Title: High-sensitivity isobar-free AMS measurements and reference materials for 55Fe, 68Ge and 202gPb
Authors: WALLNER A.BICHLER MaxBUCZAK K.FINK D.FORSTNER O.GOLSER RobinHOTCHKIS M.a.c.KLIX A.KRASA ANTONINKUTSCHERA WalterLEDERER C.PLOMPEN ArjanPRILLER AlfredSCHUMANN D.SEMKOVA ValentinaSTEIER P.
Citation: NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS vol. 294 p. 374-381
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2013
JRC N°: JRC72896
ISSN: 0168-583X
URI: http://www.sciencedirect.com/science/article/pii/S0168583X12002261
http://publications.jrc.ec.europa.eu/repository/handle/JRC72896
DOI: 10.1016/j.nimb.2012.03.029
Type: Articles in periodicals and books
Abstract: Isobaric interference represents one of the major limitations in mass spectrometry. For a few cases in AMS with tandem accelerators, isobaric interference is completely excluded like the well-known major isotopes 14C, 26Al, 129I. Additional isotopes are 55Fe (t1/2 = 2.74 years), 68Ge (t1/2 = 270.9 days) and 202Pb (t1/2 = 52.5 kyr), with 68Ge and 202Pb never been used in AMS so far. Their respective stable isobars, 55Mn, 68Zn and 202Hg do not form stable negative ions. The exceptional sensitivity of AMS for 55Fe, 68Ge and 202gPb offers important insights into such different fields like nuclear astrophysics, fundamental nuclear physics and technological applications. VERA, a dedicated AMS facility is well suited for developing procedures for new and non-standard isotopes. AMSmeasurements at the VERA facility established low backgrounds for these radionuclides in natural samples. Limits for isotope ratios of <10−15, <10−16 and <2 × 10−14 were measured for 55Fe/56Fe, 68Ge/70Ge and 202Pb/Pb, respectively. In order to generate accurate isotope ratios of sample materials, AMS relies on the parallel measurement of referencematerials with well-known ratios. A new and highly accurate referencematerial for 55Fe measurements with an uncertainty of ±1.6% was produced from a certified reference solution. In case of 68Ge dedicated neutron activations produced a sufficiently large number of 68Ge atoms that allowed quantifying them through the activity of its decay product 68Ga. Finally, for 202Pb, the short-lived isobar202Tl was produced via neutron activation and served as a proxy for 202Pb AMSmeasurements.
JRC Directorate:Health, Consumers and Reference Materials

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