A device to generate multi-concentration tritiated water vapor

Access to a gas tritium source with controlled concentrations is the key to calibrating tritium measurement instruments. In this study, a method of generating multi-concentration tritiated water vapor based on a closed circulation loop is outlined. The method produces tritiated water vapor by a bubbling process, the operational parameters for achieving the saturated bubbling process were determined through simulation. The temperature dependence of the isotope fractionation coefficient has been established through experimental tests. In order to avoid leakage of tritium and contamination of laboratory environment, tritiated water vapor generator was plugged into a closed loop and tested. Two tritiated water standard samples with known concentrations were used to produce 20 tritiated water vapor samples at 10 different temperatures, where the experimental results were in good agreement with the empirical formula. Based on the experimental results, the model for a non-closed loop tritiated water vapor generation has been modified, and the formula for multi-concentration tritiated water vapor generation based on a closed loop is established.