Development of the 3He mass spectrometric low-level tritium analytical facility at the IAEA

Here we present a mass spectrometric system specifically developed for the analysis of ultra-low-level tritium by the 3He ingrowth method. The system was designed and developed in the Isotope Hydrology Laboratory of the International Atomic Energy Agency and consists of an off-line water degassing u...

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Veröffentlicht in:Journal of analytical atomic spectrometry 2022-11, Vol.37 (12), p.2502-2509
Hauptverfasser: Mabry, Jennifer, Romeo, Nicolo, Kainz, Gerhard, Copia, Lorenzo, Masuda, Harue, Matsumoto, Takuya
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container_end_page 2509
container_issue 12
container_start_page 2502
container_title Journal of analytical atomic spectrometry
container_volume 37
creator Mabry, Jennifer
Romeo, Nicolo
Kainz, Gerhard
Copia, Lorenzo
Masuda, Harue
Matsumoto, Takuya
description Here we present a mass spectrometric system specifically developed for the analysis of ultra-low-level tritium by the 3He ingrowth method. The system was designed and developed in the Isotope Hydrology Laboratory of the International Atomic Energy Agency and consists of an off-line water degassing unit to remove pre-existing 3He from sample water and a mass spectrometer system (Thermo Fisher Helix SFT) with a gas purification and separation system. The mass spectrometer system is equipped with a gas pipette system that inlets calibrated amounts of 3He (99.995% 3He spike) to accurately calibrate the mass spectrometer's sensitivity. The procedural blank level of 3He in our system is extremely low and on the order of 10−17 cm3 STP, which enables us to quantify tritium in water samples (100 cm3) as low as 0.05 TU with an ingrowth time of 2 months. Quantification of even lower tritium levels are possible by loading more water and/or by increasing the ingrowth time (e.g., 0.01 TU with 400 cm3 water stored for 4 months). We analysed a set of water samples from the Tritium Intercomparison Exercise by IAEA (TRIC 2018) and confirmed that our data were consistent with the expected values. We have also confirmed that our analysis of natural groundwater samples agree well with the data obtained by the conventional liquid scintillation counting (LSC) method.
doi_str_mv 10.1039/d2ja00173j
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source Royal Society Of Chemistry Journals; Alma/SFX Local Collection
subjects Degassing
Groundwater
Hydrology
Inlets
Nuclear energy
Scintillation counters
Spectrometry
Tritium
Water sampling
title Development of the 3He mass spectrometric low-level tritium analytical facility at the IAEA
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