SPECTROMETRIC AND RADIOMETRIC TECHNIQUES OF NUCLEAR RADIATIONS IN THE ASSESSMENT OF ENVIRONMENTAL RADIOACTIVITY

The paper contains a synthesis of research results in the study of the level of environmental radioactivity obtained by using spectrometric technique, of high precision and high sensitivity, of atomic and nuclear radiations. Spectrometric technique were used to measure gamma nuclear radiation in determining the radioactivity of ash samples taken from the dumps of the ROMAG TERMO Drobeta Turnu Severin thermal power plant, Mehedinți county. By gamma spectrometry with high energy resolution semiconductor detector, high efficiency and protection for the cosmic radiation background (low radiation background) was determined the radioactivity of ash samples, taken from two coal dumps from ROMAG TERMO Drobeta Turnu Severin power plants, Romania. The results showed that the activities of the main radionuclides in the environmental samples including, 228Ac (7.5 ÷ 18.7 Bq/kg), 226Ra (6.2 ÷ 21.3 Bq/kg), 137Cs (0.3 ÷ 1, 53(Bq/kg) and 40K (169 ÷ 362 Bq/kg) are among the lowest values found compared to the maximum allowed limits.