Soil to plant transfer of Radium-226

Bettencourt, A.O. de; Teixeira, Margarida; Elias, M.D.T.; Faisca, M.C.

doi:10.1016/0265-931x(88)90067-7

Cited by 44 publications

(25 citation statements)

References 9 publications

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“…Martı´nez-Aguirre et al (1995) reported that Th exhibited a much lower mobility than U, which is consistent with our observations that 232 Th has smaller TF values. The magnitude and range of TFs of 238 U, 226 Ra and 232 Th found in this study appeared to be generally similar to values obtained in other studies where root uptake was the primary mechanism of accumulation (IAEA, 1994;IUR, 1994;Bettencourt et al, 1988;Frissel and Koster, 1988;Ko¨hler et al, 2000).…”

Section: Discussionsupporting

confidence: 90%

“…For example, Ng (1982) reported data ranging from 0.00007 to 0.75 for various plant species. For vegetables growing in areas of high natural radioactivity, TF values were reported from 0.001 to 0.06 by Vasconcellos et al (1987) and from 0.01 to 0.07 by Bettencourt et al (1988). Fig.…”

Section: Ramentioning

confidence: 91%

“…This ratio describes the amount of radionuclide expected to enter a plant from soil. As discussed by Bettencourt et al (1988), factors such as soil characteristics, climatic conditions, type of plants, part of the plant concerned, physico-chemical form of the radionuclides and the interfering element can all influence the TF values. For example, the availability of calcium and potassium in soil for uptake will affect the uranium, thorium and radium content of the plant.…”

Section: Introductionmentioning

confidence: 99%

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Soil to plant transfer of 238U, 226Ra and 232Th on a uranium mining-impacted soil from southeastern China

Chen

Zhu

2005

Journal of Environmental Radioactivity

165

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Section: Discussionsupporting

confidence: 90%

Section: Ramentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Soil to plant transfer of 238U, 226Ra and 232Th on a uranium mining-impacted soil from southeastern China

Chen

Zhu

2005

Journal of Environmental Radioactivity

165

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“…It has been reported that 226 Ra uptake depends on its concentration in the soil, 12) but we observed no correlation between 226 Ra concentrations in soil and brown rice in this study. Similarly, we previously reported no correlation between 226 Ra concentrations in soil and various types of upland field crops possibly due to the inclusion of many crop types, 11) but this hypothesis was found to be untrue; even in one crop, no correlation was found.…”

Section: Ra Concentrations In Soils and Brown Ricecontrasting

confidence: 52%

Transfer of Radium-226 from Soil to Rice: A Comparison of Sampling Area Differences

Uchida¹,

Tagami²

2009

Journal of Nuclear Science and Technology

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Due to limited numbers of radium-226 (226 Ra) soil-to-plant transfer data, it has been difficult to analyze the sampling area differences. In this study, we measured 226 Ra concentrations in brown rice and associated soils collected from 61 locations throughout Japan and obtained soil-to-rice transfer factors (TFs). Concentrations of226 Ra in the soils collected in southwestern Japan were higher than those in northeastern Japan (t-test, p < 0:001); for example, the geometric mean (GM) of 226 Ra in southwestern Japan was 40.4 Bq/kg-dry (N ¼ 33) and it was 27.8 Bq/kg (N ¼ 28) in northeastern Japan, reflecting geological differences between these areas. Using the measured data, we compared TFs in these two areas and found no difference, i.e., the GM in southwest was 4:6 Â 10 À4 and it was 4:9 Â 10 À4 in northeast. The observed TFs were about one order of magnitude lower than the previously reported TF values for cereals (maize, wheat, and rice), but in the same range for previously reported data for white rice. Among the alkaline earth metals, TF for Ba was well correlated to TF for Ra, but because Ba and Ra concentrations in brown rice were highly correlated, the TF would also be expected to correlate.

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“…Po, for example in olive trees, showed their presence in roots, tree trunk and leaves, although the translocation of radionuclides from the root to aerial parts seems to occur in a very limited extent (Table 1 Po, but may vary with soil and plant type (Bettencourt et al, 1988;Carvalho et al, 2009 Pb ratio is about 1 usually (Carvalho, 1995). These results showed the presence of measurable activity concentrations of key uranium daughter radionuclides in common plants.…”

Section: Analyses Of 210mentioning

confidence: 99%

Forest Fires and Resuspension of Radionuclides into the Atmosphere

Carvalho¹,

Oliveira²,

Malta³

2012

American Journal of Environmental Sciences

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Problem statement: Forest fires are especially frequent around the Mediterranean Sea basin in the summer period and might be able to release naturally-occurring and man-made radionuclides from plant biomass and inject them into the atmosphere. The impact of this radioactivity on populations was not investigated before. Approach: Radionuclide analysis was performed in plants, in smoke from plant burning and in cigarette smoke to determine radionuclide concentrations by alpha spectrometry. Results: Concentrations of 210 Pb and 210 Po in trees such as olive trees, showed low concentrations in roots, trunk and leaves and minor translocation of radionuclides from the root to aerial parts. Soil to plant transfer ratios for 210 Po and 210 Pb in several plants were in the range from 10 −4 to 10 −2 . Radionuclides from atmospheric depositions may be accumulated in plants by foliar uptake and for 210 Pb this seems the main pathway, with plant aerial parts displaying 210 Po/ 210 Pb ratios around 0.1, which is similar to the radionuclide ratios determined in atmospheric depositions. Experimental burning of wood from several tree species showed enhanced radionuclide concentrations in smoke compared to plant materials. Investigation of 210 Po release from tobacco leaves used in cigarettes, showed especially enhanced concentrations of this radionuclide in the cigarette smoke particles. Conclusion: Radionuclide concentrations in cigarette smoke expose the lung tissues of regular smokers to high concentrations of 210 Po that were considered carcinogenic. Although radionuclide concentrations in other plants analyzed were generally lower than in tobacco, globally the radionuclide activity in the plant biomass is elevated. Inhaled smoke particles from forest fires are likely to contribute to enhanced radiation doses in the human lung.

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Soil to plant transfer of Radium-226

Cited by 44 publications

References 9 publications

Soil to plant transfer of 238U, 226Ra and 232Th on a uranium mining-impacted soil from southeastern China

Soil to plant transfer of 238U, 226Ra and 232Th on a uranium mining-impacted soil from southeastern China

Transfer of Radium-226 from Soil to Rice: A Comparison of Sampling Area Differences

Forest Fires and Resuspension of Radionuclides into the Atmosphere

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