4.4 Article

Noble gas adsorption to tuff

Journal

JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 243, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2021.106809

Keywords

Nuclear explosion monitong; Noble gases; Adsorption; Tuff

Funding

  1. National Nuclear Security Admin-istration, Defense Nuclear Nonproliferation Research and Development (NNSA DNN RD)
  2. Department of Energy (DOE) [DE-AC06-76RLO 1830]

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A method for measuring the adsorption of trace noble gas elements to the surfaces of geologic materials was developed and tested. It was found that noble gas adsorption increases with increasing atomic mass and decreasing temperature, and also increases non-linearly with increasing gas concentration.
A method was developed to measure trace noble gas element adsorption to the surfaces of geologic materials in the presence of a background gas that could potentially compete for surface adsorption sites. Adsorption of four noble gas elements (Ne, Ar, Kr, and Xe) at a concentration of 100 ppm in helium and nitrogen were measured on a sample of crushed tuff at 0, 15, 30, and 45 degrees C. In addition, Ne, Ar, Kr, and Xe at 250 ppm and 500 ppm in nitrogen at 15 degrees C were measured. Noble gas adsorption was found to increase with increasing atomic mass and decreasing temperature. It was also observed that the relative increase in noble gas element adsorption with decreasing temperature tends to increase with increasing atomic mass. As the noble gas concentrations in nitrogen increased, adsorption increased in a slightly non-linear fashion which could be modeled using a Freundlich isotherm. For noble gas concentrations that were <= 100 ppm Henry's Law constant were calculated.

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