Part 1: determination of radioactive disequilibrium in uranium ores by alpha-spectrometry

Killeen, P G; Carmichael, Carol

doi:10.4095/102609

Cited by 3 publications

(3 citation statements)

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Section: Radioactivity Measurements and Dose Calculationsmentioning

confidence: 99%

“…Since there are different elements in 238 U decay series, their reactions may be different in the same environment. For example, the chemical solubilities of radium, uranium, and thorium isotopes differ and differential leaching of isotopes is also another possibility (Killen and Carmicheal, 1976). Equilibrium time is determined by the half-life of the longest-lived isotope in each series, which is 234 U (t 1/2 250,000 years) in the 238 U series and 228 Ra (t 1/2 5.75 years) in the 232 Th series (Dickson et al, 1982).…”

Section: Radioactivity Measurements and Dose Calculationsmentioning

confidence: 99%

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Microtus guentheri (Danford & Alston, 1880) (Rodentia: Cricetidae)as a biomonitor for radionuclides in Mersin Province of Turkey

Yavuz¹,

Özmen²,

Tunç³

et al. 2016

Turk J Zool

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The purpose of this study was to use Microtus guentheri to monitor gamma radioactivity levels in the Mersin region of southern Mediterranean Turkey, where the nation's first nuclear power plant will be built. Prior to our study there was no information available on the radioactivity levels of living organisms in this region. Concentrations of 226 Ra, 232 Th, 40 K, and 137 Cs were determined by gamma spectrometry using a high-purity germanium detector and our results were compared with the associated dose rates in the world. The average value of gamma dose rates obtained in this study (7.59 nGy h -1 ) was in the range of 3.61-20.12 nGy h -1 , which is within the global range of values for soil (10-200 nGy h -1 ). The calculated annual effective dose equivalent with an average value of 9.30 mSv and the radium equivalent activity index with an average value of 15.13 Bq/kg were lower than the worldwide averages for soil of 460 mSv and 370 Bq/kg, respectively. The annual gonadal equivalent dose and excess lifetime cancer risk averaged 386.74 µS/y and 0.93, respectively. There was a strong positive correlation between increasing altitude and 40 K activity (r = 0.996, P < 0.0001). The data presented in this study are baseline data that will be useful in monitoring for fugitive radiation associated with the nuclear power plant planned for the Mersin region.

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Section: Radioactivity Measurements and Dose Calculationsmentioning

confidence: 99%

Section: Radioactivity Measurements and Dose Calculationsmentioning

confidence: 99%

Microtus guentheri (Danford & Alston, 1880) (Rodentia: Cricetidae)as a biomonitor for radionuclides in Mersin Province of Turkey

Yavuz¹,

Özmen²,

Tunç³

et al. 2016

Turk J Zool

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“…The sample powder was deposited from the water suspension onto a polished 22 mm stainless steel disc, evaporated and weighed. This non-destructive method (Jarka, 2007) is a modified procedure of the one described by Killeen and Carmichael (1976). Reference materials CRM 129-A (natural U oxide, isotopic) and BL-5 (U ore) were used.…”

Section: Alpha Spectroscopymentioning

confidence: 99%

Widenmannite, a rare uranyl lead carbonate: occurrence, formation and characterization

et al. 2010

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The rare uranyl lead carbonate widenmannite, Pb2(UO2)(CO3)3, was found at the Jánská vein, Příbram, Czech Republic, where two generations occur in several morphological types and mineral associations in hydrothermal veins. Alpha spectroscopy shows that these two generations have different ages, >220,000 and 118±12 y. ICP-MS analysis indicates that both widenmannites have a dominance of non-radiogenic Pb which originates from weathered galena. The older widenmannite I forms fine-grained, grey to beige aggregates in the highly altered supergene part of the hydrothermal ore vein in association with pyromorphite, cerussite and goethite. The younger widenmannite II occurs as white, yellow or greenish-yellow thin tabular crystals upto 0.5 mm long in association with cerussite, anglesite, limonite, kasolite and an unnamed Pb-U-O phase. Thermal analysis suggests that widenmannite decomposes in several steps, with Pb uranate as the final product. Infrared and Raman spectroscopy confirm the presence of non-equivalent (CO3)2– groups, bidentately coordinated in uranyl hexagonal polyhedra, forming the well known uranyl tricarbonate complex. Infrared spectroscopy shows conclusively that widenmannite does not contain molecular H2O.

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Direct alpha spectrometry as a screening method for assaying thick, highly-radioactive materials

Chichester

Johnson

Miller

2018

J Radioanal Nucl Chem

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Part 1: determination of radioactive disequilibrium in uranium ores by alpha-spectrometry

Cited by 3 publications

References 0 publications

Microtus guentheri (Danford & Alston, 1880) (Rodentia: Cricetidae)as a biomonitor for radionuclides in Mersin Province of Turkey

Microtus guentheri (Danford & Alston, 1880) (Rodentia: Cricetidae)as a biomonitor for radionuclides in Mersin Province of Turkey

Widenmannite, a rare uranyl lead carbonate: occurrence, formation and characterization

Direct alpha spectrometry as a screening method for assaying thick, highly-radioactive materials

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