In this work, sensitivity analysis of the dead layer thickness by using change of thickness class died in the model to performance recognition of probes with multiple sources of gamma-emitting isotopes with energy from 50keV to 2200 keV with the shapes of different sources. Monte Carlo method MCNP5 code used with combination with results compared with measured values from experimental. In point source, the author uses two line method in the determination of the thickness layer of dead at different times
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