Radiation shielding method and radiation shielding device

A radiation shielding device comprising:

• a hollow container installed at a predetermined portion of an object to be shielded;
• a fluid feeding unit that feeds fluid into the container via a feeding hose;
• a shielding-material supply unit that supplies a granular shielding material to the feeding hose;
• a shielding-material extracting unit that circulates the shielding material filled in the container together with fluid discharged to outside of the container via a returning hose, while feeding fluid into the container via a feeding hose;
• and
• a shielding-material recovering unit that recovers the shielding material from the fluid, wherein
• the shielding-material extracting unit includes an injection nozzle having a tubular shape and an injection port that injects the fluid fed into the container, and a fetching member having a tubular shape and an inlet for fetching the shielding material together with fluid discharged from the container, which are provided in the container, and an injection port of the injection nozzle is arranged toward the inlet of the fetching member,
• the inlet has a larger aperture than the injection port, and
• the inlet is disposed so as to face the injection port.