Natural and anthropogenic radionuclides in the granitic region of Kapidag peninsula, Western Anatolia, Turkey
| Autor: | M. Okka, A. Varinlioglu, Serdal Karahan, Enis Kapdan, S. Kiziltas, Gonca Karahan, Halit Eren Taskin |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Radioisotopes
Anthropogenic radionuclides Radionuclide geography Radiation geography.geographical_feature_category Turkey Radiological and Ultrasound Technology Public Health Environmental and Occupational Health chemistry.chemical_element General Medicine Silicon Dioxide Radium chemistry Radiation Monitoring Gamma dose Peninsula Absorbed dose Environmental chemistry Background Radiation Soil Pollutants Radioactive Environmental science Radiology Nuclear Medicine and imaging Soil Pollutants Natural radioactivity |
| Zdroj: | Radiation Protection Dosimetry. 150:448-457 |
| ISSN: | 1742-3406 0144-8420 |
| Popis: | Naturally occurring radionuclides of terrestrial origin (also called primordial radionuclides) are present in various degrees in all media in the environment. This study represents the reports on the natural and anthropogenic radionuclides in the Kapidag granitic region. For this purpose, activities of radionuclides in soil, beach sands and rocks of the region have been investigated to assess the radiological hazard of the natural radioactivity. The radium equivalent activities, the absorbed dose rates and the external hazard indexes have been calculated, and also in situ gamma dose rates have been measured in the region. The mean activities of (238)U, (232)Th and (40)K with the ranges were determined as 31.1±15.7 (12.1-71.9), 42.5±15.9 (19.7-94.9), 590.3±192.2 (184.7-892.5), in the soil, as 16.5±9.5 (4.9-40.8), 67.1±106.9 (18.5-433.0), 569.2±212.6 (162.0-821.1) in the sand and as 25.4±12.8 (4.8-50.7), 37.8±21.5 (4.5-96.7), and 592.4±285.5 (62.4-1121.6) Bq kg(-1) in the rocks, respectively. It was also observed that the average activities of (137)Cs were ranged 0-27.8 Bq kg(-1) in the soil and 0.6-3.8 Bq kg(-1) in the beach sands. The mean Ra(eq) activities of the rocks, sands and soil were found to be 125.1±59.5, 156.3±157.2 and 137.3±48.8 Bq kg(-1), respectively, lower than the recommended maximum value of 370 Bq kg(-1) with some exceptions. The maximum contributors to the total absorbed gamma dose rates in air were determined as (238)U (45%) for the beach sands, (238)U (40%) for the soil and (40)K (41%) for rocks. The average outdoor gamma dose rates for the soil due to terrestrial and cosmic radiations were found to be 64.6±22.7 and 47.1±9.6 nGy h(-1), respectively, with the total of 111.7±29.5 nGy h(-1) outdoor gamma exposure rate and the annual average effective outdoor gamma dose was calculated as 137±36.2 µSv for the region. The results of the study were discussed with similar studies in close regions and the worldwide averages. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|