Recent Tritium Concentration of Monthly Precipitation in Japan

Nakasone, Shunya; Ishimine, Akinobu; Ishizu, Yuji; Shiroma, Yoshitaka; Tanaka, Masahiro; Kakiuchi, Hideki; Sanada, Tetsuya; Furukawa, Mutsuhisa

doi:10.1093/rpd/ncz087

Cited by 13 publications

(9 citation statements)

References 8 publications

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“…Annual tritium concentrations (arithmetic mean ± standard deviation) in 2014, 2015, 2016, and 2017 were 0.35 ± 0.14, 0.30 ± 0.08, 0.30 ± 0.13, and 0.32 ± 0.13 Bq L −1 . Recent data for tritium concentration in monthly precipitation in Japan have been summarized [9,24,25]. It is known that the concentration of environmental tritium depends on the latitude of the sampling location; it is high at northern latitudes and low at southern latitudes [26,27].…”

Section: Resultsmentioning

confidence: 99%

“…It is known that the concentration of environmental tritium depends on the latitude of the sampling location; it is high at northern latitudes and low at southern latitudes [26,27]. For example, tritium concentration in monthly precipitation in Sapporo (northern Japan) during July 2015 to December 2017 ranged from 0.24 to 1.27 Bq L −1 [9], that of Rokkasho during April 2001 to March 2006 ranged from 0.16 to 1.23 Bq L −1 [28], that of Chiba during November 2013 to December 2017 ranged from 0.12 to 0.53 Bq L −1 [24], and that of Okinawa (southern Japan) during June 2014 to December 2017 ranged from 0.05 to 0.27 Bq L −1 [9]. The results of the present study were similar to those of Chiba, which is at a similar latitude.…”

Section: Resultsmentioning

confidence: 99%

“…After the Chernobyl Nuclear Power Plant accident and the Fukushima Dai-ichi Nuclear Power Plant accident, elevated tritium in environmental samples was observed [7,8]. In the case of Japan, Nakasone et al [9] concluded that tritium concentrations in monthly precipitation were increased by nuclear weapon testing and the Fukushima Dai-ichi Nuclear Power Plant accident. In the future, nuclear fusion reactors will have a large inventory of tritium as fuel.…”

Section: Introductionmentioning

confidence: 99%

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Isotope Composition and Chemical Species of Monthly Precipitation Collected at the Site of a Fusion Test Facility in Japan

Tanaka

Iwata

Kato

et al. 2019

IJERPH

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The deuterium plasma experiment was started using the Large Helical Device (LHD) at the National Institute for Fusion Science (NIFS) in March 2017 to investigate high-temperature plasma physics and the hydrogen isotope effects towards the realization of fusion energy. In order to clarify any experimental impacts on precipitation, precipitation has been collected at the NIFS site since November 2013 as a means to assess the relationship between isotope composition and chemical species in precipitation containing tritium. The tritium concentration ranged from 0.10 to 0.61 Bq L−1 and was high in spring and low in summer. The stable isotope composition and the chemical species were unchanged before and after the deuterium plasma experiment. Additionally, the tritium concentration after starting the deuterium plasma experiment was within three sigma of the average tritium concentration before the deuterium plasma experiment. These results suggested that there was no impact by tritium on the environment surrounding the fusion test facility.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isotope Composition and Chemical Species of Monthly Precipitation Collected at the Site of a Fusion Test Facility in Japan

Tanaka

Iwata

Kato

et al. 2019

IJERPH

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“…The 3 H activity concentrations in these two rivers decreased gradually to approximately 300-500 Bq m −3 in 2019, which indicates that the 3 H activity concentration in underground water might also have decreased to a pre-accident 3 H level without any effect from the FNPP1 accident. Nakasone et al (Nakasone et al, 2019) reported 3 H in the monthly precipitation samples collected in Hokkaido, Gifu, and Okinawa Prefectures between June 2014 and December 2017. The arithmetic mean of the 3 H 285 concentrations in the collected precipitation samples for the period from June 2014 and December 2017 at Hokkaido, Gifu, and Okinawa were estimated to be 620 ± 270 Bq m −3 , 302 ± 120 Bq m −3 , and 130 ± 50 Bq m −3 , respectively.…”

Section: H Activity Concentrations In River Water and Precipitationmentioning

confidence: 99%

Comment on bg-2021-10

2021

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We observed 3 H activity concentrations and the 137 Cs activity concentrations during the SoSo 5 rivers cruise in 2014 and at the Tomioka port in 2014-2018. The 3 H activity concentrations at coastal stations located close to the Fukushima coast ranged from 90 Bq m -3 to 175 Bq m -3 , and decreased between 67 Bq m -3 to 83 Bq m -3 at the stations located 12-16 km from the coast. The 3 H activity concentration at 20 the estuaries and ports, except at 56 north canal of the FNPP1 site, are around 200-500 Bq m -3 and slightly lower than the 3 H activity concentration of 500-600 Bq m -3 observed in the rivers. These gradients of the 3 H activity concentrations in the coastal region might indicate the large effect of 3 H flux through the rivers.On the other hand, the 3 H activity concentration at 56N of the FNPP1 site was significantly high compared to the 3 H activity concentration in surrounding waters both north and south of the FNPP1 site and in river 25 waters. It should also be noted that the 3 H activity concentrations were similar at the stations located both north and south of the FNPP1 site, while the 137 Cs activity concentrations were lower at the stations north

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“…The tritium concentration in precipitation is monitored all over the world [3,[13][14][15], and some reports specifically for Japan have appeared [12,[16][17][18][19]. In addition, there are some reports providing tritium concentrations with chemical and stable isotope compositions to clarify the regional properties in Japan [16,17].…”

Section: Introductionmentioning

confidence: 99%

Monthly Precipitation Collected at Hirosaki, Japan: Its Tritium Concentration and Chemical and Stable Isotope Compositions

et al. 2022

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Monthly precipitation samples were collected at Hirosaki, Aomori Prefecture from January 2018 to December 2020 to measure the ion species and stable hydrogen and oxygen isotope ratios in order to understand the regional properties. The tritium concentration ranged from 0.28 to 1.20 Bq/L, with mean values (±S.D.) of 0.52 ± 0.18, 0.67 ± 0.25 and 0.63 ± 0.21 Bq/L in 2018, 2019 and 2020, respectively. This concentration level was almost the same as for Rokkasho, Aomori Prefecture. The tritium concentration had clear seasonal variation: high in the spring and low in the summer. This trend was thought to arise from seasonal fluctuations in the atmospheric circulation. On the other hand, the pH tended to be low, and the electrical conductivity (EC) tended to be high from the winter to the spring. The ion components, which major ion species contained in sea salt, also tended to be high in the winter, and these components had a strong influence on EC. The d-excess values were high in the winter and low in the summer, and when this trend was considered from the viewpoint of the wind direction data in Hirosaki, these dust components were attributed to the northwest monsoon in the winter to the spring coming from the Asian continent.

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Recent Tritium Concentration of Monthly Precipitation in Japan

Cited by 13 publications

References 8 publications

Isotope Composition and Chemical Species of Monthly Precipitation Collected at the Site of a Fusion Test Facility in Japan

Isotope Composition and Chemical Species of Monthly Precipitation Collected at the Site of a Fusion Test Facility in Japan

Comment on bg-2021-10

Monthly Precipitation Collected at Hirosaki, Japan: Its Tritium Concentration and Chemical and Stable Isotope Compositions

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