Natural radioactivity and gamma dose from Sri Lankan clay bricks used in building construction
| Autor: | C.S. Sumithrarachchi, R. Hewamanna, H.L.C. Nanayakkara, H.C Ratnayake, P. Mahawatte |
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| Rok vydání: | 2001 |
| Předmět: |
Kiln
Population Potassium Radioisotopes chemistry.chemical_element Potassium-40 Radiation Dosage Effective dose (radiation) Radium Humans education Sri Lanka education.field_of_study Radionuclide Radiation Construction Materials Radiochemistry Thorium Gamma ray Spectrometry Gamma chemistry Air Pollutants Radioactive Gamma Rays Environmental science Equivalent concentration Clay Aluminum Silicates |
| Zdroj: | Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine. 54(2) |
| ISSN: | 0969-8043 |
| Popis: | The specific radioactivity concentrations of 226Ra, 232Th and 40K have been determined by gamma ray spectrometry with an HPGe detector in clay brick samples from kiln sites located in 17 towns. The average values of the measured activities are 35, 72, and 585 Bq kg(-1), respectively, for the above radionuclides. The average estimated radium equivalent concentration is 183 Bq kg(-1) and is comparable with reported values for many countries in the world. This value and the value obtained from the criteria formula suggest that the use of local clay bricks do not pose a radiological hazard. The calculated average absorbed dose rate in air within buildings was found to be 102 nGy h(-1) while the population weighted indoor annual effective dose was 0.20 mSv. |
| Databáze: | OpenAIRE |
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