Description
Full text: Radioactive minerals such as uraninite, UO2, thorianite, ThO2, thorite, ThSiO4, and the like have been valuable for their uranium and thorium contents which are becoming important energy resources today in many countries where atomic reactors are used. They are also essential ingredients in modern weapon industries for the manufacture of devastating weapons. Uraninite is the chief source of uranium although other minerals are important sources of the element such as carnotite, K2(UO2)2(VO4).3H2O, Tyuyamunite, Ca(UO2)2(VO4).5-8 1/2 H2O, torbernite, Cu(UO2)2(PO4)2.8-12H2O,and autunite (Hurlbut et.al, 1977). Th can substitute for U and a complete series between uraninite and thorianite occurs. Analyses usually show the presence of small amounts of Pb, Ra, Ce, Y, N, He and A. Lead occurs as one of two stable isotopes (Pb206 and Pb207) which result from the radioactive decay of uranium (Hurlbut et.al. 1977). According to Bill Morton, a pioneer in the study of Ethiopian Minerals and Rocks, there are a number of radioactive minerals in Ethiopia, with varying physical properties. The presence of the radioactive minerals can easily be detected using a geiger counter or scintillation counter.These radioactive minerals are mainly found in small amounts in pegmatites and in some sandstones reported from the Hararghe area, south-eastern Ethiopia. Uraninite occurs in a form of pitchblende, which is massive with a banded structure. To date no extensive radioactive mineral deposits have been discovered in Ethiopia. Besides the Uranium and thorium minerals observed in pegmatite veins belonging to gneisses of Hararge, Precambrian granite as well as Cretaceous and Jurassic sediments in the same region, i.e., south eastern Ethiopia, particularly in the Dire-Dawa – Harar area, seem to be favorable host rocks for radioactive minerals (Getaneh Assefa, 1992). There are also reports of occurrences of radioactive minerals in Sidamo (Wadera, Zenbaba and Genale localities), Kaffa, Illubabor and Wollega administrative regions. Much of the country has been examined by geologists, but it would be premature to say that there are no further deposits of useful minerals awaiting discovery. Only a comparatively small part of the country has been geologically mapped so far on a systematic basis. Geologic maps at scales of 1:100,000 to 1:25,000 should be prepared for areas where mineral deposits are to be prospected for and where known deposits are to be developed or exploited. At present the best available geological map is one at a scale of 1:250, 000. This and other programs of mineral exploration basically call, among others, for: – Equipment and funds from bilateral, multilateral and local sources; – A national program geared towards uranium mineral exploration; – Heavy investment in infrastructure to get to many of the deposits, which are located in remote parts of the country; – International and regional cooperation in uranium mineral resources research. Finally, participation in international conferences such as this organized by the IAEA will give us, researchers in developing countries, good impetus to get moving and do useful research in uranium exploration and its uses. Research collaboration with scientists in the developed world is very essential to accelerate forward the creeping research in developing countries. (author)
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Imprint TitleInternational symposium on uranium production and raw materials for the nuclear fuel cycle – Supply and demand, economics, the environment and energy security. Extended synopsesImprint Pagination352 p.Journal Page Rangep. 292-293
