摘要：Buildup factor is an important parameter in the design of a radiation shielding system. As a manufacturing material commonly used for nuclear equipment, type 316 stainless steel is selected as the research object of this article. Exposure geometric progression fitting parameters and the corresponding exposure buildup factor (EBF) are calculated for type 316 stainless steel in the photon energy range of 0.015 MeV - 15 MeV, as well as penetration depth up to 40 mean-free-paths (mfp), and studied as a function of the photon energy and penetration depth. It can be observed that EBF changes significantly with the photon energy and penetration depth. These changes are attributed to the dominant interaction process in different photon energy regions. Besides, EBFs of 1.17 MeV and 1.33 MeV are interpolated using the obtained data and compared with those from the MCNP5 simulation by introducing a co-concentric multi-layer model, respectively. The results obtained from the Geometric Progression method are consistent with those calculated by the MCNP5 code. Buildup factors for type 316 stainless steel obtained in this article can be used as a reference for shielding performance assessment of the equipment made of type 316 stainless steel.
