Radium isotope fingerprinting of permafrost ‐ applications to thawing and intra‐permafrost processes

2019 ◽  
Vol 30 (2) ◽  
pp. 104-112
Author(s):  
Yishai Weinstein ◽  
Dotan Rotem ◽  
Henk Kooi ◽  
Yoseph Yechieli ◽  
Jurgen Sültenfuß ◽  
...  
Keyword(s):  
Radium Isotope

Near-field hydrothermal plume dynamics at Brothers Volcano (Kermadec Arc): A short-lived radium isotope study

2020 ◽  
Vol 533 ◽  
pp. 119379 ◽  
Author(s):  
René Neuholz ◽  
Bernhard Schnetger ◽  
Charlotte Kleint ◽  
Andrea Koschinsky ◽  
Karsten Lettmann ◽  
...  
Keyword(s):  
Near Field ◽  
Radium Isotope ◽  
Hydrothermal Plume ◽  
Plume Dynamics ◽  
Isotope Study

Determination of low-level Radium isotope activities in fresh waters by gamma spectrometry

2017 ◽  
Vol 120 ◽  
pp. 119-125 ◽  
Author(s):  
Arnold Molina Porras ◽  
Michel Condomines ◽  
Jean Luc Seidel
Keyword(s):  
Gamma Spectrometry ◽  
Radium Isotope ◽  
Low Level ◽  
Fresh Waters

Simultaneous Determination of 226Ra and 228Ra in Water by Liquid Scintillation Spectrometry

2011 ◽  
Vol 64 (7) ◽  
pp. 880 ◽  
Author(s):  
M. Cook ◽  
R. Kleinschmidt
Keyword(s):  
Liquid Scintillation ◽  
Isotope Analysis ◽  
Earth Metal ◽  
Standard Reference Materials ◽  
Liquid Scintillation Spectrometry ◽  
Radium Isotope ◽  
Low Concentrations ◽  
Water Plants ◽  
Co Precipitation ◽  
Lead 210

Radium is a naturally occurring alkaline earth metal that is present in soils, water, plants, and foods in low concentrations. In the analysis of radium in trace amounts, co-precipitation is the favoured way of separating an element from its matrix. In this case, radium is co-precipitated with barium. The purity and yield of the extraction is controlled by adsorption onto the barium sulfate precipitate and pH manipulation controls the solubility of certain products. This technique enables the removal of interfering lead-210 to yield a purified radium source for analysis, which is done using liquid scintillation spectrometry. The analytical results of spiked water samples are in good agreement with the known activities of radium-226 and radium-228 standard reference materials. Minimum detectable limits for radium-226 and radium-228 are calculated to be 0.01 and 0.06 Bq L–1, respectively. The method provides a fast, reliable, and accurate alternative to traditional radium isotope analysis based on α and gamma spectrometry.

Evaluation of submarine groundwater discharge into the northern Bohai Bay, China using 226Ra

2015 ◽  
Vol 16 (2) ◽  
pp. 362-368 ◽  
Author(s):  
Xuejing Wang ◽  
Hailong Li ◽  
Yan Zhang ◽  
Chaoyue Wang ◽  
Wenjing Qu ◽  
...  
Keyword(s):  
Mass Balance ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Balance Model ◽  
Return Flow ◽  
Bohai Bay ◽  
Mass Balance Model ◽  
Material Transport ◽  
Radium Isotope ◽  
Submarine Groundwater

Submarine groundwater discharge (SGD) has been widely recognized as a significant source of water and dissolved material transport from land to ocean. To quantify SGD into the northern Bohai Bay, China, naturally occurring radium isotope (226Ra) was measured in water samples collected along two transects in September 2012. Based on a tidal prism model, two different flushing times of the coastal water were determined to be 9.1 d and 11.5 d with respect to the different return flow factor (b) obtained from a physical model and a mass balance model of 226Ra and salinity, respectively. Using the derived flushing time, we developed a 226Ra mass balance model to estimate the SGD into the bay, which includes mixing, sedimentary input and SGD. The 226Ra budget indicated the 226Ra input from SGD accounted for 99% of the total tracer input to the northern Bohai Bay. We arrived at an average flux from SGD of 4.83 × 107 m3/d. The large volume of SGD confirms its importance in supplying a considerable quantity of nutrients to the bay.

scholarly journals Use of radium isotopes to estimate mixing rates and trace sediment inputs to surface waters in northern Marguerite Bay, Antarctic Peninsula

2012 ◽  
Vol 25 (3) ◽  
pp. 445-456 ◽  
Author(s):  
Amber L. Annett ◽  
Sian F. Henley ◽  
Pieter Van Beek ◽  
Marc Souhaut ◽  
Raja Ganeshram ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Antarctic Peninsula ◽  
Eddy Diffusivity ◽  
Radium Isotope ◽  
Radium Isotopes ◽  
Simple Diffusion ◽  
Marguerite Bay ◽  
Coastal Embayment ◽  
Mixing Rates ◽  
Simple Diffusion Model

AbstractIn the western Antarctic Peninsula region, micronutrient injection facilitates strong plankton blooms that support productive food webs, unlike large areas of the low-productivity Southern Ocean. We use naturally occurring radioisotopes of radium to constrain rates of chemical fluxes into Ryder Bay (a small coastal embayment in northern Marguerite Bay), and hence to evaluate possible sources of sediment-derived micronutrients and estimate sediment-ocean mixing rates. We present the first coupled, short-lived radium isotope (223Ra and 224Ra) measurements from Antarctic waters, both present at very low activities (mean 0.155 and 3.21 dpm m-3, respectively), indicating much lower radium inputs than in other coastal environments. Longer-lived 228Ra activity was also lower than existing nearshore values, but higher than open ocean waters, indicating some degree of coastal radium input on timescales exceeding the week-to-month range reflected by 223Ra and 224Ra. Using a simple diffusion model along a shore to mid-bay transect, effective horizontal eddy diffusivity estimates ranged from 0.22–0.83 m2 s-1 from 223Ra and 224Ra, respectively, much lower than already-low mixing estimates for the Southern Ocean. Significant radium enrichment and much faster mixing (18 m2 s-1) was found near a marine-terminating glacier and consequently any sediment-derived micronutrient inputs in this location are more probably dominated by glacial processes than groundwater, land runoff, or marine sediment sources.

NORM Survey in Argentina

2012 ◽  
Vol 41 (3-4) ◽  
pp. 352-367
Author(s):  
A.C. Canoba
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Radioactive Material ◽  
Geothermal Waters ◽  
Radium Isotope ◽  
Gas Industry ◽  
Naturally Occurring ◽  
Remedial Actions ◽  
Naturally Occurring Radioactive Material ◽  
Almost All

A survey programme was initiated several years ago with the aim of estimating the incidence of naturally occurring radioactive material (NORM) exposure for workers in the oil and gas industry, gold mining, spas, and a tourist cavern in Argentina. This work presents the procedures, methods employed, and results to date from the survey, including protection and remedial actions recommended when deemed necessary. Radium isotope concentrations measured in some samples were well above the exemption values established by IAEA Standards. Elevated radon levels (above the action level established for workplaces) were detected in the gas facilities, the gold mine, and the tourist cavern. The pertinent authorities and the facilities were informed of the detected values in order to take actions to reduce concentrations. In terms of the spas, almost all values for geothermal waters were below the corresponding guidance levels. Some regulatory aspects for the management of NORM are suggested.

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