A new AMS facility MILEA at the Nuclear Physics Institute in Řež, Czech Republic

Prof. Jan Kučera1, Dr. Sascha  Maxeiner2, Dr. Arnold Müller2,3, Assoc. Prof. Mojmír Němec4, Prof. Jan  John4, Dr. Ivo Světlík1, Dr. Dagmar Dreslerová5, Dr. Jan Kameník1, Dr. Kateřina  Pachnerová-Brabcová1, Dr. Josef  Tecl1, Joël Bourquin2, Andreas  Herrmann2, Dr. Simon Fahrni2

1Nuclear Physics Institute of the Czech Academy of Sciences, Husinec-Řež, Czech Republic, Řež 130, Husinec-Řež, Czech Republic, 2Ionplus AG, Dietikon, Switzerland, 3ETH Zurich, Zurich, Switzerland, 4Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Switzerland, 5Institute of Archaeology of the Czech Academy of Sciences,, Prague, Czech Republic

Introduction
Developments and applications of accelerator mass spectrometry (AMS) for determination of long-lived naturally occurring and man-made radionuclides at ultra-trace levels are continuously increasing. Simultaneously, new AMS systems are being designed, produced and installed. We briefly describe a new Multi-Isotope Low-Energy AMS (MILEA) system, which was developed in a collaboration of Ionplus AG and ETH Zurich, Switzerland. It combines the established ion source technology and the vacuum insulated accelerator of MICADAS (upgraded to 300 kV) with the well-proven concept of the high energy spectrometer layout of the ETH “TANDY” instrument. At the back-end, an improved low-noise ΔE-Eres gas ionization detector provides outstanding separation and identification of interfering particles.

Methods
Here, we report experience of the first installation of MILEA outside Switzerland for a newly established AMS laboratory within a consortium of the Nuclear Physics Institute (NPI) of the Czech Academy of Sciences (CAS), Faculty of Nuclear Sciences and Physical Engineering of the Czech Technical University in Prague and the Archaeological Institute Prague of CAS. This first Czech AMS laboratory is located at NPI, Řež. The consortium has been established to deal with a project “Ultra-trace isotope research in social and environmental studies using accelerator mass spectrometry”, acronym RAMSES. The presented MILEA system is designed but not limited to for determination of ¹⁰Be, ¹⁴C, ²⁶Al, ⁴¹Ca, ¹²⁹I, U, Pu and other actinoides. The performance of this next generation multi-isotope AMS facility is given in terms of factory- and on-site acceptance tests for the radionuclides ¹⁰Be, ¹⁴C, ²⁶Al, ¹²⁹I, ²³⁶, ²³³U for most of the following parameters: transmissions from the injector to the detector, abundance sensitivity, a stable/radioisotope blank ratio, simple and overall sample scatter of the radioisotope/stable isotope ratios. In the acceptance tests, well known or in-house standards and blanks were used.

Results and discussion
All measured parameters satisfied the needs of RAMSES project and will be discussed in this paper.

Acknowledgement
The work was supported by MEYS Czech Republic (project No. CZ.02.1.01 /0.0/0.0/16_019/0000728).


Biography:

Jan Kučera is a senior scientist at the Nuclear Physics Institute of the Czech Academy of Sciences in Husinec-Řež. and has been appointed professor of nuclear chemistry at the Czech Technical University in Prague at the Faculty of Nuclear Sciences and Physical Engineering. His research interests involve nuclear analytical methods, namely neutron activation analysis. He authored and co-authored more than 180 publications in peer reviewed journals and about 80 conference presentations. Recently, he has become a key person of RAMSES project aimed at the establishment of the first AMS laboratory in the Czech Republic.

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Date

Nov 08 - 19 2021