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  • 2203.10147

    Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Instrumentation. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/1748-0221/17/11/P11022

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    Embargo ends: 16/11/23

    Available under license: CC BY: Creative Commons Attribution 4.0 International License

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Observation of Radon Mitigation in MicroBooNE by a Liquid Argon Filtration System

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
Article numberP11022
<mark>Journal publication date</mark>16/11/2022
<mark>Journal</mark>Journal of Instrumentation
Issue number11
Volume17
Number of pages17
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The MicroBooNE liquid argon time projection chamber (LArTPC) maintains a high level of liquid argon purity through the use of a filtration system that removes electronegative contaminants in continuously-circulated liquid, recondensed boil off, and externally supplied argon gas. We use the MicroBooNE LArTPC to reconstruct MeV-scale radiological decays. Using this technique we measure the liquid argon filtration system's efficacy at removing radon. This is studied by placing a 500 kBq $^{222}$Rn source upstream of the filters and searching for a time-dependent increase in the number of radiological decays in the LArTPC. The liquid argon filtration system was able to remove greater than 99.999% of the radon injected into the system. Furthermore, a radiological survey of the filters found that the copper-based filter material was the primary medium that removed the $^{222}$Rn. This is the first observation of radon mitigation in liquid argon with a large-scale copper-based filter and could offer a radon mitigation solution for future large LArTPCs.

Bibliographic note

This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Instrumentation. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/1748-0221/17/11/P11022