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The soil 222Rn concentration non-linear patterns are investigated by the application of various chaos methodologies based on 70 272 measurement data from the East Anatolian Fault Zone, which is one of the world's most active faults. Among these methodologies are Lyapunov exponent, surrogate data, rescaled range (R/S) analysis, Fourier spectrum, phase space reconstruction, mutual information, false nearest neighbors, and correlation dimension. The results indicate that the nonlinear dynamical approach is convenient for characterization and prediction of the 222Rn concentration dynamics, which are in turn usually used as an earthquake precursor. Behaviour of 222Rn gas is important in earthquake prediction researches. [ABSTRACT FROM AUTHOR]

The radon concentration has been measured in thermal waters used for medical therapy and drinking purposes in Yalova basin, Turkey. Radon activity measurements in water samples were performed using RAD 7 radon detector equipped with RAD HO (radon in water) accessory and following a protocol proposed by the manufacturer. The results show that the concentration of Rn in thermal waters ranges from 0.21 to 5.82 Bql with an average value of 2.4 Bql. In addition to radon concentration, physicochemical parameters of water such as temperature (T), electrical conductivity, pH and redox potential (E) were also measured. The annual effective doses from radon in water due to its ingestion and inhalation were also estimated. The annual effective doses range from 0.2 to 0.75 μSvy for ingestion of radon in water and from 2.44 to 9 μSvy for inhalation of radon released from the water. [ABSTRACT FROM AUTHOR]

In this study, the background radiation level of Elazığ region was determined. Indoor radon measurements were made with CR-39 track detectors and a total of 208 houses were screened. Average radon concentration was 98 Bq/m and effective dose value was 2.48 mSv/year. Gamma radiation in air was measured with a plastic scintillator at 214 points. Average indoor and outdoor absorbed dose values were 105.8 and 85.4 nGy/h, respectively. Radioactivity levels of water and soil samples were calculated with gross alpha and gross beta methods. Average gross alpha and gross beta radioactivity concentrations were calculated, respectively, as 0.091 and 0.037 Bq/L for drinking waters and as 289.7 and 143.2 Bq/kg for surface soil. [ABSTRACT FROM AUTHOR]

Abstract: Building materials contain natural radionuclides (238U, 232Th and 40K) and therefore cause direct radiation exposure to the public. The radioactivity content of samples obtained from building materials produced in Elazig city, East Anatolian of Turkey, have been analyzed by gamma-ray spectrometry. However, radium equivalent activities, total and annual effective dose rate and external (gamma), internal (alpha) hazard indexes were calculated and radon concentration, radon specific exhalation rate and effective radium content were measured. Also, indoor radon measurements carried out in each floor (uninhabited) of rough construction (newly construction). The specific concentrations of 238U, 232Th and 40K, from selected building materials, ranged from 3.5 to 114.1 Bq/kg, 1.6–20.7 Bq/kg and 201.4–4928.0 Bq/kg, respectively. The lowest of Raeq is 36.5 ± 1.8 Bq/kg calculated in bricks while the highest value is 405.2 ± 20.9 Bq/kg in gas concrete. The average indoor radon concentration is 364.3 Bqm−3, which is higher than the global mean value, in newly constructed floor. [ABSTRACT FROM AUTHOR]

Indoor radon activity level and radon effective dose (ED) rate have been carried out in the rural dwellings of Ezine (Çanakkale) during the summer season using Radosys-2000, a complete set suitable to radon concentration measurements with CR-39 plastic alpha track detectors. The range of radon concentration varied between 9 and 300 Bq m-3, with an average of 67.9 (39.9 SD) Bq m-3. Assuming an indoor occupancy factor of 0.8 and 0.4 for the equilibriuni factor of radon indoors, it has been found that the 222Rn ED rate in the dwellings studied ranges from 0.4 to 5.2 mSv y-1, with an average value of 1.7 (1.0) mSv y-1. There is a possibility that low radon concentrations exist indoors during the summer season in the study area because of relatively high ventilation rates in the dwellings. A winter survey will be needed for future estimation of the annual ED. [ABSTRACT FROM AUTHOR]