Conveners
Actinide Techniques and Applications
- Marcus Christl (ETH Zurich)
Actinide Techniques and Applications
- Elena Chamizo (Centro Nacional de Aceleradores (CNA), Universidad de Sevilla)
Actinide Techniques and Applications
- Stephan Winkler (Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany)
Description
Discussions on the applications of actinide series elements.
The AMS technique was implemented for the first time in Spain in 2005, with the arrival at the Centro Nacional de Aceleradores (CNA, Seville) of the first compact and multi-elemental system put in the market by High Voltage Engineering Europa (HVEE, Amersfoort, The Netherlands). Since then, actinides measurement techniques have been in constant development at the CNA. To date, 236U, 237Np,...
Fallout from nuclear weapons tests in the 1950s and 1960s has been used for many years as a chronological marker in sediment cores. $^{137}$Cs in fallout has been detected by gamma spectroscopy, and used to validate $^{210}$Pb dating [1]. However, with its half-life of 30 years, $^{137}$Cs activity is reducing and it is now difficult to detect with good precision, especially in the southern...
A.J. López-Fuentes1,2, E. Chamizo2, M. López-Lora2,3, J. Mantero1, J.M. Abril4, M. Ilie5, T. Sava5, G. Ion6
1Department of Applied Physics II, E.T.S.A., University of Seville, Seville, Spain
2Centro Nacional de Aceleradores (CNA), Seville, Spain
3Department of Atomic, Molecular and Nuclear Physics, Physics Faculty, University of Seville, Seville, Spain
4Department of Applied Physics I,...
The most studied actinide radionuclides to unravel contamination sources in general environmental samples have been 238Pu, 239Pu, 240Pu and 241Am. In the last few years, thanks to the development of ultra-sensitive Mass Spectrometry techniques like AMS, this list has been expanded to other less studied and minor actinides nuclides providing key information on the source terms. 236U and 237Np...
The 300 kV Multi-Isotope Low-Energy AMS (MILEA) system was developed by ETH Zurich and Ionplus AG, Switzerland for the ultra-sensitive measurement of long-lived nuclides, such as 14C, 129I, actinides, 10Be, 26Al and 41Ca. The negatively charged ions (such as C-, I-, AnO-) were extracted from the target sample in a Cs-sputtering ion source, and injected into a low-energy analysis system,...
The Annual discharges and the ratio of 129I/236U from the nuclear reprocessing plants are different, the concentration of 129I, 236U, and the ratio of 129I/236U are novel tracers for the transit time of the Arctic Ocean circulation.
We developed a new 236U-AMS with the time-of-flight detector system at the MALT, The University of Tokyo. To improve sensitivity and decrease background by...
In 2011, during the Fenice11 expedition to the Tyrrhenian Sea, a total of about 350$\,$L of sea water samples were collected and prepared as large volume intercomparison sample for $^{236}$U/$^{238}$U. In this contribution, the results of the intercomparison will be presented.
All samples were filtered through several 0.45$\,\mu$m membrane filters and collected in a 400$\,$L plastic tank....
From a multi-isotope direct-AMS survey of 310 uranium ore concentrates (UOCs), 236U/238U ratios from 2x10-12 to 2x10-7 are measured. However, a range from low-10-12 to mid-10-10 is expected from directly mined natural uranium ore minerals. This upper-end discrepancy would normally be attributed to inputs of spent fuel materials, but the numerous occurrences and the lack of economic reasons to...
Abstract: The compact AMS devices are the tendency of AMS development. Based on the previously developed air-insulated AMS, the compact AMS device with a terminal voltage of 0.25 MV has been established. In this paper, a low detection limit measurement method for 239Pu using compact accelerator mass spectrometry (AMS) has been presented. A measurement technique for 239Pu was established based...
The recent discovery of naturally-occurring $^{244}$Pu [1,2] has been made possible by achieving high overall detection efficiency for plutonium by AMS [3]. Overall efficiency is determined by a combination of ionisation efficiency, charge state yield and beam transmission through the AMS system. Of these, ionisation efficiency remains as the principal limitation, with few instances where...
