Anthropogenic radionuclides in the atmosphere observed at Tsukuba: characteristics of the radionuclides derived from Fukushima

Doi, Taeko; Masumoto, K.; Toyoda, Akihiro; Tanaka, Atsushi; Shibata, Yasuyuki; Hirose, Katsumi

doi:10.1016/j.jenvrad.2013.02.001

Cited by 89 publications

(82 citation statements)

References 23 publications

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“…The releasing sources are attributed to a venting operation at an individual reactor vessel, reactor core damage, buildings damaged by a hydrogen explosion, and continuous release through a reactor building (see, e.g., TEPCO 2012; Katata et al 2014). The activity concentrations of these radionuclides were consistent with those described in previous reports regarding Tsukuba (e.g., Doi et al 2013;Kanai 2012 Fig. 8a in the Appendix 1; the details of the measurements are given in Appendix 2.…”

Section: Particulate Fission Products and Radiocssupporting

confidence: 83%

“…The pattern of domestic pollution of the land by local fallout was made fairly clear by the creation of a contamination map based on many university investigations (Kinoshita et al 2011;Tanihata 2013) and airborne surveys by Japan's MEXT and the USA's NASA/DOE (MEXT and USDOE 2011; Sanada et al 2014;Torii et al 2013;USDOE 2013). The transport of the radioactive plume and its subsequent deposition over the capital area (the Kanto Plain; Amano et al 2012;Haba et al 2012;Tsuruta et al 2014) has been reported and monitored in Tsukuba (Doi et al 2013;Kanai 2012). The MRI in Tsukuba suffered almost no electricity outage soon after the earthquake.…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric radioactivity over Tsukuba, Japan: a summary of three years of observations after the FDNPP accident

Igarashi¹,

Kajino²,

Zaizen³

et al. 2015

Prog. in Earth and Planet. Sci.

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The atmospheric data for the 3 years since the accident form a basis for considering temporal changes in the decreasing trends and re-suspension (secondary emission), supporting our understanding of radioCs' atmospheric concentration and deposition. Information regarding our immediate monitoring, modeling, and data analysis approaches for pollution from the FDNPP accident is provided in the Appendices.

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Section: Particulate Fission Products and Radiocssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Atmospheric radioactivity over Tsukuba, Japan: a summary of three years of observations after the FDNPP accident

Igarashi¹,

Kajino²,

Zaizen³

et al. 2015

Prog. in Earth and Planet. Sci.

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“…The soluble form of primary radiocesium is carried by submicron particles (Masson et al 2013), which would most likely be non-sea salt sulfate (nss-SO 4 2− ), as suggested by Doi et al (2013) and Kaneyasu et al (2012). In general, water-soluble cesium ions from SO 4 2− are considered to be adsorbed or attached to mineral particles in a soil environment (Bostic et al 2002;Dumat and Staunton 1999;Mukai et al 2014).…”

Section: Introductionmentioning

confidence: 99%

The seasonal variations of atmospheric 134,137Cs activity and possible host particles for their resuspension in the contaminated areas of Tsushima and Yamakiya, Fukushima, Japan

Kinase

Kita

Igarashi

et al. 2018

Prog Earth Planet Sci

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A large quantity of radionuclides was released by the Fukushima Daiichi Nuclear Power Plant accident in March 2011, and those deposited on ground and vegetation could return to the atmosphere through resuspension processes. Although the resuspension has been proposed to occur with wind blow, biomass burning, ecosystem activities, etc., the dominant process in contaminated areas of Fukushima is not fully understood. We have examined the resuspension process of radiocesium ( 134,137 Cs) based on long-term measurements of the atmospheric concentration of radiocesium activity (the radiocesium concentration) at four sites in the contaminated areas of Fukushima as well as the aerosol characteristic observations by scanning electron microscopy (SEM) and the measurement of the biomass burning tracer, levoglucosan. The radiocesium concentrations at all sites showed a similar seasonal variation: low from winter to early spring and high from late spring to early autumn. In late spring, they showed positive peaks that coincided with the wind speed peaks. However, in summer and autumn, they were correlated positively with atmospheric temperature but negatively with wind speed. These results differed from previous studies based on data at urban sites. The difference of radiocesium concentrations at two sites, which are located within a 1 km range but have different degrees of surface contamination, was large from winter to late spring and small in summer and autumn, indicating that resuspension occurs locally and/or that atmospheric radiocesium was not well mixed in winter/spring, and it was opposite in summer/autumn. These results suggest that the resuspension processes and the host particles of the radiocesium resuspension changed seasonally. The SEM analyses showed that the dominant coarse particles in summer and autumn were organic ones, such as pollen, spores, and microorganisms. Biological activities in forest ecosystems can contribute considerably to the radiocesium resuspension in these seasons. During winter and spring, soil, mineral, and vegetation debris were predominant coarse particles in the atmosphere, and the radiocesium resuspension in these seasons can be attributed to the wind blow of these particles. Any proofs that biomass (Continued on next page)

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“…Four years elapsed and it has now become clear that the radioactive materials have chemical and physical properties concerning chemical forms, particle sizes, shape, phases (gas or aerosol), water solubility, and residence time [6][7][8][9][10]. Adachi et al [11] reported that they directly observed spherical Cs-bearing particles emitted during a relatively early stage (March 14-15) of the accident, and also stated that the spherical Csbearing particles were larger (their diameters were approximately 2 m), and they were less water soluble than sulfate particles.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo Evaluation of Internal Dose and Distribution Imaging Due to Insoluble Radioactive Cs-Bearing Particles of Water Deposited Inside Lungs via Pulmonary Inhalation Using PHITS Code Combined with Voxel Phantom Data

Sakama

Takeda

Matsumoto

et al. 2016

Radiological Issues for Fukushima’s Revitalized Future

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The role of this study in terms of health physics and radiation protection has been implemented to evaluate the internal dose (relative to the committed equivalent dose) and the dose distribution imaging due to gamma rays (photons) and beta particles emitted from the radioactive Cs-bearing particles in atmospheric aerosol dusts deposited in the lungs via pulmonary inhalation. The PHITS code combined with voxel phantom data (DICOM formats) of human lungs was used. We have dealt with the insoluble radioactive Cs-bearing particles of water (about 2.6 m diameter) migrated onto any of six regions, ET1, ET2, BB, AI-bb, LNET, and LNTH, in a respiratory system until dropping into blood vessels. Source parameters were those of an adult male breathing a typical air volume outdoors; in the simulated atmosphere (such as systematically setting up a field) those particles would be released on

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Anthropogenic radionuclides in the atmosphere observed at Tsukuba: characteristics of the radionuclides derived from Fukushima

Cited by 89 publications

References 23 publications

Atmospheric radioactivity over Tsukuba, Japan: a summary of three years of observations after the FDNPP accident

Atmospheric radioactivity over Tsukuba, Japan: a summary of three years of observations after the FDNPP accident

The seasonal variations of atmospheric 134,137Cs activity and possible host particles for their resuspension in the contaminated areas of Tsushima and Yamakiya, Fukushima, Japan

Monte Carlo Evaluation of Internal Dose and Distribution Imaging Due to Insoluble Radioactive Cs-Bearing Particles of Water Deposited Inside Lungs via Pulmonary Inhalation Using PHITS Code Combined with Voxel Phantom Data

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