Estimation of Mass Absorption Coefficient for Some Standard Geological Materials Using Incoherent Scattering Intensity of W, Mo ,Cr and Au X-ray Tube Line | ||
| Kirkuk Journal of Science | ||
| Article 1, Volume 11, Issue 2, June 2016, Pages 1-18 PDF (0 K) | ||
| DOI: 10.32894/kujss.2016.124519 | ||
| Authors | ||
| Ahid Y. Al-Mallah; Salim M. Aldabbagh | ||
| Abstract | ||
| ABSTRACT The analysis of trace element by x -ray fluorescence spectrometry always required appropriate correction for matrix differences of the geological material . To reduce such effect , mass absorption coefficient were calculated for both known (standards) and unknown samples. Such calculation required analytical data of major element concentration (wt. %) . To make these data available, is in fact time consuming job. Many theoretical and experimental corrections were attempted in order to save this additional analytical work . The uses of incoherent scatter intensity dominate the relevant literature , because it is free of systematic errors affecting the measurements of incoherent scatter intensity. Non of the published attempt claimed routine uses of the suggested method of correction. The present study deals with estimation of mass absorption coefficients of ten international geological standards for wave length range ( 0.50A - 1. 66A ) using intensity (counts /40 seconds) of(GH;Mica-Fe;ATT-1;SY-2;ASk-1; ASk-2; BX-N; UM-2;UM-4;MRG-1) incoherent scatter (I incoh) lines ( Au Lβ , Cr kβ , Mo Kα , Mo Kβ , W Lβ1 , WLβ2 ) reflected from smooth surface of infinity thick pellets prepared from standards samples powders Appropriate computer program were previously written and checked then , later used for computation of mass absorption coefficients () of the standards samples. Sequential x-ray spectrometer (PW1459/10) were used for measurements of incoherent Scatter (I incoh). The inverse relation between (I incoh -) can be explained on the basis of low rate of incoherent scatter generation from sample matrix of high mass absorption coefficient . Same matrix can absorb great deal of departed x-¬ray from the samples . The curved relation is confined to Mo Kα and Mo Kβ incoherent line resulted from the nature of the spectrometer pw 1450/10 used in this study. Comparison between different incoherent reflection lines were made and the whole data was subjected to additional mathematic and statistical treatments for improvement of results . | ||
| Keywords | ||
| mass absorption coefficient; trace element; ray fluorescence spectrometer; incoherent scatter; systematic errors | ||
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