Radioactivity Distribution of the Fruit Trees Ascribable to Radioactive Fall Out(VI)&amp;mdash;Effect of Heterogeneity of Caesium-137 Concentration in Soil on Transferability to Grape Trees and Fig Trees&amp;mdash;

大輔, 高田; 円理子, 安永; 慶太朗, 田野井

doi:10.3769/radioisotopes.62.533

Cited by 6 publications

(5 citation statements)

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“…The data from Japan compiled from studies following the FDNPP accident were checked to ensure that root uptake of radiocaesium from soil was the main transfer pathway contributing to contamination in fruits. The data from Japan included both field studies and experimental studies [5,12,[30][31][32].…”

Section: Methodsmentioning

confidence: 99%

“…A plant-related factor that has been identified as potentially affecting the radiocaesium content of fruit and the related CR value is the relative position of the absorbing roots compared with that of the deposited radiocaesium [5,31]. Radiocaesium in surface soils may be relatively more bioaccessible to shallow-rooted plants such as herbaceous plants and shrubs.…”

Section: Factors Affecting Fruit Radiocaesium Cr Valuesmentioning

confidence: 99%

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Updated soil to fruit concentration ratios for radiocaesium compiled under the IAEA MODARIA II Programme

Doering¹,

Carini

Sato

et al. 2022

J. Radiol. Prot.

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Under the International Atomic Energy Agency (IAEA) Modelling and Data for Radiological Impact Assessments (MODARIA II) Programme, Working Group 4 activities included collating radionuclide transfer data from Japan following the Fukushima Daiichi Nuclear Power Plant accident and separately collating concentration ratio (CR) data for root uptake of radionuclides by crops grown in tropical and arid climates. In this paper, the newly compiled radiocaesium CR data for fruit from Japan, tropical and arid climates have been combined with the data originally compiled for the IAEA Technical Reports Series No. 472 (TRS 472) and additional data identified from the literature to produce an enhanced MODARIA II dataset of fruit radiocaesium CR values. Statistical analysis of the MODARIA II dataset by climate class (based on the Köppen–Geiger climate classification) indicated that the CR values for tropical climates were significantly higher (p < 0.05) than those for arid, temperate and cold climates. Statistical analysis of the MODARIA II dataset by soil group (based on soil texture) indicated that the CR values for coral sand soil (tropical climates only) and organic soil (temperate climates only) were significantly higher (p < 0.05) than those for the clay, loam and sand soil groups. Statistical analysis of the MODARIA II dataset by plant group (based on plant morphology) indicated that the CR values for non-woody trees (tropical climate bias) were significantly higher (p < 0.05) than those for herbaceous plants, shrubs and woody trees. Comparison of the MODARIA II dataset with original TRS 472 values showed only small changes in the fruit radiocaesium CR values for herbaceous plants and shrubs in temperate climates. There was a decrease in the CR values for woody trees in temperate climate across all soil groups. There was also a decrease in the CR values for tropical climates for all comparable soil groups.

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Section: Methodsmentioning

confidence: 99%

Section: Factors Affecting Fruit Radiocaesium Cr Valuesmentioning

confidence: 99%

Updated soil to fruit concentration ratios for radiocaesium compiled under the IAEA MODARIA II Programme

Doering¹,

Carini

Sato

et al. 2022

J. Radiol. Prot.

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“…Takata et al 12) reported that the transfer rate of 137 Cs in fig (shallow rooted) trees was higher when high concentration of 137 Cs was located in surface soil than in deep soil. Transfer of 137 Cs from soil to fruit is strongly influenced by the relationship between the depth of contaminated soil and the depth of root distribution.…”

Section: Introductionmentioning

confidence: 99%

Transfer Factor of <sup>137</sup>Cs in Several Fruit Tree Species Planted After Radioactive Fallout in Orchard in Fukushima Prefecture and the Effect of Topsoil Management on <sup>137</sup>Cs Concentration in Persimmon Fruits

et al. 2020

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We conducted a 3-to 5-year study of the transfer factors (TF) of 137 Cs in Japanese chestnut, satsuma mandarin and Japanese persimmon trees planted 1 to 2 years after the Fukushima Dai-ichi Nuclear Power Plant accident. The TFs of these fruit trees were on the order of 10 −4 and 10 −3 across the several years and showed annual variations. Comparison of the TFs between two Japanese persimmon cultivars, Hachiya and Hiratanenashi, seemed to be higher TFs values of the fruit and leaves in the former than in the latter cultivar. We further investigated the effect of topsoil management (plowing, topsoil removal, and topsoil return) on 137 Cs concentration in Hachiya fruit and the planted soil. The soil 137 Cs concentration in the topsoil removal treatment was lower than that in the plowing and topsoil return treatments, but the topsoil management had no effect on the 137 Cs concentration of Hachiya fruit in this experiment.

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“…The author's previous study found that radiocesium in soil has almost no relationship with Cs in fruit in most cases. This is because (1) the radiocesium transfer factor (TF) ratio for fruit is lower than annual crops in Japan, (2) trees are no longer affected by fallout which fell directly on bark, and largely contributed to the concentration of radiocesium in the fruit (Takata et al 2012b(Takata et al , 2013a, (3) since radiocesium in the trees remain in situ year after year, this has become a source of radiocesium in fruit (Takata et al 2012d(Takata et al , 2013c, and (4) most kinds of fruit in Fukushima Prefecture (except a few kinds such as blueberries) do not form their rooting zones within 5 cm from surface horizon and thus they do not absorb radiocesium, which was distributed only on the surface horizon unevenly (Takata et al 2013b). The fourth reason is also related to the fact that potassium fertilizer has no effect in most cases.…”

Section: Introductionmentioning

confidence: 99%

The Transition of Radiocesium in Peach Trees After the Fukushima Nuclear Accident

Takata

2019

Agricultural Implications of the Fukushima Nuclear Accident (III)

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In this chapter, we introduce the effects of radiocesium released by the Fukushima Daiichi nuclear accident on fruit trees, especially the change of radiocesium in fruit during the past 6 years. We investigated radiocesium and 40 K in peach during the maturity of its fruit chronologically for 6 years. In the investigation during one crop period, the concentration of radiocesium in young fruit 15 days after the full bloom was the highest, and this result was common in all the investigated years. After that, the concentration of radiocesium decreased as the fruit became bigger; the decrease until 60 days after the full bloom was considerable. This tendency was also common among all investigations conducted until 2016. Though the concentration of 40 K during the same period also decreased in the same way as radiocesium, the rate of the decrease from 15 to 30 days after the full bloom was different. When looking at the chronological transition, the concentration of radiocesium in harvested fruit decreased by one third every year from 2011 to 2013. However, such decrease could not be seen from 2014 to 2016. While the concentration in the harvested fruit tended to stop decreasing, the concentration in fruit 15 days after the full bloom tended to decrease over the years from 2012 to 2016. During the past 6 years, there was no year-over-year decrease in the concentration of 40 K in fruit. The reason why the transition of radiocesium in fruit varied according to their stage of maturity was because the difference in timing to use the tree's nutrient reserves. To understand the year-over-year transition of radiocesium in peach, the amount of 137 Cs in every part of the tree was measured. When comparing the distribution of 137 Cs and 40 K in the peach trees, it was found that 137 Cs was existing in the body of the tree, which was contaminated by fallout, while 40 K was distributed more in the leaves and fruit. Also, while the weight of the trees and the amount of 40 K in the tree body increased with time, the amount of 137 Cs decreased over the years. It is considered that radiocesium stored in the mature woody parts such as stem and branches had been transferred to fruit, leaves, or young branches.

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Radioactivity Distribution of the Fruit Trees Ascribable to Radioactive Fall Out(VI)—Effect of Heterogeneity of Caesium-137 Concentration in Soil on Transferability to Grape Trees and Fig Trees—

Cited by 6 publications

References 5 publications

Updated soil to fruit concentration ratios for radiocaesium compiled under the IAEA MODARIA II Programme

Updated soil to fruit concentration ratios for radiocaesium compiled under the IAEA MODARIA II Programme

Transfer Factor of <sup>137</sup>Cs in Several Fruit Tree Species Planted After Radioactive Fallout in Orchard in Fukushima Prefecture and the Effect of Topsoil Management on <sup>137</sup>Cs Concentration in Persimmon Fruits

The Transition of Radiocesium in Peach Trees After the Fukushima Nuclear Accident

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