Laboratoire Souterrain de Modane, CNRS-CEA, 1125 route de Bardonnèche, 73500 Modane, France.
J Environ Radioact. 2012 Dec;114:66-70. doi: 10.1016/j.jenvrad.2012.03.003. Epub 2012 Apr 11.
The radioactivity levels in the air of the radionuclides released by the Fukushima accident were measured at the Laboratoire Souterrain de Modane, in the South-East of France, during the period 25 March-18 April 2011. Air-filters from the ventilation system exposed for one or two days were measured using low-background gamma-ray spectrometry. In this paper we present the activity concentrations obtained for the radionuclides (131)I, (132)Te, (134)Cs, (137)Cs, (95)Nb, (95)Zr, (106)Ru, (140)Ba/La and (103)Ru. The activity concentration of (131)I was of the order of 100 μBq/m(3), more than 100 times higher than the activities of other fission products. The highest activities of (131)I were measured as a first peak on 30 March and a second peak on 3-4 April. The activity concentrations of (134)Cs and (137)Cs varied from 5 to 30 μBq/m(3). The highest activity concentration recorded for Cs corresponded to the same period as for (131)I, with a peak on 2-3 April. The results of the radioactivity concentration levels in grass and mushrooms exposed to the air in the Modane region were also measured. Activity concentrations of (131)I of about 100 mBq/m(2) were found in grass.
2011 年 3 月 25 日至 4 月 18 日期间，在法国东南部的莫达讷地下实验室（Laboratoire Souterrain de Modane）测量了福岛事故释放的放射性核素的空气中的放射性水平。使用低本底伽马能谱仪测量了通风系统中暴露一天或两天的空气过滤器。在本文中，我们介绍了获得的放射性核素（131）I、（132）Te、（134）Cs、（137）Cs、（95）Nb、（95）Zr、（106）Ru、（140）Ba/La 和（103）Ru 的活度浓度。（131）I 的活度浓度约为 100 μBq/m3，比其他裂变产物的活度高 100 多倍。（131）I 的最高活度于 3 月 30 日第一次出现峰值，3 月 3 日至 4 日第二次出现峰值。（134）Cs 和（137）Cs 的活度浓度为 5 至 30 μBq/m3。Cs 的最高活度浓度与（131）I 的同一时期相对应，于 4 月 2 日至 3 日出现峰值。还测量了暴露在莫达讷地区空气中的草和蘑菇的放射性浓度水平。在草中发现了约 100 mBq/m2 的（131）I 活度浓度。
