Monte Carlo simulation of gamma-ray spectra from natural radionuclides recorded by a NaI detector in the marine environment.
The GEANT4 Monte Carlo code has been used to simulate gamma-ray spectra of natural radionuclides collected by a NaI scintillation detector immersed in seawater. The gamma-rays emitted from the decay of (40)K, and the series of (232)Th and (238)U, were used to describe the radioactive water source around the NaI crystal. The simulated gamma-ray spectra were compared with real data recorded in situ by a newly constructed NaI spectrometer and were found to be in good agreement. The NaI spectrometer was calibrated in the laboratory in a water tank, before its deployment in seawater. Activity concentrations were deduced from the gamma-ray spectra and discussed in comparison with results from the literature.
Vlastou
R
R
Department of Physics, National Technical University of Athens, 157 80 Athens, Greece. vlastou@central.ntua.gr
Ntziou
I Th
IT
Kokkoris
M
M
Papadopoulos
C T
CT
Tsabaris
C
C
D003198:Computer Simulation; D005720:Gamma Rays; D007452:Iodates; D009010:Monte Carlo Method; D011834:Radiation Monitoring / Q000379:methods*; D011868:Radioisotopes / Q000032:analysis*; D012623:Seawater / Q000737:chemistry*; D013051:Spectrometry, Gamma; D013057:Spectrum Analysis
D007452:Iodates; D011868:Radioisotopes; C032285:sodium iodate