Overview of the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident, with amounts and isotopic compositions of the released radionuclides

Yamamoto, Masayoshi

doi:10.1007/s10967-014-3639-3

Cited by 11 publications

(2 citation statements)

References 20 publications

(25 reference statements)

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“…This accident was classified at the maximum level of 7 on the International Nuclear and Radiological Event Scale (INES) 1 . Following this accident, large amounts of radionuclides generated in the reactor core were released into the environment through hydrogen explosions in unit 1 and 3, and vent operations and leakages in unit 1, 2, and 3 2 . After 8 years, among the released high volatile radionuclides such as 129m Te, 132 Te, 131 I, 133 Xe, 134 Cs, and 137 Cs 3–6 , the long-lived radionuclide 137 Cs (half-life T 1/2 = 30.2 y) still remains and derives a great social influence.…”

Section: Introductionmentioning

confidence: 99%

First determination of Pu isotopes (239Pu, 240Pu and 241Pu) in radioactive particles derived from Fukushima Daiichi Nuclear Power Plant accident

Igarashi

Zheng

Zhang

et al. 2019

Sci Rep

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Radioactive particles were released into the environment during the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. Many studies have been conducted to elucidate the chemical composition of released radioactive particles in order to understand their formation process. However, whether radioactive particles contain nuclear fuel radionuclides remains to be investigated. Here, we report the first determination of Pu isotopes in radioactive particles. To determine the Pu isotopes ( 239 Pu, 240 Pu and 241 Pu) in radioactive particles derived from the FDNPP accident which were free from the influence of global fallout, radiochemical analysis and inductively coupled plasma-mass spectrometry measurements were conducted. Radioactive particles derived from unit 1 and unit 2 or 3 were analyzed. For the radioactive particles derived from unit 1, activities of 239+240 Pu and 241 Pu were (1.70–7.06) × 10 −5 Bq and (4.10–8.10) × 10 −3 Bq, respectively and atom ratios of 240 Pu/ 239 Pu and 241 Pu/ 239 Pu were 0.330–0.415 and 0.162–0.178, respectively. These ratios were consistent with the simulation results from ORIGEN code and measurements from various environmental samples. In contrast, Pu was not detected in the radioactive particles derived from unit 2 or 3. The difference in Pu contents is clear evidence towards different formation processes of radioactive particles, and detailed formation processes can be investigated from Pu analysis.

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Section: Introductionmentioning

confidence: 99%

First determination of Pu isotopes (239Pu, 240Pu and 241Pu) in radioactive particles derived from Fukushima Daiichi Nuclear Power Plant accident

Igarashi

Zheng

Zhang

et al. 2019

Sci Rep

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show abstract

“…The lack of bioturbation and presence of 134 Cs (4–53 Bq kg −1 for Site 20 and 2–85 Bq kg −1 for Site 21) and 137 Cs (75–104 Bq kg −1 for Site 20 and 4–161 Bq kg −1 for Site 21) in the covering mud (Fig. 4 A,B and Supplementary Table S3 ) indicate that the covering mud was young and deposited after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, as the release of 134 Cs into the atmosphere from the FDNPP started on March 12, 2011, peaked on March 15 and continued to March 23, 2011 29 .…”

Section: Resultsmentioning

confidence: 99%

The 2011 Tohoku-oki tsunami-induced sediment remobilization on the Sendai shelf, Japan, from a comparison of pre- and post-tsunami surface sediments

Ikehara

Irino

Saito

2021

Sci Rep

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Tsunamis are generally considered to disturb the seafloor, rework surface sediments, and change seafloor environments. However, the response of the seafloor to such extreme wave events has not been fully elucidated. Herein, we compare the surface sediments before and after the 2011 Tohoku-oki tsunami on the Sendai shelf and demonstrate that both sandy and muddy sediments were significantly reworked on the shelf. Muddy sediments (> 10 cm thick) were redeposited as graded mud with no or little bioturbation, characterizing the offshore muddy tsunami deposit, while well-sorted sand was found as the sandy tsunami deposit. This redeposited layer could also be retained in the shelf mud sequence. The results imply that the high friction velocity of the tsunami wave and its long-term effect on Sendai Bay might contribute to the large sediment reworking. Part of the resuspended mud moved offshore to the slope area as turbidity currents. Thus, the tsunami is an important mechanism not only for shelf sedimentation but also for deep-sea sedimentation along active plate margins. The detection of 134Cs derived from the Fukushima Daiichi Nuclear Power Plant accident in the redeposited mud indicates that the suspended shelf water state was maintained for some days after the tsunami.

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The Transuranium Elements

2017

Modern Nuclear Chemistry

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Overview of the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident, with amounts and isotopic compositions of the released radionuclides

Cited by 11 publications

References 20 publications

First determination of Pu isotopes (239Pu, 240Pu and 241Pu) in radioactive particles derived from Fukushima Daiichi Nuclear Power Plant accident

First determination of Pu isotopes (239Pu, 240Pu and 241Pu) in radioactive particles derived from Fukushima Daiichi Nuclear Power Plant accident

The 2011 Tohoku-oki tsunami-induced sediment remobilization on the Sendai shelf, Japan, from a comparison of pre- and post-tsunami surface sediments

The Transuranium Elements

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