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 present study is an application of a radiochemical procedure for the determination of  238 U,  235 U and  234 U as well as uranium isotopic ratios in El Sela ore grade samples that located at the Southeastern Desert of Egypt. This procedure is consisting of several steps include sample preparation, chemical separation and source preparation followed by counting using alpha-particle spectrometry technique. Radiochemical determination of various uranium isotopes contents indicated that El Sela uranium deposits are considered as a recent deposit where there was a large difference between radiochemically and radiometrically determined uranium. The measured  234 U/ 238 U activity ratios for most samples were approximately unity, indicating that secular radioactive equilibrium was established between  238 U and  234 U in the El Sela mineralised rocks. On the other hand,  238 U and  234 U might be equally leached due to the effect of rock-water interactions during the pluvial time by the action of surficial or underground water. The  238 U/ 235 U activity ratios of the studied mineralised granites were significantly shifted from the natural ratio 21.7, indicating that the redox conditions and alteration processes played an important role in the fractionation of  238 U from  235 U. The values of  234 U/ 235 U ratios in the studied granites varied between 23.08 and 34.70 in different samples, suggesting  235 U migration out due to the prevailing conditions.

Radiochemical technique as a tool for determination and characterisation of El Sela ore grade uranium deposits