Determination of the concentration of uranium in geochemical samples
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Date
1981-04
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Turkish Atomic Energy Commission
Abstract
Farklı miktarlarda demir içeren jeokimyasal örneklerde uranyum konsantrasyonunu yüksek resolusyonlu Si(Li) yarı-iletken dedektörü kullanarak X-ışını fluoresans analiziyle tayin etmede en önemli faktörlerden bir tanesi Compton saçılma radyasyonundan faydalanılarak matris soğurma etkisinin düzeltilmesidir. Uranyumun kendine özgü U LαX-Işınları Molibden ve Palladyum K X-Işınları ile uyarıldı. U Lα ve U Lβ X-ışınlarının şiddeti uranyum konsantrasyonunun fonksiyonu olarak bulundu. Compton saçılma radyasyonuna göre X-ışın şiddetlerinde yapılan düzeltmeyle matris soğurma etkisi ortadan kaldırıldı. Uranyum Lα X-ışınları ile uyarılmasında 280 ppm uranyum içeren örneklerde regresyon analiziyle bulunan hata ± 25 ppm olmuştur. Bu hatanın 11 ppm sayım istatistiğinden kaynaklanmaktadır. Uranyum L X-ışınlarını uyarmada Pd K X-ışınları kullanıldığı zaman bu hata 17 ppm kadar çıkmıştır.
Corrections for matrix absorption in energy-dispersive X-ray fluorescence analysis based on the measurement of Compton scattered radiation using a high resolution Si(Li) semi-conductor dedector is one of the important factor for the determination of the concentration of uranium in geochemical samples containing different concentrations of iron. Characteristic Uα and U Lβ X-rays were excited by Mo and Pd K X-rays. Intensities of U Lα or U Lβ X-rays were measured as a function of uranium content. Correction for Compton scatter intensities minimized the matrix absorption effects. The error by regression analysis when using Mo K X-rays to excite U Lα X-rays in samples containing up to 280 ppm uranium was ± 25 ppm of which up to 11 ppm was due to counting statistics. When Pd K. X-Rays were used to excite U Lβ X-rays the error was up to 17 ppm.
Corrections for matrix absorption in energy-dispersive X-ray fluorescence analysis based on the measurement of Compton scattered radiation using a high resolution Si(Li) semi-conductor dedector is one of the important factor for the determination of the concentration of uranium in geochemical samples containing different concentrations of iron. Characteristic Uα and U Lβ X-rays were excited by Mo and Pd K X-rays. Intensities of U Lα or U Lβ X-rays were measured as a function of uranium content. Correction for Compton scatter intensities minimized the matrix absorption effects. The error by regression analysis when using Mo K X-rays to excite U Lα X-rays in samples containing up to 280 ppm uranium was ± 25 ppm of which up to 11 ppm was due to counting statistics. When Pd K. X-Rays were used to excite U Lβ X-rays the error was up to 17 ppm.
Description
Keywords
Geochemical samples, Jeokimyasal numuneler, Concentration of uranium, Uranyum konsantrasyonu, Determination, Belirleme
Citation
Bilge, A. N. (1981). Determination of the concentration of uranium in geochemical samples. Turkish Journal of Nuclear Sciences, 8(1), 9-14.