Authors:
K. Ahmad Ghana Atomic Energy Commission Department of Chemistry P.O. Box LG 80 Legon-Accra Ghana

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S. Dampare National Nuclear Research Institute Neutron Activation Analysis Laboratory of GHARR-1 Centre P.O. Box LG 80 Legon-Accra Ghana

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D. Adomako National Nuclear Research Institute Neutron Activation Analysis Laboratory of GHARR-1 Centre P.O. Box LG 80 Legon-Accra Ghana

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N. Opata National Nuclear Research Institute Neutron Activation Analysis Laboratory of GHARR-1 Centre P.O. Box LG 80 Legon-Accra Ghana

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R. Quagraine National Nuclear Research Institute Neutron Activation Analysis Laboratory of GHARR-1 Centre P.O. Box LG 80 Legon-Accra Ghana

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Abstract  

A set of rock and soil samples from Dome Beposo in the Amansie-West district of Ashanti Region of Ghana, suspected to contain gold, have been analyzed using instrumental neutron activation analysis (INAA) coupled with conventional counting techniques. The identification and quantification of the elements, gold, arsenic, mercury and antimony were done using 411.8 keV photopeak of 198Au, 559.1 keV photopeak of 76As, 77.3 keV photopeak of 197Hg and 564.2 keV photopeak of 122Sb. The precision and accuracy of the method were evaluated using standard reference materials. The precision and bias was found to be less than 6%. The first set of samples consists of ten rocks (GS), four of which retain moderate to quite high concentrations of gold, 0.27±0.01 mg/kg, 1.58±0.09 mg/kg, 7.51±0.44 mg/kg and 8.06±0.35 mg/kg, respectively. The second set comprises two soil samples taken from the upper and bottom layers of a gold exploration pit. Gold concentrations in upper (UL) and bottom (BL) layers are 0.06±0.002 mg/kg and 0.47±0.02 mg/kg, respectively. Arsenic was found in the soils as well as the rocks, and the levels ranged from 9.3±0.5 to 274±15.6 mg/kg. Mercury and antimony were found in the rocks only. Mercury levels in the rocks ranged between 0.11±0.004 and 9.67±0.42 mg/kg whilst antimony levels ranged from 0.21±0.01 to 6.88±0.38 mg/kg.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)