An Optimized Quantification Method for Marine Radioactivity Measurements: Application in the Southern Caspian Sea Using the KATERINA Underwater γ-Spectrometer

The underwater gamma-ray spectrometer KATERINA was calibrated in a special tank and then demonstrated the Southern Caspian Sea to determine radioactivity levels seawater as well sediment. simulated marine efficiency of situ detection system validated analyzing high energetic (1764 keV 214Bi 2614 208Tl) peaks using their known activity concentration determined from low energy emissions. analysis spectra short acquisition time period provided quantitative data for 226Ra 232Th progenies 40K. A satisfactory performed quantifying observed sediment measurements acquired at south coast Sea. spectrum water also analyzed full methods, reproduced very good agreement with experimental giving an output concentrations radionuclides.