Within the framework of the National Marine Geological and Geophysical Program, we re‐examined deep vertical electrical sounding (VES) data. The data, measured in 1968 by the General Directorate of Mineral Research and Exploration (MTA) of Turkey with the aim of exploring the deep resistivity structure of the Dikili–Bergama region, focus on the geothermal potential. The geoelectrical resistivity survey was conducted using a Schlumberger array with a maximum electrode half‐spacing of 4.5 km. The two‐dimensional (2D) inversion was utilized to interpret the VES data that were collected along 15‐ to 30‐km profiles. The 2D resistivity–depth cross‐sections obtained show very low resistivity values near the Dikili and Kaynarca hot springs. The 2D inversion results also indicate the presence of fault zones striking nearly N–S and E–W, and fault‐bounded graben‐horst structures that show promising potential for geothermal field resources. The 2D gravity model, which is in good agreement with the density variation of the region, supports the resistivity structure revealed by 2D inversion. The lithology information obtained from the borehole near Kaynarca also confirms the results of the resistivity interpretation and the density model.

Natural activity concentrations in water sources are necessary to assess the effects of exposure to environmental radiation. The purpose of this study is to determine the activity concentrations of gross a and b in various water samples collected from 30 different locations in Karaman province, Turkey. The estimated values of activities of gross a and b obtained from water samples vary from 0.006 to 0.125 Bq L-1 and from 0.001 to 0.667 Bq L-1 , respectively. The gross b activities have been found always higher than the corresponding gross a activities for all samples. The obtained values indicated that concentration levels of a and b emitting radionuclides in samples have not exceeded WHO recommendations. The results represented here that the AED values are below of recommended reference level (0.1 mSv year-1) by the WHO for all water samples in this study.

A screening of natural radioactivity content has been carried out in thermal water samples collected from surrounding of Central Anatolia, Turkey. The concentration levels of gross alpha and beta of 19 different samples has been determined using the low background gas-flow proportional counter. The measured gross alpha and beta activities in waters range from 0.11 to 16 Bq/L and 0.10 to 16.9 Bq/L, respectively. The measured values of gross alpha and beta concentrations are compared to previous studies in the literature and recommend WHO guideline activity concentration. The data resulting from the measurement have been statistically analyzed.

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