Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

Measurements of mono-energetic fast neutron transmission ratio, based on an electro-static accelerator, a neutron generating reaction, a liquid scintillation detector and a pulse discrimination method, were performed to estimate the feasibility of the determination method of total porosity in geological model samples. These samples were fabricated by the silica cylindrical holders containing silica rods of various sizes and sands. Total porosities were determined by comparing weights of sample in wet condition with those in dry condition, and they were compared with the ones obtained by the fast neutron transmission ratios which were calculated by Monte-Carlo Neutron transport Process(MCNP) code as a function of total porosity. The results show good agreements with deviations of 0.3%～8.4% between measured porosities and the ones obtained by the fast neutron transmission ratio method when neutron energy of 2 MeV was used. The large difference in porosities might be resulted from inhomogeneity of porosities in sample.