title: [Development of a grain irradiator--relation between dimension of the irradiator and grain flow in irradiation region (author's transl)].
abstract: A grain irradiator was devised for the radiation disinfestation of rice. In this irradiator, dose of rice was varried through regulation of rice velocity in irradiation region. The velocity was regulated by variation of opening area and time of an annular gate valve setted at the bottom of the region. For the irradiator design, experiments of rice flow in the region were conducted by a pilot plant of the irradiator. The main results are as follows: (1) Flow rate of rice from slits of the valve independed on curvature of arrangement of the slits, (2) The flow rate was controlled within 2.7%, (3) Standard diviation of the velocity of a rice grain in an irradiation region was 1.8%, (4) Distribution of the velocity was uniform within 10% with no inclination of shutter of the valve to the slit, (5) Rice were not damaged by mechanical action of the irradiator.
mesh_terms: D005514:Food Irradiation / Q000379:methods*; D005720:Gamma Rays; D012275:Oryza