Hou, Xiaolin

Li, Hongchun

Zhang, Luyuan

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Apr 10, 201860-year record of iodine-129 in Philippines terrestrial sediment revealing humannuclear activities history at low latitude areaHou, Xiaolin; Zhang, Luyuan; Li, HongchunPublication date:2017Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Hou, X., Zhang, L., & Li, H. (2017). 60-year record of iodine-129 in Philippines terrestrial sediment revealinghuman nuclear activities history at low latitude area. Abstract from 14th International Conference on AcceleratorMass Spectrometry, Ottawa, Canada.Abstract ID: 175 Track classification: RTA 60-year record of iodine-129 in Philippines terrestrial sediment revealing human nuclear activities history at low latitude area Global distribution of iodine-129 (129I) is important to apply it as an environmental tracer and for its environmental safety assessment and management [1]. Despite a number of 129I data reported throughout many regions [2,3], less is known at low latitude area. A sediment core collected from the Taal Lake in the north of Philippines was analyzed for 129I and 127I aiming to investigate the influence of human nuclear activities on terrestrial systems of low latitude regions. Concentrations of 129I in the core ranged from (0.5±0.07)×1E5 atoms/g in the pre-nuclear era to (215.92±20.16)×1E5 atoms/g. Compared to other marine and terrestrial cores, levels of 129I in the Taal Lake sediment were as similar as that in Mississippi river (USA), but 1-3 orders of magnitude lower than the European lakes and sea sediments [2,3]. Taking into account the factors of distance from sites of human nuclear activities, climate and geological settings of Taal Lake, the increased 129I/127I ratios indicated that the origin of 129I is predominated by testing of the Pacific Proving Ground, global fallout of other nuclear testing and European nuclear reprocessing plants, which were primarily transported by air. Easterly equatorial trade wind and East Asian Winter Monsoon are important significant transportation pathways of 129I to the southeast Asia. The lowest 129I/127I ratio of (2.04±0.42) ×1E-12 at the bottom of the sediment suggested less migration of 129I from upper to deep layers and negligible influence of nuclear tests until 1956, and also imply that incursion of seawater might occur in Taal Lake. Volcanic eruption and direct geothermal fluid activity at the Taal Lake might change the sedimentation pattern and influence the retention of iodine isotopes. Dr. ZHANG, Luyuan (State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences); HOU, Xiaolin (Technical University of Denmark); Prof. LI, Hongchun --------------------------------------------------------------------------------------------------------   

60-year record of iodine-129 in Philippines terrestrial sediment revealing human nuclear activities history at low latitude area

http://orbit.dtu.dk/ws/files/142167609/Pages_from_Untitled_2.pdf

60-year record of iodine-129 in Philippines terrestrial sediment revealing human nuclear activities history at low latitude area

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology