Potassium from Coals and its Contribution to Their Radioactivity

摘要

The emitted radiation problem of the natural radionuclides represents an important study of what it means the prevention and the control of the environmental pollution. The research deals with the distribution ottne radionuclide _(19)~(24)K in coals and in ashes resulted by their burning. Series of mineral coals, in different stages of carbonizations, of Romania's main regions, have been studied. The researches performed leaa to the conclusion that in the material extracted torn mine with approximate 30% sterile, the radionuclide _(19)~(24)k is placed at 50 -60 ppm level and in ashes at 150-180 ppm. The researches show that in the case of coals even at an approximate 30% content of ashes, the radioactive pollution is not too risky. It would be useful that, from exploitation, the coals could be extracted from thick layers with a reduced content ot associated minerals. Among the minerals associated to the coals, the clays represent the main factor of concentration of _(19)~(24)K element. The biggest content of clays from lignites is the element which enriches the coal extracted in potassium and also in its isotopes. The ashes resulted from the burning of coals have contents ot 150 -180 ppm in , _(19)~(24)K a very important aspect for their utilisation or depositing. The study attempts to resolve some aspects linked to the problems of the coal radioactivity and also of ashes resulted by it's burning.