Publications

First study on U-236 in the Northeast Pacific Ocean using a new target preparation procedure for AMS measurements

Author(s)
R. Eigl, P. Steier, S. R. Winkler, K. Sakata, A. Sakaguchi
Abstract

We succeeded in obtaining the depth profile of U-236 for a sampling station in the Northeast Pacific Ocean using only one litre of seawater sample from each depth. For this purpose, a new procedure was developed that allowed for the preparation of accelerator mass spectrometry targets for trace uranium using only 100 mu g of iron carrier material. The U-236 concentrations in water samples from the Northeast Pacific Ocean showed large variations from (9.26 +/- 0.42) x 10(6) atoms/kg at 60 m depth to (0.08 +/- 0.02) x 10(6) atoms/kg at a depth of 3000 m. The high U-236 concentrations in surface water reflect the input of U-236 by global and local" fallout from nuclear weapons tests. The low U-236 concentrations in seawater from 1500 m and below are an indicator for'the low vertical diffusion of surface water to deeper layers in the North Pacific Ocean. The total inventory of U-236 on the water column was (8.35 +/- 0.23) x 10(12) atoms/m(2), which is lower compared to those of other ocean regions solely affected by global fallout on comparable latitudes. This study represents the first dataset for U-236 in the Pacific Ocean and shows the possibility of downsizing sample volumes which may help in future applications of U-236 as tracer for large ocean areas

Organisation(s)
Isotope Physics
External organisation(s)
Hiroshima University, Natl Res Fdn, National Research Foundation - South Africa, iThembaLABS Gauteng, University of Tsukuba
Journal
Journal of Environmental Radioactivity
Volume
162
Pages
244-250
No. of pages
7
ISSN
0265-931X
DOI
https://doi.org/10.1016/j.jenvrad.2016.05.025
Publication date
10-2016
Peer reviewed
Yes
Austrian Fields of Science 2012
103013 Ion physics, 103037 Environmental physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/first-study-on-u236-in-the-northeast-pacific-ocean-using-a-new-target-preparation-procedure-for-ams-measurements(1e3a5e0c-e429-4605-bb39-8a8d585fec84).html