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Journal Articles

Radiochemical reactions between tritium molecule and carbon dioxide

Shu, Wataru; Ohira, Shigeru; Suzuki, Takumi; Nishi, Masataka

Fusion Science and Technology, 48(1), p.684 - 687, 2005/07

https://doi.org/10.13182/FST05-A1016

Times Cited Count：3 Percentile：24.17(Nuclear Science & Technology)

As part of a series of studies on radiochemical reactions that may take place in the fuel processing systems of a future D-T fusion machine like the ITER, reactions of tritium molecule (T $_{2}$ ) and carbon dioxide (CO $_{2}$ ) were examined by laser Raman spectroscopy and quadrupole mass spectrometry (QMS). Both T $_{2}$ and CO $_{2}$ decreased rapidly in the first 30 minutes after mixing, and then the reactions between them became much slower. As the predominant products of the reactions, carbon monoxide (CO) and tritiated water (T $_{2}$ O) were found in gaseous phase and condensed phase, respectively. However, there existed also some solid products that were thermally decomposed to CO, CO $_{2}$ , T $_{2}$ , T $_{2}$ O, etc. during baking at 150 $^{circ}$ C and 250 $^{circ}$ C.

Journal Articles

Radiochemical reactions between tritium oxides and carbon monoxide

Shu, Wataru; Ohira, Shigeru; Suzuki, Takumi; Nishi, Masataka

Fusion Engineering and Design, 70(2), p.123 - 129, 2004/02

https://doi.org/10.1016/j.fusengdes.2003.09.001

Times Cited Count：14 Percentile：66.01(Nuclear Science & Technology)

As a study on radiochemical reactions in the process of tritium recovery from the in-vessel components of future deuterium-tritium fusion machine like ITER beta-induced reactions in a N $_{2}$ -balanced system of tritium oxides (T $_{2}$ O/T $_{2}$ O $_{2}$ ) with CO were examined by laser Raman, Fourier transition infrared (FT-IR) and mass spectroscopy. The depletion of CO follows a first-order reaction with a rate constant of 0.02 day $^{-1}$ , whereas the formation of CO $_{2}$ is a complex process whose rate constant decreases from 2 day $^{-1}$ to 0.02 day $^{-1}$ . The main species on the 49th day after mixing CO are the produced CO $_{2}$ and the balanced gas (N $_{2}$ ) in the gaseous phase, and the tritiated water predominates in the condensed phase. Tritiated substances like aldehyde, alcohol and carboxylic acid found in T $_{2}$ -CO system were not detected in the products of reactions between tritium oxides and carbon monoxide at the same detection limit.