Appropriate NaI (Tl) Detector for Measuring Gamma-Ray Emitted from 137CS in Sea Water Using Monte Carlo Code MCNP.4C Simulation

The systems most commonly used for low level gamma radiation spectroscopyin seawater, arc based on nai (ti) dete ctors, which arc characteri zed by highdetectionefficiency and low cost. mcs is the most important radio activecontaminant , produ ced from the atmo spheric bomb tests, discharges from nucle arrepro cessing plant s, leakin g of concealed nuclear waste and in general of the sea(ocean). to select gamma ray of radio caesium count ing detector in the sea waternear bushehr nuclear power plant (b.n.p.p), mcnpac were used to simulate threedifferent dimen sions of(zin xz in (long