Abstract: In order to verify the feasibility ofMCNP for calculating the internal dose rate of an electron beam ammonia desulfurization vessel, the principle of “pinhole imaging" is employed to simulate an electron accelerator with energy of 0.57 MeV. The dose rate is then calculated, and compared with experimental measurements in the literature and the simulationvalues with the EGS4 program. It shows that the MCNP program calculation resultsat 25.7% error are consistent with those from the EGS4 program simulation.

Key words: EA FGD, Pinhole imaging, Monte Carlo method