Americium isotope analysis by Thermal Ionization Mass Spectrometry using the total evaporation method

Development and comparison of high accuracy thermal ionization mass spectrometry methods for uranium isotope ratios determination in nuclear fuel

“…The isotope ratio measurement uncertainties estimation was described in previous work [12]. The isotope ratio (R) uncertainty (u) at k = 1 was estimated using Eq.…”

“…The TE method applied in the present study was described in details in previous work for the 235 U/ 238 U major isotope ratio measurement [1,2,8,12]. The quantity of uranium deposit was 1 µg.…”

“…The Thermo Fisher Triton TIMS used for the experiments and the deposit technique were previously described in detail [12]. The TIMS is equipped with 9 Faraday cups (all are movable except the central denoted C) which can be coupled to 10 11 Ω current amplifiers (9 are available and hereafter Faraday cups coupled with 10 11 Ω amplifiers are referred to as FC 11) or a 10 12 Ω current amplifier (1 is available and hereafter a Faraday cup coupled with a 10 12 Ω amplifier is referred to as FC 12).…”

“…The SEM is combined with a high abundance filter (RPQ for Retarding Potential Quadrupole). The SEM calibration was performed using the method described in [12].…”

243Am certified reference material for mass spectrometry

“…In the total evaporation method, the evaporation filament is heated up to maintain a steady intensity and measured until the whole sample is consumed. In this way, the fractionation effects in the ion source are minimized [25][26][27][28][29]. A mass fractionation correction by measuring an americium isotopic standard was not possible due to unavailability of such material.…”