The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
J. L. Reyss - One of the best experts on this subject based on the ideXlab platform.
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Measuring the radium quartet (228Ra, 226Ra, 224Ra, 223Ra) in seawater samples using Gamma Spectrometry.
Journal of environmental radioactivity, 2010Co-Authors: P. Van Beek, Marc Souhaut, J. L. ReyssAbstract:Radium isotopes are widely used in marine studies (eg. to trace water masses, to quantify mixing processes or to study submarine groundwater discharge). While 228Ra and 226Ra are usually measured using Gamma Spectrometry, short-lived Ra isotopes (224Ra and 223Ra) are usually measured using a Radium Delayed Coincidence Counter (RaDeCC). Here we show that the four radium isotopes can be analyzed using Gamma Spectrometry. We report 226Ra, 228Ra, 224Ra, 223Ra activities measured using low-background Gamma Spectrometry in standard samples, in water samples collected in the vicinity of our laboratory (La Palme and Vaccares lagoons, France) but also in seawater samples collected in the plume of the Amazon river, off French Guyana (AMANDES project). The 223Ra and 224Ra activities determined in these samples using Gamma Spectrometry were compared to the activities determined using RaDeCC. Activities determined using the two techniques are in good agreement. Uncertainties associated with the 224Ra activities are similar for the two techniques. RaDeCC is more sensitive for the detection of low 223Ra activities. Gamma Spectrometry thus constitutes an alternate method for the determination of short-lived Ra isotopes.
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Measuring the radium quartet (Ra-228, Ra-226, Ra-224, Ra-223) in seawater samples using Gamma Spectrometry
Journal of Environmental Radioactivity, 2010Co-Authors: P. Van Beek, Marc Souhaut, J. L. ReyssAbstract:Radium isotopes are widely used in marine studies (eg. to trace water masses, to quantify mixing processes or to study submarine groundwater discharge). While Ra-228 and Ra-228 are usually measured using Gamma Spectrometry, short-lived Ra isotopes (Ra-224 and Ra-223) are usually measured using a Radium Delayed Coincidence Counter (RaDeCC). Here we show that the four radium isotopes can be Ra-228 Ra-224 223 analyzed using Gamma Spectrometry. We report Ra-226 Ra activities measured using low-background Gamma Spectrometry in standard samples, in water samples collected in the vicinity of our laboratory (La Palme and Vaccares lagoons, France) but also in seawater samples collected in the plume of the Amazon river, off French Guyana (AMANDES project). The Ra-223 and Ra-224 activities determined in these samples using Gamma Spectrometry were compared to the activities determined using RaDeCC. Activities determined using the two techniques are in good agreement. Uncertainties associated with the Ra-224 activities are similar for the two techniques. RaDeCC is more sensitive for the detection of low Ra-223 activities. Gamma Spectrometry thus constitutes an alternate method for the determination of short-lived Ra isotopes. (C) 2009 Elsevier Ltd. All rights reserved.
P. Van Beek - One of the best experts on this subject based on the ideXlab platform.
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Measuring the radium quartet (228Ra, 226Ra, 224Ra, 223Ra) in seawater samples using Gamma Spectrometry.
Journal of environmental radioactivity, 2010Co-Authors: P. Van Beek, Marc Souhaut, J. L. ReyssAbstract:Radium isotopes are widely used in marine studies (eg. to trace water masses, to quantify mixing processes or to study submarine groundwater discharge). While 228Ra and 226Ra are usually measured using Gamma Spectrometry, short-lived Ra isotopes (224Ra and 223Ra) are usually measured using a Radium Delayed Coincidence Counter (RaDeCC). Here we show that the four radium isotopes can be analyzed using Gamma Spectrometry. We report 226Ra, 228Ra, 224Ra, 223Ra activities measured using low-background Gamma Spectrometry in standard samples, in water samples collected in the vicinity of our laboratory (La Palme and Vaccares lagoons, France) but also in seawater samples collected in the plume of the Amazon river, off French Guyana (AMANDES project). The 223Ra and 224Ra activities determined in these samples using Gamma Spectrometry were compared to the activities determined using RaDeCC. Activities determined using the two techniques are in good agreement. Uncertainties associated with the 224Ra activities are similar for the two techniques. RaDeCC is more sensitive for the detection of low 223Ra activities. Gamma Spectrometry thus constitutes an alternate method for the determination of short-lived Ra isotopes.
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Measuring the radium quartet (Ra-228, Ra-226, Ra-224, Ra-223) in seawater samples using Gamma Spectrometry
Journal of Environmental Radioactivity, 2010Co-Authors: P. Van Beek, Marc Souhaut, J. L. ReyssAbstract:Radium isotopes are widely used in marine studies (eg. to trace water masses, to quantify mixing processes or to study submarine groundwater discharge). While Ra-228 and Ra-228 are usually measured using Gamma Spectrometry, short-lived Ra isotopes (Ra-224 and Ra-223) are usually measured using a Radium Delayed Coincidence Counter (RaDeCC). Here we show that the four radium isotopes can be Ra-228 Ra-224 223 analyzed using Gamma Spectrometry. We report Ra-226 Ra activities measured using low-background Gamma Spectrometry in standard samples, in water samples collected in the vicinity of our laboratory (La Palme and Vaccares lagoons, France) but also in seawater samples collected in the plume of the Amazon river, off French Guyana (AMANDES project). The Ra-223 and Ra-224 activities determined in these samples using Gamma Spectrometry were compared to the activities determined using RaDeCC. Activities determined using the two techniques are in good agreement. Uncertainties associated with the Ra-224 activities are similar for the two techniques. RaDeCC is more sensitive for the detection of low Ra-223 activities. Gamma Spectrometry thus constitutes an alternate method for the determination of short-lived Ra isotopes. (C) 2009 Elsevier Ltd. All rights reserved.
Marc Souhaut - One of the best experts on this subject based on the ideXlab platform.
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Measuring the radium quartet (228Ra, 226Ra, 224Ra, 223Ra) in seawater samples using Gamma Spectrometry.
Journal of environmental radioactivity, 2010Co-Authors: P. Van Beek, Marc Souhaut, J. L. ReyssAbstract:Radium isotopes are widely used in marine studies (eg. to trace water masses, to quantify mixing processes or to study submarine groundwater discharge). While 228Ra and 226Ra are usually measured using Gamma Spectrometry, short-lived Ra isotopes (224Ra and 223Ra) are usually measured using a Radium Delayed Coincidence Counter (RaDeCC). Here we show that the four radium isotopes can be analyzed using Gamma Spectrometry. We report 226Ra, 228Ra, 224Ra, 223Ra activities measured using low-background Gamma Spectrometry in standard samples, in water samples collected in the vicinity of our laboratory (La Palme and Vaccares lagoons, France) but also in seawater samples collected in the plume of the Amazon river, off French Guyana (AMANDES project). The 223Ra and 224Ra activities determined in these samples using Gamma Spectrometry were compared to the activities determined using RaDeCC. Activities determined using the two techniques are in good agreement. Uncertainties associated with the 224Ra activities are similar for the two techniques. RaDeCC is more sensitive for the detection of low 223Ra activities. Gamma Spectrometry thus constitutes an alternate method for the determination of short-lived Ra isotopes.
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Measuring the radium quartet (Ra-228, Ra-226, Ra-224, Ra-223) in seawater samples using Gamma Spectrometry
Journal of Environmental Radioactivity, 2010Co-Authors: P. Van Beek, Marc Souhaut, J. L. ReyssAbstract:Radium isotopes are widely used in marine studies (eg. to trace water masses, to quantify mixing processes or to study submarine groundwater discharge). While Ra-228 and Ra-228 are usually measured using Gamma Spectrometry, short-lived Ra isotopes (Ra-224 and Ra-223) are usually measured using a Radium Delayed Coincidence Counter (RaDeCC). Here we show that the four radium isotopes can be Ra-228 Ra-224 223 analyzed using Gamma Spectrometry. We report Ra-226 Ra activities measured using low-background Gamma Spectrometry in standard samples, in water samples collected in the vicinity of our laboratory (La Palme and Vaccares lagoons, France) but also in seawater samples collected in the plume of the Amazon river, off French Guyana (AMANDES project). The Ra-223 and Ra-224 activities determined in these samples using Gamma Spectrometry were compared to the activities determined using RaDeCC. Activities determined using the two techniques are in good agreement. Uncertainties associated with the Ra-224 activities are similar for the two techniques. RaDeCC is more sensitive for the detection of low Ra-223 activities. Gamma Spectrometry thus constitutes an alternate method for the determination of short-lived Ra isotopes. (C) 2009 Elsevier Ltd. All rights reserved.
A. Fazio - One of the best experts on this subject based on the ideXlab platform.
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InSiCal - A tool for calculating calibration factors and activity concentrations in in situ Gamma Spectrometry.
Journal of environmental radioactivity, 2017Co-Authors: Alexander Mauring, Tim Vidmar, Torbjörn Gäfvert, Jon Drefvelin, A. FazioAbstract:In situ Gamma Spectrometry is a widely applied analysis technique for the determination of radioactivity levels in soil. Compared to traditional laboratory analysis of soil samples, in situ techniques offer a quick and low-cost way of obtaining accurate results from on-site measurements. However, although the technique is well-known, the dependence of in situ Gamma Spectrometry on complex and time-consuming calibration procedures as well as in-depth knowledge of the geometric distribution of the source in the ground deters many potential users from employing it in their routine work. Aiming to alleviate this issue, a software tool named InSiCal (In Situ Gamma Spectrometry Calculator) has been developed to make in situ Gamma Spectrometry more accessible to both experts and non-experts in the field. This is done by simplifying and streamlining both calibration and activity calculation through a simple and intuitive graphical user interface. Testing in real field conditions show that InSiCal is capable of yielding results which are in very good agreement with soil sample analyses, and that the results may be obtained using different detector types (HPGe, NaI, LaBr and CZT). Overall, InSiCal, provides results which are comparable in accuracy to laboratory measurements, indicating that it fulfills its purpose successfully.
David Copplestone - One of the best experts on this subject based on the ideXlab platform.
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Preliminary results from the first national in situ Gamma Spectrometry survey of the United Kingdom.
Journal of environmental radioactivity, 2007Co-Authors: Andrew N Tyler, David CopplestoneAbstract:In situ Gamma Spectrometry was introduced as part of a national soil and herbage pollution survey of the United Kingdom (UK) in 2002, to evaluate its potential for complimenting or even replacing the conventional soil sampling approach in environmental monitoring. A total of 128 points were measured across the whole of the UK on a 50-km grid, including 11 calibration sites, encompassing a complete spectrum of soil types, geology and depositional environments. Good comparisons are demonstrated between in situ and soil sample derived estimates of environmental radioactivity from spatially matched sampling plans. Air kerma results and the contributions to air kerma rate are also presented and compared with calibrated conventional single parameter GM based instruments. The preliminary results are presented here and show that in situ Gamma Spectrometry provides a rapid and robust approach, providing spatially integrated estimates for environmental monitoring purposes.
