| 研究実績の概要 |
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.
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