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 new Super-Kamiokande-Gadolinium (SK-Gd) project is an upgrade of theSuper-Kamiokande (SK) detector. In the SK-Gd project, 0.2\% Gd$_2$(SO$_4$)$_3$is loaded into the 50 kton water tank of the SK. One of the main purposes ofthe project is to discover Supernova Relic Neutrinos. Neutrino measurements andproton decay searches will also be performed in the SK-Gd. In order to measuresolar neutrinos with a low energy threshold of $\sim$3.5 MeV in the SK-Gd, themain radioactive contaminations, $^{238}$U and $^{232}$Th, inGd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O, should be minimized before loading. Ourmaximum levels for U and Th are 5 mBq (U)/kg (Gd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O)and 0.05 mBq (Th)/kg (Gd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O).  In order to measure such low concentrations of U and Th inGd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O, we developed the solid-phase extractiontechnique. Using this method, about 90\% or more U and Th could be efficientlyextracted while Gd was reduced by a factor of about $10^{4}$. This allowedthese radioactivity contaminations to be measured precisely as 0.04 mBq/kg(Gd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O) for U and 0.01 mBq/kg(Gd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O) for Th. We measured three pureGd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O samples using this method and estimated thatthe purest one contained $<0.04$ mBq (U)/kg (Gd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O)and 0.06 $\pm$ 0.01 mBq (Th)/kg (Gd$_2$(SO$_4$)$_3{\cdot}$8H$_2$O) by ICP-MS.

progress of theoretical and experimental physics

Determination of Trace Levels of Uranium and Thorium in High Purity  Gadolinium Sulfate Using ICP-MS with Solid-Phase Chromatographic Extraction  Resin