English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The radioactive noble gas radon-222 ($\mathrm{^{222}Rn}$, or Rn) produced inthe uranium series is a crucial background source in many undergroundexperiments. We have estimated the adsorption property of Rn with ActivatedCarbon Fibers (ACFs) in air (Air), argon (Ar), and xenon (Xe) gas. In thisstudy, we evaluated six ACFs, named A-7, A-10, A-15, A-20, A-25, and S-25,provided from UNITIKA Ltd. We measured intrinsic radioactivity of these ACFsamples, and found A-20's radioactivity of the uranium series is$<5.5$~$\mathrm{mBq/kg}$ with $90\%$ confidence level. In Air and Ar gas, wefound ACF A-15 has the adsorption efficiency of $1/10000$ reduction at maximumbefore saturation of Rn adsorption, and more than $97\%$ adsorption efficiencyafter the saturation. In Xe gas, we found ACF A-20 has the best Rn adsorptionability among tested ACFs. We also found S-25, A-25, and A-15 have similar Rnadsorption performance.

Evaluation of radon adsorption efficiency values in xenon with activated carbon fibers