Guidelines and limits for the quantification of ra isotopes and related radionuclides with the radium delayed coincidence counter (RaDeCC)
van Beek, Pieter
Bruach, Joan Manuel
MetadataShow full item record
The Radium Delayed Coincidence Counter (RaDeCC) is one of the most extensively used equipment for measuring 223Ra and 224Ra activities in water and sediment samples. Samples are placed in a closed He‐circulation system that carries the Rn produced by the decay of Ra to a scintillation cell. Each alpha decay recorded in the cell is routed to an electronic delayed coincidence system which enables the discrimination of 223Ra and 224Ra. In this study, the measurement and quantification methods using the RaDeCC system are assessed through analyses of registered data in different RaDeCC systems worldwide and a set of simulations. Results of this work indicate that the equations used to correct for 223Ra and 224Ra cross‐talk interferences are only valid for a given range of activities and ratios between isotopes. Above certain limits that are specified in this study, these corrections may significantly overestimate the quantification of 223Ra and 224Ra activities (up to ~40% and 30%, respectively), as well as the quantification of their parents 227Ac and 228Th. High activities of 226Ra may also produce an overestimation of 224Ra activities due to the buildup of 222Rn, especially when long measurements with low activities of 224Ra are performed. An improved method to quantify 226Ra activities from the buildup of 222Rn with the RaDeCC system is also developed in this study. Wethus provide a new set of guidelines for the appropriate quantification of 223Ra, 224Ra, 227Ac, 228Th, and 226Ra with the RaDeCC system.
Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 125(4), (2020): e2019JC015544, doi:10.1029/2019JC015544.
Suggested CitationDiego-Feliu, M., Rodellas, V., Alorda-Kleinglass, A., Tamborski, J., van Beek, P., Heins, L., Bruach, J. M., Arnold, R., & Garcia-Orellana, J. (2020). Guidelines and limits for the quantification of ra isotopes and related radionuclides with the radium delayed coincidence counter (RaDeCC). Journal of Geophysical Research-Oceans, 125(4), e2019JC015544.
Showing items related by title, author, creator and subject.
Johnson, Winifred M.; Kido Soule, Melissa C.; Kujawinski, Elizabeth B. (John Wiley & Sons, 2017-03-20)The field of metabolomics seeks to characterize the suite of small molecules that comprise the end-products of cellular regulation. Metabolomics has been used in biomedical applications as well as environmental studies ...
Development and validation of a real-time quantitative PCR assay for the detection and quantification of Perkinsus marinus in the Eastern oyster, Crassostrea virginica DeFaveri, Jacquelin; Smolowitz, Roxanna M.; Roberts, Steven B. (National Shellfisheries Association, 2009-08)Perkinus marinus causes a devastating disease, known as Dermo, in the Eastern oyster Crassostrea virginica. Routine detection of the disease is traditionally accomplished by the use of the Ray/Makin assay, using Fluid ...
Quantification of the spatial and temporal evolution of stratified shear instabilities at high Reynolds number using quantitative acoustic scattering techniques Fincke, Jonathan R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-02)The spatial and temporal evolution of stratified shear instabilities is quantified in a highly stratified and energetic estuary. The measurements are made using high-resolution acoustic backscatter from an array composed ...