Applied Research in the Trenches Directional γSpectroscopy Detection Techniques Based on MCNP

When γspectrometry in the trenches, and the measurement results will be influenced from the γspectrometry around the mine, the measurement results do not reflect its true value.In order to obtain more re-alistic value, in this paper, though the simulation program by MCNP spectrum ofγouter shield settings under different material, thickness and shape, the final results with a thickness of 1 cm lead shielding body and the structure uses a cylindrical shape shield.While using a different source term settings, the transmission coeffi-cient obtained under different energy segments, obtained optimal results, providing value for future mine under Spectrometry.