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Register a new userGeochemical Study of Radioactive Elements (Uranium, Thorium, and Potassium) in the Rocks of Latakia Sheet
دراسة جيوكيميائية للعناصر المشعة (اليورانيوم, الثوريوم, البوتاسيوم) في صخور رقعة اللاذقية
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Tishreen University ورقة بحثية
Publication date
2020
fields
Geology
and research's language is
العربية
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يتناول هذا البحث دراسة جيوكميائية للعناصر المشعة (اليورانيوم، الثوريوم، البوتاسيوم) في صخور مختلفة التركيب ضمن رقعة اللاذقية, حيث تم تحديد تركيز النّظائر المشعة 238U, Th232, 40K باستخدام جهاز كاشف الجرمانيوم عالي النقاوة, وجهاز التحليل الطيفي للأشعة السينية(XRD) لتحديد الأطوار الفلزية. بينت الدراسة وجود تباين في تركيز 238U, Th232, 40K في صخور منطقة الدراسة, ولوحظ أن النشاط الإشعاعي يرتبط بشكل رئيس بعنصر الثوريوم, ويرجع ذلك لوجود فلزات حاملة للثوريوم. يرجع انخفاض تركيز البوتاسيوم في معظم العينات لانخفاض نسبة فلزات الميكا والفلدسبار, أو فسادها إلى فلزات الإيليت, والمونتموريللونيت. دلت النسبة Th/Uعلى بيئة مرجعة ملائمة لترسيب اليورانيوم في معظم العينات الرسوبية, ويعزى ارتفاع هذه النسبة في عينات المعقد الأفيوليتي (باستثناء صخور السربنتينيت), نتيجة أكسدة وهجرة اليورانيوم من هذه الصخور باتجاه الصخور التابعة للتشكيلات الرسوبية, وثبات الثوريوم وعدم تأثره بالظروف المؤكسدة. بينت النسبة Th/ K سيطرة فلزي الإيليت والمونتموريللونيت في أغلب العينات, مع وجود فلزات حاملة للثوريوم المقاومة للتجوية في عينة البازلت, ورسوبيات بحيرة 16 تشرين. أظهرت الدراسة الفلزية وجود أطوار فلزية لليورانيوم, والثوريوم, بالإضافة إلى فلزات حاملة للعناصر المشعة كالمونازيت, والزركون.
This paper deals with a geochemical study of radioactive elements (uranium, thorium, and potassium) in rocks of different composition within the Latakia sheet, where the concentration of radioactive isotopes 238U, 232 Th, 40K was determined using a high-purity germanium detector, and an X-ray diffraction method-was (XRD) used to determine the mineral phases. The study showed a variation in the concentration of 238U, 232 Th, and 40K in the rocks of the study area, and it was observed that the radioactivity is mainly related to the element thorium, due to the presence of metals carrying thorium. The low concentration of potassium in most samples is due to the low percentage of mica and feldspar metals, or their corruption to elite and montmorillonite. The ratio Th/U indicated a suitable reference environment for deposition of uranium in most sedimentary samples, and this high percentage in the ophiolitic complex samples (with the exception of serpentinite rocks) is due to the oxidation and migration of uranium from these rocks towards rocks of sedimentary formations, and the stability of thorium and is not affected by oxidative conditions. The ratio Th/K indicated the predominance of elite and montmorillonite in most samples, with the presence of weather-resistant thorium-bearing metals in the basalt sample, and the sediments of Lake 16 October. The mineralogical study revealed the existence of mineral phases of uranium and thorium, in addition minerals carrying radioactive elements such as monazite and zircon
References used
Abbady, A; Ahmed,N. K; El-Arabi, A. M; Miche, R; El-Kamel, A. H; and Abbady, A. G. E; (2006). Estimation of radiation hazard indices from natural radioactivity of some rocks. Nuclear science and techniques،Vol. 17 No.2،pp.118-122
Yii, MW; Zaharudin, A; Abdul-Kadir, I; (2009) Distribution ofnaturally occurring radionuclides activity concentration in EastMalaysian marine sediment. Appl Radiat Isot 67:630–635
Papaefthymio, H; Athanasopoulos,D; Papatheodorou,G; Iatroub,M; Geraga,M;Christodoulou,D; Kordella,S; Fakiris,E;Tsikouras,B; (2013) Uranium and other natural radionuclides in the sedimentsof a Mediterranean fjord-like embayment, AmvrakikosGulf (Ionian Sea), Greece. J Environ Radioact 122:43–54
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In this work some of Uranium compounds have
been studied using B3LYB/SDDALL Basis set and electron
density theory (DFT), That is because of the high accuracy and
reliability for the results obtained.
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