Distribution of 238U, 232Th and 40K in plutonic rocks of Greece |
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| Institution: | 1. Department of Mineralogy, Petrology and Economic Geology, School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;2. Laboratory of Nuclear Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. College of Resources, Environment & Tourism, Capital Normal University, 100048 Beijing, People’s Republic of China;2. Shisanling Seismic Station, Institute of Earthquake Science, CEA, 102200 Beijing, People’s Republic of China;3. Beijing Jing Yuan School, 100040 Beijing, People’s Republic of China;4. School of TaiPingqiao, Nan Lu of West Railway Station, 100073 Beijing, People’s Republic of China;5. Key Laboratory of Tourism and Resources Environment in Universities of Shandong, Taishan University, 271000 Tai’an, People’s Republic of China;1. National Public Health Center National Research Directorate for Radiobiology and Radiohygiene, H-1221, Anna u. 5., Budapest, Hungary;2. Hungarian Atomic Energy Agency, H-1036, Fényes Adolf u. 4., Budapest, Hungary;3. International Atomic Energy Agency, A-1400, PO Box 100, Vienna, Austria |
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| Abstract: | One hundred and twenty one samples from every major plutonic body (mainly granitic) of Greece have been analyzed by γ-ray spectrometry to determine the specific activities of 238U, 232Th and 40K (Bq/kg). The range of the activity concentrations of these radionuclides was 2.3–266.4, 1.8–375.5 and 55.0–1632.0 Bq/kg and their average values were 79.2, 85.3 and 881.4 Bq/kg respectively. Any possible connection between the specific activities of 238U, 232Th and 40K and some characteristics of the studied samples (age, rock-type, colour, grain-size, occurrence and chemical composition) is investigated. Samples of particular colour, rock-type, occurrence and chemical composition have been identified for their distinctive levels of natural radioactivity, while age and grain-size do not affect the concentrations of 238U, 232Th and 40K. The range of the Th/U ratio was 0.7–12.69. This great variation in the Th/U ratios, especially when it is found among the samples of the same pluton, is also discussed and explained by alteration and tectonic–metamorphic processes. |
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| Keywords: | Granite Hydrothermal activity Natural radioactivity Uranium Thorium |
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