Transport/storage cask for radioactive material

摘要

A transport/storage cask for a radioactive material has an inner shell (8), an outer shell (9) and a circular gamma ray shielding layer (10) and a circular neutron shielding layer (11) both of which are placed between the inner shell (8) and the outer shell (9). The gamma ray shielding layer (10) is formed by aligning a plurality of gamma ray shielding blocks (12) composed of lead in a block shape in the circumferential direction. The entire gamma ray shielding block (12) in the axial direction is covered with a copper tube (16) having a higher elasticity limit than the gamma ray shielding block (12). In the above transport/storage cask, the gamma ray shielding layer (10) composed of lead or a lead alloy is not easily deformed.