10~(-14),精度1.75%,为开展~(129)I的应用研究提供了良好的基础。西安加速器质谱中心已经建立了~(129)I-AMS分析的日常测量方法,建立了水样、土壤、植物等多种类型样品的制样方法,创新性地开发了无载体样品制备方法,解决了低碘含量样品中超低水平~(129)I的分离和制备技术难题。利用新建立的方法分析了我国一个核电站周边环境的~(129)I水平,结果表明~(129)I/~(127)I比值范围为(0.8~1.1)×10~(-10),与报道的大范围环境大气沉降本底水平一致,这说明没有明显可测量的~(129)I从核电厂排放到海水中,其周边环境安全可靠。
With the rapid development of China’s nuclear power, nuclear environmental safety has become a fundamental issue of great concern. Accelerator mass spectrometry (AMS) analysis of ~ (129) I can provide a new measure for nuclear environmental safety monitoring in China. The newly established Xi’an accelerator mass spectrometry center has a sensitivity of 2 × 10 ~ (-14) and a precision of 1.75% for ~ (129) I determination, which provides a good foundation for the application of ~ (129) I. Xi’an Accelerator Mass Spectrometry Center has established routine measurement methods for ~ (129) I-AMS analysis and established sample preparation methods for samples of various types such as water samples, soils and plants, and innovatively developed a method for preparation of carrier-free samples. The technical problems of separation and preparation of ultra-low level (129) I in low iodine content samples. The level of ~ (129) I / ~ (127) I was found to be (0.8 ~ 1.1) × 10 ~ (-10) in the peripheral environment of a nuclear power plant in China using the newly established method. The reported background of atmospheric deposition over a wide range of environments is consistent, indicating that there is no measurable emission of ~ (129) I from nuclear power plants into seawater and the surrounding environment is safe and reliable.