| dc.description.abstract | A total of fifty three radioactive fluorite samples
from Kerio valley and Mrima Hill were analysed using Energy
Dispersive X-ray Fluorescence (EDXRF) method. The excitation
source used was Cadmium 109 and a silicon-lithium drifted
(Si(Li)) detector.
A Quantitative analytical approach based on
Fundamental Parameter method has been used in the analysis
of these samples.
Concentrations of uranium,thorium and other elements
of probable economic values are also reported.
Frequency histograms for elemental distributions in
these samples are also.presented. A correlation matrix of . .
uranium and thorium with the associated elements is also
established.
In order to illustrate the accuracy of EDXRF method,
analysis of certified reference materials;soil(S-7),
uranium ore (S-8) and thorium ore (S-14) from the
International Atomic Energy Agency:(IAEA) and the Canadian
rock sample (SY3) has been performed and results obtained
compared with the certified values. Errors of orders of 5%
and 10% have been realised on major and trace elements,
respectively.
The results of repeatability of the EDXRF method
performed on selected samples from Kerio Valley and
Mrima Hill are also reported. | en |
