Determination of radium isotopes in mine waters through alpha- and beta-activities measured by liquid scintillation spectrometry

Châu, Nguyễn Đình; Niewodniczanski, J.; Dorda, J.; Ochoński, A.; Chruściel, E.; Tomza, I.

doi:10.1007/bf02034249

Cited by 16 publications

(3 citation statements)

References 3 publications

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“…The radium isotopes were precipitated from the water sample of one litter together with barium element as the sulphate compound. Then the obtained sample was cleaned up and separated from the other isotopes using the procedure described by Nguyen et al (1997). The final precipitate was placed in the glass vial 22 ml of capacity and mixed with 12 ml of gel scintillation cocktail produced by Perkin Elmer company and measured using the Į/ȕ 1414 Wallac Liquid Scintillation Counter.…”

Section: Radium Isotopesmentioning

confidence: 99%

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Natural Radioactivity at the Sin Quyen Iron-Oxide-Copper-Gold Deposit in North Vietnam

et al. 2016

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The field radiometric and laboratory measurements were performed at the Sin Quyen copper deposit in North Vietnam. The field gamma-ray spectrometry indicated the concentration of uranium ranging from 5.5 to 87 ppm, thorium from 5.6 to 33.2 ppm, and potassium from 0.3 to 4.7%. The measured dose rates ranged from 115 to 582 nGy/h, the highest doses being at the copper ore. Concentrations in the solid samples were in the range of 20-1700 Bq/kg for uranium, 20-92.7 Bq/kg for thorium, and 7-1345 Bq/kg for potassium. The calculated doses were from 22 to 896 nGy/h; both measured and calculated dose rates are mostly related to uranium. Concentrations of radium in water samples were below 0.17 Bq/L. Uranium in water samples was significantly higher than the hydrogeological background; the maximum of 13 Bq/L was at the waste zone pool, but neither radium nor uranium were present in tap water. Radon concentration in the dwelling air was from 42 to 278 Bq/m 3 for 222 Rn and from 8 to 193 Bq/m 3 for 220 Rn. The estimated committed dose rates D.C. NGUYEN et al. 2306 were principally related to 222 Rn concentration and ranged from 1.1 to 8.1 mSv/y.

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Section: Radium Isotopesmentioning

confidence: 99%

“…The uncertainty of 228 Ra was calculated using the uncertainties of the net count rates measured in both alpha and beta channels as well as the uncertainty of the chemical efficiency. The calculation of the uncertainty for 226 Ra and 228 Ra was described in detail by Nguyen et al (1997).…”

Section: Radium Isotopesmentioning

confidence: 99%

Natural Radioactivity at the Sin Quyen Iron-Oxide-Copper-Gold Deposit in North Vietnam

et al. 2016

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“…The solutions obtained were neutralised with NaOH and radium was precipitated as a sulphate. The prepared precipitates were finally mixed with a scintillation cocktail and their activities measured by the alpha/beta liquid scintillation counter Wallac 1414 ™ (Chau et al 1997). The activity of 137 Cs was determined via the emission peak at 661 keV by high-resolution gamma spectrometry (HPGe, Canberra Gx4020).…”

Section: Study Areamentioning

confidence: 99%

Simultaneous Use of Trace Metals, 210Pb and 137Cs in Floodplain Sediments of a Lowland River as Indicators of Anthropogenic Impacts

Łokas

Wachniew

Ciszewski

et al. 2009

Water Air Soil Pollut

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This study focuses on the distribution of selected trace metals, 137 Cs and 210 Pb, in floodplain deposits of the lowland Warta River (southern Poland) downstream of Częstochowa, a large city with an iron smelter. The depth profiles of trace metal (Zn, Pb, Cu, Ni, Cd and Mn), 210 Pb and 137 Cs contents in floodplain sediments were used to derive deposition rates on the floodplain for the twentieth century. The applicability of particular chronometric tools is considered within the context of their mutual relationships and confirmed by the consistency of the results. Deposition rate estimates for the past 50 years based on the vertical patterns of trace metal concentrations, which were correlated with particular events in the development of the smelter, range from 0.4 cm·year −1 in profiles situated in backswamps far from the channel to over 1.1 cm·year −1 in profiles of the natural levee adjacent to the river. Deposition rates based on 210 Pb inventories in the profiles range from 0.08 to 0.66 g·cm −2 ·year −1 , which corresponds to linear sedimentation rates of 0.10 to 0.91 cm·year −1 , respectively. Dating of characteristic levels associated with peak fallout of 137 Cs gives sediment accretion rates resembling those obtained from trace metals and 210 Pb. The period of the highest sediment accumulation rate could be related to the highest loads of effluent from the iron smelter and city of Często-chowa, which were substantially reduced after the construction of effluent treatment plant.

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Natural radioactivity in bottled natural spring, mineral and therapeutic waters in Poland

Châu

Michalec

2008

J Radioanal Nucl Chem

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Determination of radium isotopes in mine waters through alpha- and beta-activities measured by liquid scintillation spectrometry

Cited by 16 publications

References 3 publications

Natural Radioactivity at the Sin Quyen Iron-Oxide-Copper-Gold Deposit in North Vietnam

Natural Radioactivity at the Sin Quyen Iron-Oxide-Copper-Gold Deposit in North Vietnam

Simultaneous Use of Trace Metals, 210Pb and 137Cs in Floodplain Sediments of a Lowland River as Indicators of Anthropogenic Impacts

Natural radioactivity in bottled natural spring, mineral and therapeutic waters in Poland

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