Estimation of Exposure Buildup Factor in Iron Using Different Methods: A Comparative Study

The gamma exposure buildup factor in iron is computed by using different methods of GP fitting method, invariant embedding, a simulation program written by Monte Carlo method to calculate this factor and MCNP4C code. Coherent scattering effect on this factor it has been studied as well. The results are obtained in the energy range 0.1-10 MeV and penetration depths up to 25 mfp and the result are compared with GP fitting method.