| 摘要 |
PROBLEM TO BE SOLVED: To raise the efficiency in encasing radioactive substances, improve the heat-transmitting performance and attain the effective shielding againstγrays and neutrons by placing two shielding layers against them respectively outside an inner body and penetrating both layers by a good conductor. SOLUTION: Aγray shielding layer 3 and a neutron shielding layer 4 are placed between an inner body 1 and an outer body 5, and a good heat conductor 2 is provided by penetrating both layers. Therefore, the shielding layer 3 outside the inner body 1 shields againstγrays radiated from radioactive materials encased in a container. Consequently, the thickness of the inner body 1 may be reduced to the minimum which enables it to function as a pressure vessel, and the encasing efficiency is increased. Moreover, since the decay heat of the radioactive materials is efficiently transmitted from the inner body 1 to the outer body 5 by the good conductor 2, unnecessary is such a special treatment as processing the shielding layer 3 with a homogenate to improve the heat-transmitting performance. This raises the efficiency in encasing radioactive materials, improves the heat-transmitting performance and attains the effective shielding againstγrays and neutrons.
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