气候变化领域集成服务门户(CCPortal): Guidelines and Limits for the Quantification of Ra Isotopes and Related Radionuclides With the Radium Delayed Coincidence Counter (RaDeCC)

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DOI	10.1029/2019JC015544
	Guidelines and Limits for the Quantification of Ra Isotopes and Related Radionuclides With the Radium Delayed Coincidence Counter (RaDeCC)
	Diego-Feliu M.; Rodellas V.; Alorda-Kleinglass A.; Tamborski J.; van Beek P.; Heins L.; Bruach J.M.; Arnold R.; Garcia-Orellana J.
发表日期	2020
ISSN	21699275
卷号	125 期号:4
英文摘要	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. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	quantification; Ra isotopes; RaDeCC; submarine groundwater discharge; U/Th series
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186921
作者单位	ICTA, Institut de Ciència i Tecnologia Ambientals, Universitat Autònoma de Barcelona, Bellaterra, Spain; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Centre for Water Resources Studies, Dalhousie University, Halifax, NS, Canada; LEGOS, Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, Université de Toulouse, CNES, CNRS, IRD, UPS, Observatoire Midi Pyrénées, Toulouse, France; AWI, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Departament de Física, Universitat Autònoma de Barcelona, Bellaterra, Spain; Scientific Computer Instruments, West Columbia, SC, United States
推荐引用方式 GB/T 7714	Diego-Feliu M.,Rodellas V.,Alorda-Kleinglass A.,et al. Guidelines and Limits for the Quantification of Ra Isotopes and Related Radionuclides With the Radium Delayed Coincidence Counter (RaDeCC)[J],2020,125(4).
APA	Diego-Feliu M..,Rodellas V..,Alorda-Kleinglass A..,Tamborski J..,van Beek P..,...&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).
MLA	Diego-Feliu M.,et al."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(2020).