title: Solution to isotope amount ratio measurement challenge.
authors.affiliation: Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany. olaf.rienitz@ptb.de.
authors.forename: Olaf
authors.initials: O
authors.lastname: Rienitz
authors.affiliation: Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany.
authors.forename: Axel
authors.initials: A
authors.lastname: Pramann