Ej. Uwah et Rj. Rosenberg, MEASUREMENT OF RADIOELEMENT CONTENTS OF ROCKS OF UGEP, SE NIGERIA, BYGAMMA-RAY SPECTROMETRIC AND INSTRUMENTAL NEUTRON-ACTIVATION ANALYSIS TECHNIQUES, Applied radiation and isotopes, 44(5), 1993, pp. 855-858
Citations number
12
Categorie Soggetti
Nuclear Sciences & Tecnology","Radiology,Nuclear Medicine & Medical Imaging
A combination of gamma-ray spectrometry and instrumental neutron activ
ation analysis is adopted in the quantitative evaluation of the three
major radioelements (U, Th and K) concentrations in some rock samples
collected at previously delineated radiometric anomalies (Geological S
urvey of Nigeria, 1976), in the Ugep area of the Lower Benue Region of
Nigeria. A preferential enrichment of Th to U and K is observed in mo
st samples analysed, with U/Th ratios ranging from 0.11 to 0.25. K con
tents are fairly normal in some samples analysed, with Th (ppm)/K (%)
ratios ranging from 2 to 5. Anomalous Th/K ratios, Th (ppm)/K (%) rati
os ranging from 2 to 5 up to 16, were obtained for samples from those
areas identified in the airborne survey maps as ''Th-anomaly zones'' (
Geological Survey of Nigeria, 1976).