Influence of geology and soil particle size on the surface-area/volume activity ratio for natural radionuclides

Baeza, A.; Río, M. del; Jiménez, Antonio; Miró, C.; Paniagua, Jesús M.

doi:10.1007/bf02042608

Cited by 57 publications

(26 citation statements)

References 11 publications

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“…Those soils with heavier textures had the greatest background level of activity for 40 K, 226 Ra and 232 Th. This is consistent with findings by other researchers that radioactivity increases as particle size decreases and surface area increases (Megumi et al 1982;de Jong et al 1994;Baeza et al 1995). The influence of the clay content on the radioactivity was further analyzed by regression analysis.…”

Section: Resultssupporting

confidence: 90%

“…The mean activity of 40 K is similar to values for soils in parent materials of Saskatchewan (de Jong et al 1994) but much greater than podzolic soils in the Hudson and James Bay Lowlands (VandenBygaart and Protz 1998). Assuming there is a drop in activity of approximately 67% in the decay of 232 Th to 208 Tl (Kiss et al 1988a) the average 232 Th values are also comparable to Saskatchewan levels (Kiss et al 1988a;de Jong et al 1994) and other areas of the world (Meriwether et al 1988;Baeza et al 1995). The activity of 226 Ra also had a high variability, however, the mean was comparable to lacustrine parent materials, but higher than till parent materials of soils in Saskatchewan (de Jong et al 1994).…”

Section: Resultsmentioning

confidence: 89%

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Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario

VandenBygaart

Protz²,

Mccabe

1999

Can. J. Soil. Sci.

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In Canada and the United States approximately 82% of the annual total dose of radiation to any person comes from terrestrial and cosmogenic sources. The soil is also the main source of radon exposure to humans. Therefore it is important to know the background levels of natural and anthropogenic radioactivity in soils. In this study the radionuclides 40K, 226Ra, 232Th and 137Cs were measured in the soils of southwestern Ontario in order to determine the background levels and to understand the soil profile distribution. Clay content is the most important variable affecting the background levels of 40K, 226Ra, and 232Th in the soil. The profile distribution of these radionuclides is further influenced by pedogenic processes, particularly carbonate leaching from the solum and clay illuviation from the Ae to the Bt horizons. The lateral and vertical distribution of bomb-fallout 137Cs is influenced by soil management such as tillage, biopedoturbation by soil animals such as earthworms and groundhogs, soil erosion and soil organic matter cycling. Multiple regression analysis showed that clay content, sand content, percent CaCO3, pH and organic carbon content had variable influences on each of the radionuclide contents in the soil. Key words: Radionuclides, 40K, 226Ra, 232Th, 137Cs, pedogenesis

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 89%

Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario

VandenBygaart

Protz²,

Mccabe

1999

Can. J. Soil. Sci.

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“…Jasinska et al, 1982;VandenBygaart & Protz, 1995) authors that indicate that radioactivity increases as particle size decreases (Megumi et al, 1982;Baeza et al, 1995). In spite that there is a positive trend in the relationship between clay and 238 U it appears that a larger data set would be necessary to find a significant correlation between them.…”

mentioning

confidence: 98%

Mobility of Natural Radionuclides and Selected Major and Trace Elements Along a Soil Toposequence in the Central Spanish Pyrenees

Izquierdo¹,

Machı́n²,

Soto

2005

Soil Science

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“…The significantly higher values of 40 K in the profiles of Bø-dalen are likely related to differences in mineralogical composition, which can be further confirmed by its sharp depletion in the rich organic layer of PE2. Baeza et al (1995) indicate that radioactivity increases as particle size decreases. In Antarctica, profile increases in clay contents were paralleled with ERN enrichments (Navas et al, 2005a).…”

Section: Discussionmentioning

confidence: 96%

“…As it is widely known in the literature (e.g. Jasinska et al, 1982, Baeza et al, 1995, VandenBygaart and Protz, 1995, the environmental radionuclides are associated with clay minerals or they are fixed within the lattice structure. The significantly higher values of 40 K in the profiles of Bø-dalen are likely related to differences in mineralogical composition, which can be further confirmed by its sharp depletion in the rich organic layer of PE2.…”

Section: Discussionmentioning

confidence: 99%

Variations of soil profile characteristics due to varying time spans since ice retreat in the inner Nordfjord, western Norway

et al. 2014

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Abstract. In the Erdalen and Bødalen drainage basins located in the inner Nordfjord in western Norway the soils were formed after deglaciation. The climate in the uppermost valley areas is sub-arctic oceanic, and the lithology consists of Precambrian granitic orthogneisses on which Leptosols and Regosols are the most common soils. The Little Ice Age glacier advance affected parts of the valleys with the maximum glacier extent around AD 1750. In this study five sites on moraine and colluvium materials were selected to examine main soil properties, grain size distribution, soil organic carbon and pH to assess if soil profile characteristics and patterns of fallout radionuclides (FRNs) and environmental radionuclides (ERNs) are affected by different stages of ice retreat. The Leptosols on the moraines are shallow, poorly developed and vegetated with moss and small birches. The two selected profiles show different radionuclide activities and grain size distribution. The sampled soils on the colluviums outside the LIA glacier limit became ice-free during the Preboral. The Regosols present better-developed profiles, thicker organic horizons and are fully covered by grasses. Activity of 137 Cs and 210 Pb ex concentrate at the topsoil and decrease sharply with depth. The grain size distribution of these soils also reflects the difference in geomorphic processes that have affected the colluvium sites. Significantly lower mass activities of FRNs were found in soils on the moraines than on colluviums. Variations of ERN activities in the valleys were related to characteristics of soil mineralogical composition. These results indicate differences in soil development that are consistent with the age of ice retreat. In addition, the pattern distribution of 137 Cs and 210 Pb ex activities differs in the soils related to the LIA glacier limits in the drainage basins.

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Influence of geology and soil particle size on the surface-area/volume activity ratio for natural radionuclides

Cited by 57 publications

References 11 publications

Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario

Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario

Mobility of Natural Radionuclides and Selected Major and Trace Elements Along a Soil Toposequence in the Central Spanish Pyrenees

Variations of soil profile characteristics due to varying time spans since ice retreat in the inner Nordfjord, western Norway

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Influence of geology and soil particle size on the surface-area/volume activity ratio for natural radionuclides

Cited by 57 publications

References 11 publications

Distribution of natural radionuclides and 137Cs in soils of southwestern Ontario

Distribution of natural radionuclides and 137Cs in soils of southwestern Ontario

Mobility of Natural Radionuclides and Selected Major and Trace Elements Along a Soil Toposequence in the Central Spanish Pyrenees

Variations of soil profile characteristics due to varying time spans since ice retreat in the inner Nordfjord, western Norway

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Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario

Distribution of natural radionuclides and ¹³⁷Cs in soils of southwestern Ontario