Geochemistry of radium in soils of the Eastern United States

Greeman, Daniel J.; Rose, Arthur W.; Washington, John W.; Dobos, Robert R.; Ciolkosz, Edward J.

doi:10.1016/s0883-2927(98)00059-6

Cited by 68 publications

(39 citation statements)

References 25 publications

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“…Several studies have suggested that 228 Ra and 226 Ra have potential as groundwater source tracers since they have identical chemistries but are from different decay series (King et al 1982;Greeman et al 1999;Eikenberg et al 2001;Tricca et al 2001). As a result, the 228 Ra / 226 Ra ratio in groundwater is a function of the parent isotope ratio ( 232 Th/ 238 U) in the source bedrock.…”

Section: Discussionmentioning

confidence: 99%

Seasonal changes in groundwater input to a well‐mixed estuary estimated using radium isotopes and implications for coastal nutrient budgets

Kelly

Moran

2002

Limnology & Oceanography

162

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Abstract226 Ra (half-life 1,600 yr) and 228 Ra (half-life 5.75 yr) were used as tracers to determine seasonal changes in groundwater input to the Pettaquamscutt estuary from June 1999 to June 2000. Ra isotopes were observed to be in excess of activities due to input from streams, Rhode Island Sound water, and particle desorption. The source of excess 226 Ra and 228 Ra within the estuary is attributed to groundwater transport of Ra derived from the weathering of bedrock within the Pettaquamscutt watershed. Short-lived 224 Ra (half-life 3.66 d) was used to calculate an average residence time of the estuary of 8 Ϯ 4 d. Box models used to constrain seasonal changes in groundwater input to the estuary indicate highest groundwater input in the summer (6.4-20 L m Ϫ2 d Ϫ1 ) and lowest values in the winter (2.1-6.9 L m Ϫ2 d Ϫ1 ). These Ra-derived groundwater fluxes are similar to rates of aquifer recharge over the annual cycle. Using these Ra-derived groundwater fluxes, the input of inorganic nitrogen and phosphorus from groundwater to the Pettaquamscutt was estimated at 61-180 mmol m Ϫ2 yr Ϫ1 and 4.4-13 mmol m Ϫ2 yr Ϫ1, respectively.

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Section: Discussionmentioning

confidence: 99%

Seasonal changes in groundwater input to a well‐mixed estuary estimated using radium isotopes and implications for coastal nutrient budgets

Kelly

Moran

2002

Limnology & Oceanography

162

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“…The highest radon concentrations were measured in the soils of the Frisone Series (typic phase F), located on coarse to fine sediments of the fluvio-lacustrine infilling (mainly in the lowest lake terraces), the recent stream valleys and the alluvial plains, and are characterised by high organic matter content. It is well known that organic substances and phosphates (the latter identified by scanning electron microscopy, see Section 2.2) may adsorb significant amounts of U (Reimann et al, 2003 Table 1, radon values appear to be low along steep slopes, where soils are particularly thin, as a response to erosion, and where the bedrock itself may be exposed at surface; on the contrary, high radon values can be found on flat surfaces (which represent more stable sites in terms of geomorphic dynamics), where soils become thicker and more developed, so that also their capacity of adsorption onto their reactive sites (organic matter, clays and/or iron oxi-hydroxides) becomes higher; coherently, Greeman et al (1999) have highlighted a very high affinity of Rn for organic matter. In addition, these soils generally show highly porous and aerated microstructures (Scarciglia et al, 2005(Scarciglia et al, , 2008, able to trap radon.…”

Section: Discussionmentioning

confidence: 99%

“…The main relationships between natural or anthropogenic radionuclides and their retention/mobility in soils are well documented in the literature (e.g., Greeman et al, 1999;Kabata-Pendias, 2001;Barnett et al, 2002;Reimann et al, 2003). In order to increase the knowledge of the links between radioactivity values and soil features, a designed survey has been carried out in the area around Cecita Lake (Sila Grande, Calabria, Southern Italy).…”

mentioning

confidence: 99%

Natural radioactivity levels (K, Th, U and Rn) in the Cecita Lake area (Sila Massif, Calabria, Southern Italy): An attempt to discover correlations with soil features on a statistical base

Buccianti¹,

Apollaro²,

Bloise³

et al. 2009

Geoderma

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Soils can exhibit a complex range of physical, mineralogical, and chemical features depending on many interrelated factors such as parental rock composition and mineralogy, climate, topography, vegetation amounts and types, water infiltration versus runoff, soil moisture, organic matter, presence and types of anthropogenic contaminants, and many others. Radioactivity as measured on these complex systems is consequently perturbed by several mixed effects. In order to find out a possible (potential) relationship among soil properties and experimental data attributable to radioactivities of K, Th, U and Rn a detailed investigation has been performed in the Cecita Lake basin (Sila Grande, Calabria, Southern Italy). Most of the soil types outcropping in the Cecita Lake surroundings belong to the Entisol and Inceptisol orders [USDA (United States Department of Agriculture), 2006. Keys to Soil Taxonomy. 10th edit., USDA, Soil Survey Staff, Natural Resources Conservation Service, Washington D.C., 333 pp.], representing relatively young, poorly to moderately differentiated soils, showing features strongly dependent on the nature of the parent rock and the climatic conditions. Disintegrations contributed by K, Th, U and Rn measured respectively in % (K), ppm (U and Th) and kBq/m 3 (Rn), have been related to 13 a priori known soil unit groups with well-defined general features and spatial position. The data have been analysed by using graphical and numerical statistical procedures able to manage compositional data in a correct sample space. The paper summarises the results of this research and highlights the conclusions drawn from these investigations, particularly concerning i) the modelling of the high U variability, a behaviour that tends to homogenise the differences potentially attributable to soil features, with the exception of situations where uranium could be enriched due to adsorption onto iron oxi-hydroxides and/or clay minerals or concentrated in argillic horizons due to illuviation; ii) the discovering of the discriminative effect of the K/Th ratio values, particularly for soil groups where Th behaviour, as other tetravalent actinides, is strongly affected by the presence of mineral colloids or where the presence of clays affects the trapping of K; iii) the clustering of the a priori known soil groups in four new sets characterised by internal similarities for Rn values for which the morphology appears to be the most important discriminative effect.

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“…Em geral os solos apresentam valores de radioatividade inferiores aos das rochas, porque, uma vez presente nos solos os radionuclídeos podem ser absorvidos por plantas, ou ter sua concentração lentamente reduzida por processos de lixiviação ROSE, 1996;GREEMAN et al, 1999).…”

Section: Distribuição Do Urânio Rádio E Tório No Solounclassified

“…As principais anomalias de urânio e de tório são originadas a partir de minerais resistentes contendo urânio e tório, compostos insolúveis de tório, e urânio e tório fixados por oxihidróxidos de ferro, alumínio, manganês e argilas, tais anomalias estão situadas no topo do horizonte B latossólico e as de menor intensidade, mas com maior proporção relativa de urânio livre, fixado principalmente por adsorção, distribuem-se pelo corpo deste horizonte (LANGMUIR, 1978;LANGMUIR;HERMAN, 1980 (IYENGAR, 1990;JAWOROWSKI, 1990;GREEMAN et al, 1999).…”

Section: Distribuição Do Urânio Rádio E Tório No Solounclassified

"Um estudo sobre o desequilíbrio radioativo da série do urânio em amostras de solo"

Oliveira¹

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Geochemistry of radium in soils of the Eastern United States

Cited by 68 publications

References 25 publications

Seasonal changes in groundwater input to a well‐mixed estuary estimated using radium isotopes and implications for coastal nutrient budgets

Seasonal changes in groundwater input to a well‐mixed estuary estimated using radium isotopes and implications for coastal nutrient budgets

Natural radioactivity levels (K, Th, U and Rn) in the Cecita Lake area (Sila Massif, Calabria, Southern Italy): An attempt to discover correlations with soil features on a statistical base

"Um estudo sobre o desequilíbrio radioativo da série do urânio em amostras de solo"

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