Radioactive ores DH-1, DL-1, BL-1, BL-2, BL-3 and BL-4 - certified reference materials

Ingles, J C; Sutarno, R; Bowman, W S; Faye, G. H.

doi:10.4095/307160

Cited by 15 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results for the rock standards TML and BL-4 (Tables and 3) provide an indication of the accuracy and reproducibility of our results. The recommended U concentration for uranium ore standard BL-4 is 0.173% (Ingles et al, 1977), in good agreement with our measured value of 0.1714%. The informational value for Th concentration is given as 14 ppm, in general agreement with our more precise value of 12.2 ppm.…”

Section: Quality Checkssupporting

confidence: 90%

A record of uranium-series transport at Nopal I, Sierra Peña Blanca, Mexico: Implications for natural uranium deposits and radioactive waste repositories

et al. 2016

View full text Add to dashboard Cite

Studies of uranium-series (U-series) disequilibria within and around ore deposits provide valuable information on the extent and timing of actinide mobility, via mineral-fluid interaction, over a range of spatial and temporal scales. Such information is useful in studies of analogs of high-level nuclear-waste repositories, as well as for mining and mineral extraction sites, locations of previous nuclear weapons testing, and legacy nuclear waste contamination. In this study we present isotope dilution mass spectrometry U-series measurements for fracture-fill materials (hematite, goethite, kaolinite, calcite, dolomite and quartz) from one such analog; the Nopal I uranium ore deposit situated at Peña Blanca in the Chihuahua region of northern Mexico. The ore deposit is located in fractured, unsaturated volcanic tuff and fracture-fill materials from surface fractures as well as fractures in a vertical drill core have been analyzed. High uranium concentrations in the fracture-fill materials (between 12 and 7700 ppm) indicate uranium mobility and transport from the deposit. Uranium concentrations generally decrease with horizontal distance away from the deposit but in this deposit there is no trend with depth below the surface. Isotopic activity ratios, 238 U-234 U-230 Th-232 Th linear age trends, and U-Th-Pa model ages indicate an actinide mobility evolution that can be characterized as complex and varied. There is evidence of both open and closed system behavior for uranium, depending on both sample and timescale. The 234 U/ 238 U activity ratios indicate U mobility from 1.2-0.2 Ma. In the last 0.2 Ma there is isotopic evidence for some U mobility but mostly U immobility. In almost all cases the Th-Pa radionuclides studied here have been immobile for the past 200 ka. Radium appears to have been recently (0.1-8 ka) mobile due to ongoing fluid flow in the fractures. Overall, the mainly closed system behavior for U-Th-Pa over the past ~200 ka provides an indicator of the geochemical immobility of these actinides over timescales relevant for potential nuclear waste repositories situated in fractured, unsaturated tuff.

show abstract

Section: Quality Checkssupporting

confidence: 90%

A record of uranium-series transport at Nopal I, Sierra Peña Blanca, Mexico: Implications for natural uranium deposits and radioactive waste repositories

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Errors, when quoted, correspond to those reported (7.8) for total thoriums. E Value based on gamma-ray sptrometry (7).…”

Section: Resultsmentioning

confidence: 99%

Determination of Lead‐210, Radium‐226, Thorium‐228 and Uranium‐238 in Five CCRMP Reference Samples by Gamma‐Ray Spectrometry

Joshi

1987

Geostandards Newsletter

View full text Add to dashboard Cite

show abstract

Multielement analysis of uraniferous rocks by INAA: Special reference to interferences due to uranium and fission of uranium

Ila

Jagam

Muecke

1983

J. Radioanal. Chem.

View full text Add to dashboard Cite

Radioactive ores DH-1, DL-1, BL-1, BL-2, BL-3 and BL-4 - certified reference materials

Cited by 15 publications

References 0 publications

A record of uranium-series transport at Nopal I, Sierra Peña Blanca, Mexico: Implications for natural uranium deposits and radioactive waste repositories

A record of uranium-series transport at Nopal I, Sierra Peña Blanca, Mexico: Implications for natural uranium deposits and radioactive waste repositories

Determination of Lead‐210, Radium‐226, Thorium‐228 and Uranium‐238 in Five CCRMP Reference Samples by Gamma‐Ray Spectrometry

Multielement analysis of uraniferous rocks by INAA: Special reference to interferences due to uranium and fission of uranium

Contact Info

Product

Resources

About