Isolation and quantification of a Mo isotope solution from proton irradiated niobium.

Author(s) Roos, P.
Journal Talanta
Date Published 2019 Nov 01
Abstract

Mo (4000 y half-life) formed through the Nb(p,n)Mo reaction was isolated from a niobium target foil previously used in a low energy medical cyclotron. Mo has identical characteristic x-ray emission and mass as the isomer Nb and stable Nb present in the target foil at much higher concentrations. This makes distinction between Mo, Nb and stable Nb difficult using radiometric or mass spectrometric methods. An anion exchange method in combination with x-ray spectrometry and ICP-MS/OES enabled quantitative isolation of about 0.4 μg Mo (14 kBq) from Nb with a separation factor >10 on a single column. An extraction chromatography column (TEVA) was used to reach aNb/Mo activity ratio of <10 and an atom ratio Nb/Mo <1% making the Mo suitable for both radiometric and mass spectrometric testing. Mo is the only radioisotope of molybdenum with a long enough half-life suitable for this purpose. Calibration of the Mo isotope solution was done through x-ray spectrometry using a characterized BEGe-detector in combination with aTc solution. This is the first reported isolation of aMo solution in the literature and the first time a LSC-spectrum of Mo is shown.

DOI 10.1016/j.talanta.2019.06.042
ISSN 1873-3573
Citation Roos P. Isolation and quantification of a Mo isotope solution from proton irradiated niobium. Talanta. 2019;204:769-775.

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