Authors: C Bagatelas C Tsabaris M Kokkoris C T Papadopoulos R Vlastou 
              Publish Date: 2009/05/07
              Volume: 165, Issue: 1-4, Pages: 159-168 
			  
              Abstract
              Monte Carlo simulations were performed using the GEANT4 code for the investigation of γray absorption in water in different spherical geometries and of the efficiency of a NaITl detector for different radionuclides in the aquatic environment In order to test the reliability of these simulations experimental values of the NaITl detector efficiency were deduced and seem to be in good agreement with the simulated ones In addition using the simulated efficiency an algorithm was developed to determine the minimum detectable activity in becquerels per cubic meter in situ as a function of energy for typical freshwater and seawater spectra
              
			  Keywords: