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A method for continuous 239Pu determinations in Arctic and Antarctic ice cores
journal contribution
posted on 2023-05-19, 02:40 authored by Arienzo, MM, McConnell, JR, Chellman, N, Criscitiello, AS, Mark Curran, Fritzsche, D, Kipfstuhl, S, Mulvaney, R, Nolan, M, Opel, T, Sigl, M, Steffensen, JPAtmospheric nuclear weapons testing (NWT) resulted in the injection of plutonium (Pu) into the atmosphere and subsequent global deposition. We present a new method for continuous semiquantitative measurement of 239Pu in ice cores, which was used to develop annual records of fallout from NWT in ten ice cores from Greenland and Antarctica. The 239Pu was measured directly using an inductively coupled plasma–sector field mass spectrometer, thereby reducing analysis time and increasing depth-resolution with respect to previous methods. To validate this method, we compared our one year averaged results to published 239Pu records and other records of NWT. The 239Pu profiles from the Arctic ice cores reflected global trends in NWT and were in agreement with discrete Pu profiles from lower latitude ice cores. The 239Pu measurements in the Antarctic ice cores tracked low latitude NWT, consistent with previously published discrete records from Antarctica. Advantages of the continuous 239Pu measurement method are (1) reduced sample preparation and analysis time; (2) no requirement for additional ice samples for NWT fallout determinations; (3) measurements are exactly coregistered with all other chemical, elemental, isotopic, and gas measurements from the continuous analytical system; and (4) the long half-life means the 239Pu record is stable through time.
History
Publication title
Environmental Science and TechnologyVolume
50Issue
13Pagination
7066-7073ISSN
0013-936XDepartment/School
Institute for Marine and Antarctic StudiesPublisher
Amer Chemical SocPlace of publication
1155 16Th St, Nw, Washington, USA, Dc, 20036Rights statement
© 2016 American Chemical SocietyRepository Status
- Restricted