A method for measuring radioxenon emanation with cryotrapping and γ spectroscopy
- 71 Downloads
A method has been developed to eliminate environmental variables and macroscopic diffusive transport to obtain a direct measurement of radioxenon’s emanation coefficient, K, from a solid matrix. The emanation measurement apparatus (EMA) utilizes neutron activation and a cryotrapping technique with LN2, which increased gas trapping efficiency from 4 ± 3 to 78 ± 7%. Emanation values are measured by γ spectroscopy with a High Purity Germanium detector. Preliminary results from EMA demonstrated the capability of this new process to make reproducable emanation measurements with quantifiable uncertainty. Initial experiments produced U3O8 radioxenon emanation coefficients of 0.016 ± 0.002 for 133Xe and 0.025 ± 0.002 for 135Xe at temperatures ranging from 20 to 80 °C.
KeywordsRadioxenon Cryotrapping Recoil emanation Noble gas transport
Funding was provided by Defense Threat Reduction Agency (Grant No. HDTRA1-12-1-0009).
- 1.CTBTO Preparatory Commission (2018) The treaty. https://www.ctbto.org/the-treaty/. Accessed 14 Jan 2018
- 2.CTBTO Preparatory Commission (2018) Map. https://www.ctbto.org/map. Accessed 14 Jan 2018
- 3.Johnson CM (2016) Radioactive xenon and argon production and transport in the environment. University of Texas at Austin, AustinGoogle Scholar
- 7.Robertson JB (1969) Behavior of xenon-133 gas after injection underground: molecular diffusion, materials balance, and barometric pressure effects. Idaho Falls. Clearinghouse for Federal Scientific and Technical Information, Springfield, VAGoogle Scholar
- 12.Blood M (2018) A method for measuring radioxenon emanation with cryotrapping and γ spectroscopy. University of Texas at Austin, AustinGoogle Scholar
- 13.Baldwin NL, Foushee FC, Greenwood JS (1980) Fission product release from TRIGA-LEU reactor fuels, Report # GA-A--16287. General Atomic Co., San Diego, CAGoogle Scholar