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Xenon adsorption on geological media and implications for radionuclide signatures.

Abstract：

:The detection of radioactive noble gases is a primary technology for verifying compliance with the pending Comprehensive Nuclear-Test-Ban Treaty. A fundamental challenge in applying this technology for detecting underground nuclear explosions is estimating the timing and magnitude of the radionuclide signatures. While the primary mechanism for transport is advective transport, either through barometric pumping or thermally driven advection, diffusive transport in the surrounding matrix also plays a secondary role. From the study of primordial noble gas signatures, it is known that xenon has a strong physical adsorption affinity in shale formations. Given the unselective nature of physical adsorption, isotherm measurements reported here show that non-trivial amounts of xenon adsorb on a variety of media, in addition to shale. A dual-porosity model is then discussed demonstrating that sorption amplifies the diffusive uptake of an adsorbing matrix from a fracture. This effect may reduce the radioxenon signature down to approximately one-tenth, similar to primordial xenon isotopic signatures.

journal_name

J Environ Radioact

journal_title

Journal of environmental radioactivity

authors

Paul MJ,Biegalski SR,Haas DA,Jiang H,Daigle H,Lowrey JD

doi

10.1016/j.jenvrad.2018.01.029

subject

Has Abstract

pub_date

2018-07-01 00:00:00

pages

65-72

eissn

0265-931X

issn

1879-1700

pii

S0265-931X(17)30773-7

journal_volume

187

pub_type

杂志文章

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