Isotopic spectroscopy of uranium atomic beams produced by thermal reduction of uranium compounds

Bartlett, Joshua H.; Castro, Alonso

doi:10.1016/j.sab.2019.03.011

Cited by 12 publications

(11 citation statements)

References 17 publications

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“…Natural radiation has permanently been part of the human environment. Its principal mechanisms are cosmogenic radiation and cosmic, terrestrial gamma radiation from natural radionuclides in rocks, soils and sediments and natural radioactive substances in our diet and inhaled air (Bochicchio et al., 1995; Lu and Liu, 2018; Bartlett and Castro, 2019). Radionuclides are found as naturally occurring elements and as products or by-products of nuclear technologies.…”

Section: Introductionmentioning

confidence: 99%

Contamination and risk assessment of heavy metals, and uranium of sediments in two watersheds in Abiete-Toko gold district, Southern Cameroon

Mandeng

Bidjeck

Bessa

et al. 2019

Heliyon

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In this investigation, the level of toxic metals (Cd, Pb, Hg, Cu, Ni, Al, Zn and U) was determined in sediment samples from two watersheds (Kienké and Tchangué) in the Abiete-Toko gold district, southern Cameroon. The potential contamination and toxicity of studied metals was determined by evaluating enrichment factor (EF), geo-accumulation index (Igeo) and ecological risk assessment (ERA). Considering the spatial distribution patterns, metal concentrations were lower than the average shale values, except for Cu and Ni of site 4 in the Kienké watershed and only Ni in the Tchangué watershed. In this study, the EF and Igeo values revealed that sediments were moderately polluted by Ni and Cu and unpolluted by other metals. The evaluation of the ERA based on ecological risk index (RI), ecological risk factor (Er), contamination factor (CF) and pollution load index (PLI) revealed that the sediments from the Abiete-Toko watersheds have significant to very high ecological risk assessment and are generally unpolluted by trace metals and U, except for Ni and Cu. Little quantities of heavy metals with low U levels and distribution were found at the sites close to the vicinity of artisanal mining and peri-urban areas. This proximity reveals that artisanal gold mining activities, agricultural runoff, and other anthropogenic inputs in the study area are probable sources of slight metal contamination. However, the non-use of toxic effluents for gold mining and pesticides for agriculture can be an advantage of the unpolluted status of the watersheds. The physical degradation of the ecosystem through excavations, wells and other stream diversion methods is expanding in the zone. Appropriate measures should be taken by artisans to rehabilitate the gold mining sites, to ensure appropriate treatment of wastewater and non-use of toxic effluents into nearby tributaries.

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Section: Introductionmentioning

confidence: 99%

Contamination and risk assessment of heavy metals, and uranium of sediments in two watersheds in Abiete-Toko gold district, Southern Cameroon

Mandeng

Bidjeck

Bessa

et al. 2019

Heliyon

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“…Chemical reduction could be the solution to this problem, as a reducing agent allows the target atom to be easily liberated from the oxides. 30 The reaction expressed in eqn (2) could proceed in the forward direction when M 2 O 3 is more thermodynamically favourable than Nd 2 O 3 ( i.e. ).Nd 2 O 3 + 2M (reducing agent) → 2Nd + M 2 O 3 …”

Section: Resultsmentioning

confidence: 99%

“…In the present work, erbium and lutetium were employed as candidates for reducing agents due to their negative oxidation potential and lower volatility (, , and at 1800 °C). 30,35,36 Before loading the sample into the crucible, 20 mg of Nd 2 O 3 was evenly blended with erbium and lutetium metals. To examine the performance of the agents, the absorption signal was measured as a function of temperature (Fig.…”

Section: Resultsmentioning

confidence: 99%

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In situ detection of neodymium isotopes using tunable diode laser absorption spectroscopy for nuclear forensic analysis

Choi¹,

Han²,

Yun³

2023

J. Anal. At. Spectrom.

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“…Nuclear non-proliferation testing requires a rapid, field-portable instrument to make an accurate initial assessment of the proportion of enriched uranium. Bartlett and Castro 144 demonstrated the potential for absorption spectroscopy to measure U isotopes. They heated U 3 O 8 or UF 4 with Lu in a Ta crucible and then produced atomic beams of uranium down to enrichment levels of 0.7%.…”

Section: Isotope Analysismentioning

confidence: 99%

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Evans

Pisonero

Smith

et al. 2020

J. Anal. At. Spectrom.

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Isotopic spectroscopy of uranium atomic beams produced by thermal reduction of uranium compounds

Cited by 12 publications

References 17 publications

Contamination and risk assessment of heavy metals, and uranium of sediments in two watersheds in Abiete-Toko gold district, Southern Cameroon

Contamination and risk assessment of heavy metals, and uranium of sediments in two watersheds in Abiete-Toko gold district, Southern Cameroon

In situ detection of neodymium isotopes using tunable diode laser absorption spectroscopy for nuclear forensic analysis

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

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