German Federal Office for Radiation Protection, Köpenicker Allee 120-130, 10318 Berlin, Germany.
J Environ Radioact. 2012 Dec;114:35-40. doi: 10.1016/j.jenvrad.2011.12.016. Epub 2012 Jan 9.
It is shown which information can be extracted from the monitoring of radionuclides emitted from the Fukushima Dai-ichi nuclear power plant and transported to Europe. In this part the focus will be on the analysis of the concentration ratios. While (131)I, (134)Cs and (137)Cs were reported by most stations, other detected radionuclides, reported by some, are (95)Nb, (129m)Te, (132)Te, (132)I, (136)Cs and (140)La. From their activity ratios a mean burn-up of 26.7 GWd/t of the fuel from which they originated is estimated. Based on these data, inventories of radionuclides present at the time of the accident are calculated. The caesium activity ratios indicate emissions from the core of unit 4 which had been unloaded into the fuel storage pool prior to the accident.
从福岛第一核电站排放并输送到欧洲的放射性核素监测中可以提取哪些信息。在这一部分，重点将放在浓度比的分析上。虽然大多数监测站都报告了（131）I、（134）Cs 和（137）Cs，但其他一些监测站报告的其他检测到的放射性核素包括（95）Nb、（129m）Te、（132）Te、（132）I、（136）Cs 和（140）La。根据它们的活度比，估算出它们源自的燃料的平均燃烧量为 26.7GWd/t。基于这些数据，计算了事故发生时存在的放射性核素的库存。铯的活度比表明，来自 4 号机组堆芯的排放物在事故发生前已被卸载到燃料储存池。
