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Article: Preliminary observations on the spatial variability of fallout caesium-137 at reference sites in Hong Kong

TitlePreliminary observations on the spatial variability of fallout caesium-137 at reference sites in Hong Kong
Authors
KeywordsFallout 137Cs Reference Values
Hong Kong
Monsoonal Tropics
Site Selection And Sampling
Issue Date1999
Citation
Geografia Fisica E Dinamica Quaternaria, 1999, v. 22 n. 1, p. 41-46 How to Cite?
AbstractCaesium-137 (137Cs) tracing of sediment movement depends substantially on a valid assessment of 137Cs reference values. Recent research suggests that 137Cs is more spatially varied than previously assumed. The range of 137Cs values at and between reference sites, and environmental controls on 137Cs behavior are prime topics for study. The present research investigates reference sites in the monsoonal tropics of Hong Kong. There was doubt about the use of 137Cs in such areas, sustained by the paucity of 137Cs studies in the Tropics and the potential lack of 137Cs here due to global air circulation patterns. This paper shows that the technique is applicable in the Hong Kong environment. As rainfall controls 137Cs fallout, a large range of mean annual rainfall within a small area makes Hong Kong a good location to test 137Cs variability. Three input sites representing a wide range of rainfall totals are reported here. The uneroded status of an input site is tested by producing a profile of 137Cs totals in 2 cm increments; the form of the profile reflecting 137Cs movement in the soil. The results illustrate the difficulties of using a simple model of profile distribution as confirmation of a site's stability. They also confirm the difficulty of finding sites that have experienced no significant disturbance in the past four decades. Ten core samples and the profile point value were used to assess 137Cs variability across the input sites. These data permit an evaluation of sampling methodology. The present results suggest that a large sample number is required to express the mean input value at a site. If this is not to impede routine use of the 137Cs technique, further investigations of sampling methodology are needed.
Persistent Identifierhttp://hdl.handle.net/10722/157809
ISSN
2015 Impact Factor: 0.641
2015 SCImago Journal Rankings: 0.437

 

DC FieldValueLanguage
dc.contributor.authorRuse, Men_US
dc.contributor.authorPeart, Men_US
dc.date.accessioned2012-08-08T08:55:46Z-
dc.date.available2012-08-08T08:55:46Z-
dc.date.issued1999en_US
dc.identifier.citationGeografia Fisica E Dinamica Quaternaria, 1999, v. 22 n. 1, p. 41-46en_US
dc.identifier.issn0391-9838en_US
dc.identifier.urihttp://hdl.handle.net/10722/157809-
dc.description.abstractCaesium-137 (137Cs) tracing of sediment movement depends substantially on a valid assessment of 137Cs reference values. Recent research suggests that 137Cs is more spatially varied than previously assumed. The range of 137Cs values at and between reference sites, and environmental controls on 137Cs behavior are prime topics for study. The present research investigates reference sites in the monsoonal tropics of Hong Kong. There was doubt about the use of 137Cs in such areas, sustained by the paucity of 137Cs studies in the Tropics and the potential lack of 137Cs here due to global air circulation patterns. This paper shows that the technique is applicable in the Hong Kong environment. As rainfall controls 137Cs fallout, a large range of mean annual rainfall within a small area makes Hong Kong a good location to test 137Cs variability. Three input sites representing a wide range of rainfall totals are reported here. The uneroded status of an input site is tested by producing a profile of 137Cs totals in 2 cm increments; the form of the profile reflecting 137Cs movement in the soil. The results illustrate the difficulties of using a simple model of profile distribution as confirmation of a site's stability. They also confirm the difficulty of finding sites that have experienced no significant disturbance in the past four decades. Ten core samples and the profile point value were used to assess 137Cs variability across the input sites. These data permit an evaluation of sampling methodology. The present results suggest that a large sample number is required to express the mean input value at a site. If this is not to impede routine use of the 137Cs technique, further investigations of sampling methodology are needed.en_US
dc.languageengen_US
dc.relation.ispartofGeografia Fisica e Dinamica Quaternariaen_US
dc.subjectFallout 137Cs Reference Valuesen_US
dc.subjectHong Kongen_US
dc.subjectMonsoonal Tropicsen_US
dc.subjectSite Selection And Samplingen_US
dc.titlePreliminary observations on the spatial variability of fallout caesium-137 at reference sites in Hong Kongen_US
dc.typeArticleen_US
dc.identifier.emailPeart, M:mrpeart@hkucc.hku.hken_US
dc.identifier.authorityPeart, M=rp00612en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0032744408en_US
dc.identifier.volume22en_US
dc.identifier.issue1en_US
dc.identifier.spage41en_US
dc.identifier.epage46en_US
dc.identifier.scopusauthoridRuse, M=7003479376en_US
dc.identifier.scopusauthoridPeart, M=7003362850en_US

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