Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Przeglądasz jako GOŚĆ
Tytuł pozycji:

Behavior of uranium series in groundwater of the Wajid Formation, Wadi AdDawasir, Saudi Arabia.

Tytuł :
Behavior of uranium series in groundwater of the Wajid Formation, Wadi AdDawasir, Saudi Arabia.
Autorzy :
Ebaid YY; Physics Department, Faculty of Science, Fayoum University, Fayoum, 63514, Egypt. .
Nasr MM; Nuclear Material Authority, Cairo, Egypt.
Santos JKB; Technology Experts Company, Riyadh, Saudi Arabia.
Makhlouf O; Technology Experts Company, Riyadh, Saudi Arabia.
Pokaż więcej
Źródło :
Environmental monitoring and assessment [Environ Monit Assess] 2020 Aug 05; Vol. 192 (9), pp. 564. Date of Electronic Publication: 2020 Aug 05.
Typ publikacji :
Journal Article
Język :
English
Imprint Name(s) :
Publication: 1998- : Dordrecht : Springer
Original Publication: Dordrecht, Holland ; Boston : D. Reidel Pub. Co., c1981-
MeSH Terms :
Groundwater*
Radiation Monitoring*
Radium/*analysis
Uranium/*analysis
Water Pollutants, Radioactive/*analysis
Environmental Monitoring ; Gas Chromatography-Mass Spectrometry ; Saudi Arabia
Contributed Indexing :
Keywords: Groundwater; Radium; Uranium; Wajid Formation
Substance Nomenclature :
0 (Water Pollutants, Radioactive)
4OC371KSTK (Uranium)
W90AYD6R3Q (Radium)
Entry Date(s) :
Date Created: 20200807 Date Completed: 20200807 Latest Revision: 20200807
Update Code :
20201023
DOI :
10.1007/s10661-020-08518-5
PMID :
32757090
Czasopismo naukowe
The inventories and the possible mechanisms behind the relative deficiency of both radium and uranium release processes within an elevated gamma-anomalous rock were investigated. A field survey was performed on the highest radioactive anomalous zone that was recorded at Jabal Al Alam (20° 13' 10.06″ N and 44° 14' 32.13″), with the ferruginous sandstone, iron oxide band, and iron concretions (with uranium content and reaching up to1500 ppm). The chemical analyses and the laboratory's gamma-ray spectrometric measurements demonstrated high uranium levels in the analyzed rock samples of the Wajid Sandstone (up to 1000 ppm). The borehole geophysical logs further confirmed that the radioactive anomalies are attributed to the sandstone sequence of the Wajid Formation that is often found associated with elevated concentrations of uranium. The groundwater samples taken from the wells tapping the Wajid aquifer showed uranium concentrations ranging from 0.01 to 5.5 ppb (μg/L). The average 226 Ra in groundwater samples was 0.2 Bq L -1 . The majority of the 226 Ra and 228 Ra activities were below the lower limit of detection (LLD). The radiochemical analyses of water samples from the Wajid aquifer display low concentrations of both uranium and 226 Ra, with relation to uranium content in host rocks. This was attributed to the fact that uranium is susceptible to form iron oxide complexes, causing them to precipitate in a more stable form. Furthermore, iron oxides coat the sand grains of the Wajid Formation and accordingly might act as a foundation for re-adsorption for both uranium and radium, resulting in their relative deficiency in the surrounding water. The coating might also act as a physical barrier resulting in hindrance of the recoil nuclei due to its significant thickness (several orders of magnitude) compared with that of the average (120 nm) whole alpha-recoil track (ART). The coating layer thickness was determined via scanning electron microscopy (SEM) and was found to be up to 180 μm.

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies