福島県における環境及び人への健康への影響の指標となる人工放射性物質に関する研究

我们研究的主要目标是与Pu和其他放射性元素同位素的检测有关，所有样品都进行了放射性铯活度的伽马能谱测量。我们可以测量134Cs以及升高的137Cs水平；这是FDDNP事故的明显特征。137Cs活度比值接近1,134Cs/137Cs活度比值接近1。137Cs活度浓度范围为0.006~0.216 Bq kg-1，平均值为0.052 Bq kg-1。我们只在三个样品中观察到238Pu，其值通常接近MDC值(0.005 Bq kg-1)。两个样品中238Pu/239240Pu的活度比与全球降尘相吻合，与报告值相当。

The main goal of our study that was connected with detection of Pu and other actinides isotopes, all samples were subjected to gamma spectrometry measurements for radiocaesium activity. We could measure 134Cs as well as elevated level of 137Cs; the obvious signature of the FDDNP accident. The activity concentration of 137Cs ranged between 0.460 ± 0.029 kBq kg-1 and 113.2 ± 7.4 kBq kg-1 for the reference date 11 March 2011 whereas the activity ratio 134Cs/137Cs was close to 1.The activity concentration of 239+240Pu in samples ranged between <0.006 Bq kg-1 and 0.216 Bq kg-1 with an average value of 0.052 Bq kg-1. We could notice 238Pu only in three samples and the values were usually close to MDC (0.005 Bq kg-1). The activity ratios of 238Pu/239+240Pu in two samples coincided with global fallout and were comparable with reported value.