Gamma radioactivity on a chronosequence, Pinery Provincial Park, Ontario

VandenBygaart, A.J.; Protz, R.

doi:10.4141/cjss95-010

Cited by 23 publications

(14 citation statements)

References 26 publications

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“…This may be a function of two processes: 1) the translocation of clay from the Ae to the Bt , and 2) the redistribution of the 226 Ra and 232 Th that is released from primary minerals, associated with the podzolization process. The podzolization process can occur in association with clay translocation (Buol et al 1980) and the red hues of Bm and Bt horizons can be attributed to secondary Fe oxyhydroxides (Bigham et al 1990;VandenBygaart and Protz 1995b). The surfaces of Fe organo-mineral complexes may be adsorbing the 226 Ra (Nathwani and Phillips 1979;Ames et al 1983;Protz 1995b,1998) and 232 Th (Harmsen and de Haan 1980;Langmuir and Herman 1980;Protz 1995b,1998), and these complexes are translocated from the A horizons and precipitate out of solution in the illuvial Bt horizons as the pH increases (Tate and Theng 1980).…”

Section: Relationship Of Horizonation and Genesis To Natural Radionucmentioning

confidence: 99%

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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: Relationship Of Horizonation and Genesis To Natural Radionucmentioning

confidence: 99%

“…Gamma-emitting radionuclides were measured on a total of 889 samples using a Ge coaxial-type detector (see VandenBygaart and Protz 1995b). The activities of 40 K and 226 Ra were determined from the 1440 keV and 186 keV peaks, respectively.…”

Section: Radionuclide Chemical and Physical Soil Characterization Anmentioning

confidence: 99%

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

VandenBygaart

Protz²,

Mccabe

1999

Can. J. Soil. Sci.

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“…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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“…Here, the iron and aluminium hydroxides will precipitate (along with any radionuclides in the mobile compounds) on larger grains and form surface coatings (Buurman and Jongmans, 2005). Consequently, Vandenbygaart and Protz (1995), Hansen and Huntington (1969) and Hansen and Stout (1968) all found evidence of radionuclide redistribution in podzolised soil profiles.…”

Section: Introductionmentioning

confidence: 99%

“…The lowered concentrations of thorium in the E horizons as observed by Hansen and Huntington (1969) were not found in any of the profiles from this study. Vandenbygaart and Protz (1995) K in three well-developed spodic horizons, and to some extent in two weakly podzolic horizons. The latter observations suggest that radionuclide activity concentrations may be greater in soils with more developed spodic horizons.…”

mentioning

confidence: 99%

The Effects of Holocene Podzolisation on Radionuclide Distributions and Dose Rates in Sandy Coastal Sediments

Nielsen

Murray²

2008

Geochronometria

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This study analyses the effect of a specific kind of soil development, podzolisation, on selected radionuclide concentrations and the derived dose rates. 100 samples from four sandy, podzolised regions in Jutland, Denmark, were dated by luminescence dating. Dose rates were determined by gamma spectrometry. Of the 100 samples, 31 were retrieved from three profiles intersecting soil horizons affected by podzolisation. At 35 locations, additional material was collected for supplementary geochemical analyses (soil pH, organic carbon content and extractable iron and aluminium). The geochemical data and grain size data were correlated with radionuclide activity concentrations. These correlations do not indicate any significant relationship between organic carbon or extractable iron/aluminium and radionuclide concentrations; this suggests that the radionuclides are mainly internally bound in primary minerals, unlike the extractable iron, which is generally associated with surface coatings. We conclude that the radionuclide distribution in these young sandy soils has been relatively unaffected by the podzolisation process. Thus it appears that the dose rate at these sites is unlikely to have changed significantly with time as a result of podzolisation, because the parent material is relatively unweathered and the activity is dominated by internally bound radionuclides.

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Gamma radioactivity on a chronosequence, Pinery Provincial Park, Ontario

Cited by 23 publications

References 26 publications

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

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

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

The Effects of Holocene Podzolisation on Radionuclide Distributions and Dose Rates in Sandy Coastal Sediments

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Gamma radioactivity on a chronosequence, Pinery Provincial Park, Ontario

Cited by 23 publications

References 26 publications

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

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

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

The Effects of Holocene Podzolisation on Radionuclide Distributions and Dose Rates in Sandy Coastal Sediments

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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