PREPARATION OF RADIATION SHIELDING GRID PLATE

PURPOSE:To easily obtain shielding effect with high accuracy and to enhance assembling work efficiency by forming a material having high radiation absorptivity into a fine powdery form to mix the same with a resin and a curing agent and casting the resulting mixture in a mold to cure the same. CONSTITUTION:A material having high radiation absorptivity is formed into a fine powdery form and this fine powder is mixed with a resin and a curing agent to prepare a mixture 1 which is, in turn, cast in a mold to be cured. For example, an upper substrate 4 having an opening part 3 formed to the central part thereof is placed on a lower substrate 2 to form such a mold that the protruding parts 6 of the substrate 2 are arranged within the opening part 3. The mixture 1 is cast in this mold to uniformly fill the mold. The fine powder of the mixture 1 is obtained from a material excellent in radiation shielding effect such as a lead compound, tungsten or a tungsten compound. This fine powder is mixed with a thermosetting or photo-setting vinyl or epoxy type resin and a curing agent to prepare a creamy composition. The mixture 1 is cured by heat or light to be demolded from the mold. A grid plate having thickness necessary for shielding radiation and slits each having a constant shape and opening width is obtained.