کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
583219 | 1453172 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Separation and subsequent determination of low radioactivity levels of radium by extraction scintillation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
A method is developed for separation and subsequent determination of low 226Ra levels based on its extraction efficiency by various organic extractants followed by direct interaction with mixed scintillation cocktail (SC) in toluene as the most suitable solvent. Three organic extractants including Tricaprylmethyleammonium chloride (Aliquat-336), triphenylphosphine sulphide (TPPS) and tri-n-octylphosphine oxide (TOPO) are individually embedded in 1-phenyl,4-phenyloxazole (PPO) as a primary scintillator and 1,4-di-2-(4-methyl, 5-phenyl oxazoyl) benzene (POPOP) as a second scintillator. Different parameters affecting the extraction process including shaking time, type and concentration of extractant, aqueous/organic volume ratio as well as various levels of 226Ra are individually investigated. Based on the optimized condition, it was found that the extraction of 226Ra by Aliquat-336 is highly selective with efficient separation capability from 133Ba, which is necessary to determine the yield and recovery of 226Ra in related measurements. The combination of extraction with direct scintillation processes is mainly elaborated to overcome the heterogeneity problem and hence the slow scintillation rate that often exists in conventional liquid scintillation counting especially with low radioactivity levels.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 156, Issues 1â3, 15 August 2008, Pages 123-128
Journal: Journal of Hazardous Materials - Volume 156, Issues 1â3, 15 August 2008, Pages 123-128
نویسندگان
E.H. Borai, Y.F. Lasheen, E.A. El-Sofany, A.A. Abdel-Rassoul,