2011 Fukushima Dai-ichi nuclear power plant accident: summary of regional radioactive deposition monitoring results

Hirose, Katsumi

doi:10.1016/j.jenvrad.2011.09.003

Cited by 321 publications

(137 citation statements)

References 9 publications

(10 reference statements)

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“…A 131 l / 137 Cs activity ratio of about 17.8 was measured in the water discharged directly into the sea from the Fukushima NPP. From the estimated atmospheric releases of 131 I (157 PBq) and 137 Cs (14 PBq), we get a value of 11.2 for the 131 I / 137 Cs activity ratio, which is not far from a median of 15 estimated by Hirose (2012) in precipitation over the Japan. As 131 I and 129 I have similar behavior in the environment, the amount of 129 I directly discharged into the sea can be estimated from the measured 131 I / 137 Cs ratio, and the estimated amount of 137 Cs discharged into the sea.…”

Section: I In Seawater Of the Nw Pacific After The Fukushima Accimentioning

confidence: 73%

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

et al. 2013

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Abstract. Radionuclide impact of the Fukushima Dai-ichi nuclear power plant accident on the distribution of radionuclides in seawater of the NW Pacific Ocean is compared with global fallout from atmospheric tests of nuclear weapons. Surface and water column samples collected during the Ka'imikai-o-Kanaloa (KOK) international expedition carried out in June 2011 were analyzed for 134Cs, 137Cs, 129I and 3H. The 137Cs, 129I and 3H levels in surface seawater offshore Fukushima varied between 0.002–3.5 Bq L−1, 0.01–0.8 μBq L−1, and 0.05–0.15 Bq L−1, respectively. At the sampling site about 40 km from the coast, where all three radionuclides were analyzed, the Fukushima impact on the levels of these three radionuclides represents an increase above the global fallout background by factors of about 1000, 50 and 3, respectively. The water column data indicate that the transport of Fukushima-derived radionuclides downward to the depth of 300 m has already occurred. The observed 137Cs levels in surface waters and in the water column are compared with predictions obtained from the ocean general circulation model, which indicates that the Kuroshio Current acts as a southern boundary for the transport of the radionuclides, which have been transported from the Fukushima coast eastward in the NW Pacific Ocean. The 137Cs inventory in the water column is estimated to be about 2.2 PBq, what can be regarded as a lower limit of the direct liquid discharges into the sea as the seawater sampling was carried out only in the area from 34 to 37° N, and from 142 to 147° E. About 4.6 GBq of 129I was deposited in the NW Pacific Ocean, and 2.4–7 GBq of 129I was directly discharged as liquid wastes into the sea offshore Fukushima. The total amount of 3H released and deposited over the NW Pacific Ocean was estimated to be 0.1–0.5 PBq. These estimations depend, however, on the evaluation of the total 137Cs activities released as liquid wastes directly into the sea, which should improve when more data are available. Due to a suitable residence time in the ocean, Fukushima-derived radionuclides will provide useful tracers for isotope oceanography studies on the transport of water masses during the next decades in the NW Pacific Ocean.

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Section: I In Seawater Of the Nw Pacific After The Fukushima Accimentioning

confidence: 73%

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

et al. 2013

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“…At the time of the East Japan earthquake disaster of March 2011, a large quantity of radioactive material was scattered by the accident at the Fukushima Daiichi nuclear power plant, and workers and inhabitants were exposed to radiation (1)(2)(3). Acute radiation syndrome (ARS) is caused by exposure to a high dose of ionizing radiation within several months (4,5).…”

Section: Introductionmentioning

confidence: 99%

Damage of hair follicle stem cells and alteration of keratin expression in external radiation-induced acute alopecia

Nanashima

Ito

Ishikawa

et al. 2012

International Journal of Molecular Medicine

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Abstract. Alopecia is known as a symptom of acute radiation, yet little is known concerning the mechanism of this phenomenon and the alteration of hair protein profiles. To examine this, 6-week-old male C57/BL6 mice were exposed to 6 Gy of X-ray irradiation, which caused acute alopecia. Their hair and skin were collected, and hair proteins were analyzed with liquid chromatography/electrospray-ionization mass spectrometry and immunohistochemistry. No change was observed in the composition of major hair keratins, such as Krt81, Krt83 and Krt86. However, cytokeratin Krt15 and CD34, which are known as hair follicle stem cell markers, were decreased in alopecic mice. Cytokeratin Krt5, which is known as a marker for basal and undifferentiated keratinocytes, was increased in the epidermis of alopecic mice. These findings suggest that radiation damages hair stem cells and the differentiation of keratinocytes in the epidermis. For the evaluation of radiation exposure, chromosomal aberration is considered to be the gold standard, yet our results suggest that Krt5 may be a novel biological marker for acute radiation symptoms.

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“…Closer to home, DNA damage is also a focus of the US Department of Energy Low Dose Research Program, whose overall goal is to support biological research aimed at assessing risks posed by workplace, waste cleanup, and environmental radiation exposures (2). Such risks are obviously a direct public concern as well, no doubt heightened in the wake of the Fukushima Daiichi nuclear plant incident (3). In PNAS (4), Neumaier et al revisit common imaging-based methods used to assess cellular DNA damage from radiation exposure, and show how standard interpretation of those assays may be flawed.…”

mentioning

confidence: 99%

Double-strand break motions shift radiation risk notions?

Hlatky

2011

Proc. Natl. Acad. Sci. U.S.A.

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2011 Fukushima Dai-ichi nuclear power plant accident: summary of regional radioactive deposition monitoring results

Cited by 321 publications

References 9 publications

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

Damage of hair follicle stem cells and alteration of keratin expression in external radiation-induced acute alopecia

Double-strand break motions shift radiation risk notions?

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