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Article: Overcoming environmental dose rate changes in luminescence dating of waterlain deposits

TitleOvercoming environmental dose rate changes in luminescence dating of waterlain deposits
Authors
KeywordsDose rate
Isochron dating
K-feldspar
Optical dating
Uptake of radioisotopes
Issue Date2008
PublisherPolitechnika Slaska. The Journal's web site is located at http://www.geochronometria.pl
Citation
Geochronometria, 2008, v. 30 n. 1, p. 33-40 How to Cite?
AbstractThis study investigates lacustrine and fluvial sediments on the Sala Us River in the Mu Us Desert in central north China. Significant changes in environmental dose rate in part of the section could be shown to have occurred from measurements of the present day radioactivity and by the age reversal for some samples that had been dated by optically stimulated luminescence (OSL) measurements on quartz. These changes in dose rate can be attributed to recent uptake of radioactive elements found in the sediments; this resulted in significant underestimation of the OSL ages. In this study, the new isochron method using K-feldspar grains has been applied to overcome the effects of changes in dose rate. Calculations are used to show that changes in the environmental dose rate factors, i.e. K, U, Th, water content and cosmic ray flux, and disequilibrium in the U and Th decay chains, e.g. radon escape, have a negligible effect on the isochron age. After applying the new isochron method, the effects of changes in dose rate caused by recent uptake of radioactive elements and changes in past water content were effectively overcome and true ages are obtained; this was verified by repeating the luminescence isochron measurements on samples of overlying and underlying sediments.
Persistent Identifierhttp://hdl.handle.net/10722/72683
ISSN
2014 Impact Factor: 0.723
2015 SCImago Journal Rankings: 1.027
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Ben_HK
dc.contributor.authorLi, SHen_HK
dc.contributor.authorWintle, AGen_HK
dc.date.accessioned2010-09-06T06:44:08Z-
dc.date.available2010-09-06T06:44:08Z-
dc.date.issued2008en_HK
dc.identifier.citationGeochronometria, 2008, v. 30 n. 1, p. 33-40en_HK
dc.identifier.issn1733-8387en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72683-
dc.description.abstractThis study investigates lacustrine and fluvial sediments on the Sala Us River in the Mu Us Desert in central north China. Significant changes in environmental dose rate in part of the section could be shown to have occurred from measurements of the present day radioactivity and by the age reversal for some samples that had been dated by optically stimulated luminescence (OSL) measurements on quartz. These changes in dose rate can be attributed to recent uptake of radioactive elements found in the sediments; this resulted in significant underestimation of the OSL ages. In this study, the new isochron method using K-feldspar grains has been applied to overcome the effects of changes in dose rate. Calculations are used to show that changes in the environmental dose rate factors, i.e. K, U, Th, water content and cosmic ray flux, and disequilibrium in the U and Th decay chains, e.g. radon escape, have a negligible effect on the isochron age. After applying the new isochron method, the effects of changes in dose rate caused by recent uptake of radioactive elements and changes in past water content were effectively overcome and true ages are obtained; this was verified by repeating the luminescence isochron measurements on samples of overlying and underlying sediments.en_HK
dc.languageengen_HK
dc.publisherPolitechnika Slaska. The Journal's web site is located at http://www.geochronometria.plen_HK
dc.relation.ispartofGeochronometriaen_HK
dc.subjectDose rateen_HK
dc.subjectIsochron datingen_HK
dc.subjectK-feldsparen_HK
dc.subjectOptical datingen_HK
dc.subjectUptake of radioisotopesen_HK
dc.titleOvercoming environmental dose rate changes in luminescence dating of waterlain depositsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1733-8387&volume=30&spage=33&epage=40&date=2008&atitle=Overcoming+environmental+dose+rate+changes+in+luminescence+dating+of+waterlain+depositsen_HK
dc.identifier.emailLi, B:boli@hku.hken_HK
dc.identifier.emailLi, SH:shli@hku.hken_HK
dc.identifier.authorityLi, B=rp00736en_HK
dc.identifier.authorityLi, SH=rp00740en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2478/v10003-008-0003-zen_HK
dc.identifier.scopuseid_2-s2.0-44949193765en_HK
dc.identifier.hkuros157617en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-44949193765&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume30en_HK
dc.identifier.issue1en_HK
dc.identifier.spage33en_HK
dc.identifier.epage40en_HK
dc.identifier.isiWOS:000256602300005-
dc.publisher.placePolanden_HK
dc.identifier.scopusauthoridLi, B=36072316000en_HK
dc.identifier.scopusauthoridLi, SH=24438103700en_HK
dc.identifier.scopusauthoridWintle, AG=7005930050en_HK

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