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建立了通过制备大气颗粒物中碘样品并采用加速器质谱(AMS)测量颗粒物样品中129I浓度的方法。采用此方法对日本福岛核电站泄漏事故期间北京大气颗粒物样品进行了129I测量,以此探讨129I在环境监测中的作用。北京地区大气颗粒物129I的测量结果显示,2011年3月26日的大气颗粒物中129I浓度已高于正常本底值的数倍,据推测这部分129I来源于福岛核电站泄漏事故。129I是重要的核裂变产物,其来源具有特殊性,较长的半衰期使其在核反应堆中长期积累,核泄漏早期存在区域环境高浓度129I现象,所以129I-AMS测量在辐射安全及应急监测方面具有潜在优势。
A method was established to measure the 129I concentration in a particulate sample by preparing an iodine sample from the atmospheric particulate and using Accelerator Mass Spectrometry (AMS). This method was used to measure 129I atmospheric particles in Beijing during the Fukushima nuclear accident in Japan in order to explore the role of 129I in environmental monitoring. 129I measurements of atmospheric particulate matter in Beijing show that the 129I concentration of atmospheric particulates on March 26, 2011 was several times higher than normal background value, suggesting that this portion of 129I is derived from the Fukushima Daiichi nuclear accident. 129I is an important nuclear fission product. Its origin is peculiar. The long half-life of 129I accumulates in the nuclear reactor for a long time. The 129I-AMS measurement has high regional 129I phenomenon in the early stage of nuclear leakage. Therefore, 129I-AMS measurement has the advantages of radiation safety and emergency monitoring Potential advantages.