The geochemistry of thorium and uranium

Adams, J.A.S.; Osmond, J.K.; Rogers, John J. W.

doi:10.1016/0079-1946(59)90008-4

Cited by 159 publications

(70 citation statements)

References 94 publications

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“…The result agreed with the one obtained by CA and shows a high loading factor for Th and REE in the first factor, while U and K, present low loading factors for both, factor 1 and 2, being negative for U. This results indicates that the mineral bearing Th must be distinct from that bearing U and K. In addition to the uranium-bearing minerals, this element can be present in rocks by isomorphic substitution of calcium [32], what could cause the weak inverse loading factor for these elements in factor 2.…”

Section: Radiological and Elemental Characterizationsupporting

confidence: 81%

Radiological hazard indices and elemental composition of Brazilian and Swiss ornamental rocks

Hajj¹,

Silva²,

Gandolla³

et al. 2017

Braz. J. Rad. Sci.

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Section: Radiological and Elemental Characterizationsupporting

confidence: 81%

Radiological hazard indices and elemental composition of Brazilian and Swiss ornamental rocks

Hajj¹,

Silva²,

Gandolla³

et al. 2017

Braz. J. Rad. Sci.

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“…The activity concentrations of 238U-series and 232Th-series are positively correlated (R 2 = 0.7754) (Fig. 4), which means that the distribution mechanisms of U and Th within the beach sands are more or less the same, due to their similar geochemical characteristics [33]. On the other hand, 40K is negatively correlated with both 238U-and 232Th-series concentrations (R2= 0.5552 and 0.5279 respectively) (Fig.…”

Section: Resultsmentioning

confidence: 79%

Natural radioactivity distribution and gamma radiation exposure of beach sands from Sithonia Peninsula

et al. 2014

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This study aims to evaluate the activity concentrations of 238 U, 226 Ra, 232 Th, 228 Th and 40 K along the beaches of Sithonia Peninsula which are adjacent to the rock-types of the Sithonia Plutonic Complex. These range from 6-673, 5-767, 5-1750, 6-1760 and 185-875 Bq/kg respectively. The (% wt.) heavy magnetic (HM) fraction (epidote, allanite, hornblende, biotite and garnet), the heavy non-magnetic (HNM) fraction (monazite, zircon, titanite and apatite) and the total heavy (TH) fraction, were correlated with the concentrations of the measured radionuclides in the bulk samples. The HNM fraction seems to control the activity concentrations of 238 U in all samples, while the HM fraction, at least for the heavy mineral rich samples bearing high amounts of epidote crystals with allanite cores, controls their 232 Th content. The measured radionuclides in beach sands were normalized to the respective values measured in the granitic rocks, which are their most probable parent rocks, in order to provide data on their enrichment or depletion. The annual effective dose varies from 0.013 to 0.688 mSv y −1 for local people working on the beach, while for tourists the annual external effective dose ranges between 0.003 and 0.165 mSv y −1 . Keywords

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“…The activity concentrations of 238 U-series and 232 Thseries are positively correlated (R 2 = 0.8159) (Fig. 3), which means that the distribution mechanisms of U and Th within the beach sands are more or less the same, due to their similar geochemical characteristics [37]. On the other hand, 40 K is negatively correlated with both 238 Uand 232 Th-series concentrations (R 2 = 0.4046 and 0.4392 respectively) (Fig.…”

Section: Resultsmentioning

confidence: 82%

Natural radioactivity distribution and gammaradiation exposure of beach sands close to Kavalapluton, Greece

et al. 2015

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This study aims to evaluate the activity concentrations of 238 U, 226 Ra, 232 Th, 228 Th and 40 K along the beaches of Kavala being adjacent to the rock-types of the Kavala pluton. These ranged from 14-940, 16-1710, 26-4547, 27-4488 and 194-1307 Bq/kg respectively, representing the highest values of natural radioactivity measured in sediments of Greece. The (%wt.) heavy magnetic (HM) (allanite, amphibole, mica, clinopyroxene, magnetite and hematite) fraction, the heavy non-magnetic (HNM) (monazite, zircon, titanite and apatite) fraction and the total heavy fraction (TH), were correlated with the concentrations of the measured radionuclides in the bulk samples. for local people working on the beach.

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The geochemistry of thorium and uranium

Cited by 159 publications

References 94 publications

Radiological hazard indices and elemental composition of Brazilian and Swiss ornamental rocks

Radiological hazard indices and elemental composition of Brazilian and Swiss ornamental rocks

Natural radioactivity distribution and gamma radiation exposure of beach sands from Sithonia Peninsula

Natural radioactivity distribution and gammaradiation exposure of beach sands close to Kavalapluton, Greece

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