Analysis of data from sensitive U.S. monitoring stations for the Fukushima Dai-ichi nuclear reactor accident

Biegalski, Steven R; Bowyer, Ted W.; Eslinger, Paul W.; Friese, J.A.; Greenwood, Lawrence R.; Haas, Derek A.; Hayes, James C.; Hoffman, Ian; Keillor, Martin E.; Miley, Harry S.; Moring, Mikael

doi:10.1016/j.jenvrad.2011.11.007

Cited by 55 publications

(24 citation statements)

References 3 publications

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“…The 110m Ag/ 137 Cs ratio also follows the fit, though only two data points are available. The 134g Cs/ 137 Cs ratio has been often used as an indicator to distinguish between the fallout of a nuclear bomb and a power reactor, and further to trace their origins (Biegalski et al, 2012). Our 134g Cs/ 137 Cs ratio is calculated to be 1.0 ± 0.1 for March 11, 2011, and this value is consistent with other observations (~1) related to the FDNPP accident (Diaz Leon et al, 2011;Masson et al, 2011;Kanai, 2012;Huh et al, 2012;Aoyama et al, 2012;Oura and Ebihara, 2012).…”

Section: Radioactivity Ratiossupporting

confidence: 87%

One-year monitoring of airborne radionuclides in Wako, Japan, after the Fukushima Dai-ichi nuclear power plant accident in 2011

et al. 2012

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Airborne radionuclides from the accident of Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in 2011 were measured at the RIKEN Wako Institute, Japan, about 220 km to the southwest of FDNPP, from March 15, 2011 to March 16, 2012. Radioactivity concentrations of 140 Ba, 137 Cs, 136g Cs, 134g Cs, 133g I, 132 Te, 131 I, 129m Te, 110m Ag, 99 Mo, and 95g Nb (m: metastable state; g: ground state) were determined by γ-ray spectrometry with a germanium detector. The time variations of the radioactivity concentrations and their ratios in Wako are discussed by referring to those of the ambient effective dose rate as well as the amount of rainfall. The pronounced peaks of the radioactivity concentrations were observed on March 15, 20-21, and 29-31, 2011. The highest concentrations for typical radionuclides in unit Bq m-3 were 8.8 ± 0.2 for 137 Cs, 1.2 ± 0.2 for 136g Cs, 8.5 ± 0.2 for 134g Cs, 4.7 ± 0.3 for 133g I, 58 ± 2 for 132 Te, 8.0 ± 1.2 for 129m Te, and 35 ± 1 for 131 I in the sample collected in the period of March 15, 2011, 11:15-11:45 JST (Japan Standard Time). The 134g Cs/ 137 Cs radioactivity ratio was determined to be 1.0 ± 0.1 for March 11, 2011, and this value was consistent with other observations related to the FDNPP accident. The environmental radioactive contamination in Wako occurred mainly on March 21, 2011, due to the first rainfall after the accident. Keywords: Fukushima Dai-ichi nuclear power plant accident, airborne radionuclide, 131 I, 137 Cs, 134g Cs † Japan Standard Time (JST) is consistently used in this paper; JST = UTC (Universal Time, Coordinated) + 9 h.

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Section: Radioactivity Ratiossupporting

confidence: 87%

One-year monitoring of airborne radionuclides in Wako, Japan, after the Fukushima Dai-ichi nuclear power plant accident in 2011

et al. 2012

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“…According to the (2) North America. The United States [1,27] was the first country outside of Japan where radionuclides released during the Fukushima accident were observed. Excess radioactivity was first detected on March 15, and the observed radionuclides were same as those in Japan.…”

Section: Comparison With the Results From Other Locationsmentioning

confidence: 99%

Monitoring of atmospheric radionuclides from the Fukushima nuclear accident and assessing their impact on Xi’an, China

et al. 2013

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Aerosol radionuclides ( 131 I, 134 Cs, 137 Cs) and gaseous radioactive xenon ( 133 Xe) were monitored at Xi'an, China following the accident at the Fukushima nuclear power plant in March 2011. The additional annual effective dose attributable to the Fukushima emissions was much lower than the public annual effective dose from natural radiation, according to Chinese national standards. The monitoring results were compared with data from other countries as well as with the radionuclide concentrations observed in Xi'an after the Chernobyl nuclear accident in 1986. Possible transport pathways of the released radionuclides from Fukushima to Xi'an were investigated. The occurrence of an anticyclone in the Pacific Ocean region and the extended period over which the radionuclides were released made the determination transport pathways complex, but divergence in the plume and easterly flow evidently brought the initial suite of radionuclides to Xi'an.

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“…Measurements of radionuclides in air and soil worldwide were collated591018192021222324252627282930313233343536. In addition, we use measurements at fourteen sites in Europe summarised in Masson et al15, Bossew et al37 and one site in Ukraine (this study, see Supplementary Table S1).…”

Section: Methodsmentioning

confidence: 99%

Worldwide isotope ratios of the Fukushima release and early-phase external dose reconstruction

Chaisan

Smith

Bossew

et al. 2013

Sci Rep

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Measurements of radionuclides (RNs) in air made worldwide following the Fukushima accident are quantitatively compared with air and soil measurements made in Japan. Isotopic ratios RN:137Cs of 131I, 132Te, 134,136Cs, are correlated with distance from release. It is shown, for the first time, that both within Japan and globally, ratios RN:137Cs in air were relatively constant for primarily particle associated radionuclides (134,136Cs; 132Te) but that 131I shows much lower local (<80 km) isotope ratios in soils relative to 137Cs. Derived isotope ratios are used to reconstruct external dose rate during the early phase post-accident. Model “blind” tests show more than 95% of predictions within a factor of two of measurements from 15 sites to the north, northwest and west of the power station. It is demonstrated that generic isotope ratios provide a sound basis for reconstruction of early-phase external dose rates in these most contaminated areas.

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Analysis of data from sensitive U.S. monitoring stations for the Fukushima Dai-ichi nuclear reactor accident

Cited by 55 publications

References 3 publications

One-year monitoring of airborne radionuclides in Wako, Japan, after the Fukushima Dai-ichi nuclear power plant accident in 2011

One-year monitoring of airborne radionuclides in Wako, Japan, after the Fukushima Dai-ichi nuclear power plant accident in 2011

Monitoring of atmospheric radionuclides from the Fukushima nuclear accident and assessing their impact on Xi’an, China

Worldwide isotope ratios of the Fukushima release and early-phase external dose reconstruction

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