Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/9600
Title: High-sensitivity isobar-free AMS measurements and reference materials for 55Fe, 68Ge and 202gPb
Authors: Wallner, A
Bichler, M
Buczak, K
Fink, D
Forstner, O
Golser, R
Hotchkis, MAC
Klix, A
Krása, A
Kutschera, W
Lederer, C
Plompen, AJM
Priller, A
Schumann, D
Semkova, VM
Steier, P
Keywords: Isospin
Mass spectroscopy
Accelerators
Interference
Isotopes
Carbon 14
Radioisotopes
Iodine isotopes
Gallim isotopes
Germanium isotopes
Physics
Iron isotopes
Neutron activation analysis
Issue Date: 1-Jan-2013
Publisher: Elsevier B.V.
Citation: Wallner, A., Bichler, M., Buczak, K., Fink, D., Forstner, O., Golser, R., Hotchkis, M. A. C., Klix, A., Krasa, A., Kutschera, W., Lederer, C., Plompen, A., Priller, A., Schumann, D., Semkova, V., & Steier, P. (2013). High-sensitivity isobar-free AMS measurements and reference materials for 55Fe, 68Ge and 202gPb. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 294, 374-381. doi:10.1016/j.nimb.2012.03.029
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=2.74years), 68Ge (t1/2=270.9days) and 202Pb (t1/2=52.5kyr), 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. AMS measurements 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 reference materials with well-known ratios. A new and highly accurate reference material 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 isobar 202Tl was produced via neutron activation and served as a proxy for 202Pb AMS measurements. © 2012 Elsevier B.V.
Gov't Doc #: 9682
URI: https://doi.org/10.1016/j.nimb.2012.03.029
http://apo.ansto.gov.au/dspace/handle/10238/9600
ISSN: 0168-583X
Appears in Collections:Journal Articles

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