- 筆頭著者, 責任著者
- GEOCHEMICAL SOC JAPAN
Two types of radioactive particles were isolated from environmental samples collected at various distances from the Fukushima Dai-ichi Nuclear Power Station. "Type A" particles are 2-10 mu m in diameter and display characteristic Cs X-ray emissions when analyzed using energy-dispersive X-ray spectrometry (EDS). "Type B" particles are considerably larger, up to 400 mu m in diameter, with Cs concentrations too low to be detectable with EDS. These larger particles were isolated from the region north of the nuclear reactor site, which was contaminated on March 12, 2011. The specific activity of Type B particles is much lower than Type A, and the mean Cs-134/Cs-137 ratios are similar to 0.93 and 1.04, respectively. The Type B ratio indicates that power station Unit 1 is the source, implying that these larger radioactive particles were discharged on March 12. This study found that different type of radioactive particles were released not only on March 15 but also on March 12.
Web of Science ® 被引用回数 : 27
Web of Science ® の 関連論文(Related Records®)ビュー