Development and deployment of an underway radioactive cesium monitor off the Japanese coast near Fukushima Dai-ichi

Caffrey, Jarvis A.; Higley, Kathryn A.; Farsoni, Abi T.; Smith, Sean W.; Menn, Scott A.

doi:10.1016/j.jenvrad.2011.12.015

Cited by 26 publications

(7 citation statements)

References 7 publications

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“…After the FNPP accident, real‐time measurement techniques for radioactive Cs were developed (Caffrey et al ., ; Pike et al ., ). Caffrey et al .…”

Section: New Technologies and Techniquesmentioning

confidence: 99%

“…After the FNPP accident, real-time measurement techniques for radioactive Cs were developed (Caffrey et al, 2012;Pike et al, 2012). Caffrey et al (2012) developed an onboard real-time approximation system of the radioactive Cs concentration, enabling recording of occurrences of areas with high radioactive Cs concentrations. The system consists of a NaI(Tl) scintillation detector with a compact digital spectroscope connected to a seawater tank through which a continuous flow of surface seawater is entrained.…”

Section: New Technologies and Techniquesmentioning

confidence: 99%

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Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Kaeriyama

2016

Fisheries Oceanography

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This review summarizes the more than 70 papers published during the 4 years since the Fukushima Dai-ichi nuclear power plant accident that occurred on 11 March 2011, and details the radioactive cesium dispersion pattern in the North Pacific and adjacent seas. The total amount of Fukushima-derived radioactive cesium released into the North Pacific via atmospheric deposition and direct release, spatial and temporal changes in the Pacific coast around the accident site, and the concentration levels of radioactive cesium around the Japanese Islands, not only the Pacific coast but also in adjacent seas, such as Japan Sea, East China Sea are summarized. Based on observational data mostly obtained during 2 years since the accident, and simulation results, oceanic dispersion of radioactive cesium in the entire area of the North Pacific is described. The Fukushima-derived radioactive cesium dispersed eastward as surface water and extended to the eastern side of the North Pacific in 2014, and was also observed via a southward intrusion to subsurface waters as Subtropical Mode Water and Central Mode Water. The radioactive cesium movement related to mode water is important in terms of the circulation of cesium into the ocean interior. Some new technologies and techniques concerning emergency monitoring of radioactivity in the ocean environment are also reported, the effectiveness of which has been demonstrated by use in relation to the Fukushima accident.

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“…After the FNPP accident, real‐time measurement techniques for radioactive Cs were developed (Caffrey et al ., ; Pike et al ., ). Caffrey et al .…”

Section: New Technologies and Techniquesmentioning

confidence: 99%

Section: New Technologies and Techniquesmentioning

confidence: 99%

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Kaeriyama

2016

Fisheries Oceanography

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“…The seawater measurements reported here come from a compilation of monitoring data (Laguionie et al 2012) provided on the Internet by TEPCO (TEPCO 2011), Ministry of Education, Culture, Sports, Science and Technology (MEXT) (MEXT 2011), Fukushima Prefecture, Hokkaido University and already published results (Inoue et al 2012;Buesseler et al 2012;Honda et al 2012;Aoyama et al 2012;Caffrey et al 2012). The database includes 948 significant measurements of 137 Cs activity in seawater (above the detection limit, which varies with time) carried until to 20 July 2011 and the results from more than 7000 seawater samples analysed until May 2012.…”

Section: Cs Seawater Measurementsmentioning

confidence: 99%

Comparison between modelling and measurement of marine dispersion, environmental half-time and 137Cs inventories after the Fukushima Daiichi accident

et al. 2014

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Contamination of the marine environment following the accident at the Fukushima Daiichi nuclear power plant (FDNPP) represents the most important influx of artificial radioactivity released into the sea ever recorded. The evaluation, in near real time, of the total amount of radionuclide released at sea and of the residence time in coastal waters were ones of challenges for nuclear authorities during this event. In the framework of a crisis situation, a numerical hydrodynamical model has been built and used 'as is'. The concomitant use of this numerical model and in situ data allows the comparison of the simulated and measured environmental half-times. A tuning of the wind drag coefficient has been nevertheless necessary to reproduce the evolution of measured inventories of 137 Cs and 134 Cs between April and June 2011. After tuning, the relative mean absolute error between measured and simulated concentrations for the 849 measurements in the dataset is 69 %, while the relative bias indicates a model underestimation of 4 %. These results confirm the estimates of the source term, i.e. 27 PBq (12-41 PBq) for direct releases and 3 PBq for atmospheric deposition onto the sea. The parameters applied here to simulate atmospheric deposition onto the sea are within the correct order of magnitude for reproducing seawater concentrations. Quantitative inventories of tracers which integrate dispersion and transport processes are useful to test model reliability. It exhausts the model sensibility to meteorological forcing, which remains difficult to appraise to reproduce mid-to long-term transport.

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“…The difference of estimated total amounts of the direct release among different studies could be attributed to possible differences in the model configurations and acceptable for better understanding of uncer-tainty of the source information. To reduce the uncertainty, additional studies based on the observation data obtained during the extended period (e.g., Aoyama et al, 2012b;Buesseler et al, 2012;Caffrey et al, 2012;Inoue et al, 2012) could be required as well as additional model simulations (e.g., Dietze and Kriest, 2012).…”

Section: Ocean-mentioning

confidence: 99%

Inverse estimation of source parameters of oceanic radioactivity dispersion models associated with the Fukushima accident

et al. 2013

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With combined use of the ocean–atmosphere simulation models and field observation data, we evaluate the parameters associated with the total caesium-137 amounts of the direct release into the ocean and atmospheric deposition over the western North Pacific caused by the accident of Fukushima Daiichi nuclear power plant (FNPP) that occurred in March 2011. The Green's function approach is adopted for the estimation of two parameters determining the total emission amounts for the period from 12 March to 6 May 2011. It is confirmed that the validity of the estimation depends on the simulation skill near FNPP. The total amount of the direct release is estimated as 5.5–5.9 × 10¹⁵ Bq, while that of the atmospheric deposition is estimated as 5.5–9.7 × 10¹⁵ Bq, which indicates broader range of the estimate than that of the direct release owing to uncertainty of the dispersion widely spread over the western North Pacific

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Development and deployment of an underway radioactive cesium monitor off the Japanese coast near Fukushima Dai-ichi

Cited by 26 publications

References 7 publications

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Comparison between modelling and measurement of marine dispersion, environmental half-time and 137Cs inventories after the Fukushima Daiichi accident

Inverse estimation of source parameters of oceanic radioactivity dispersion models associated with the Fukushima accident

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