Radiation shield, radiation irradiation system and radiation shielding method

The present invention provides a structure of shielding walls for shielding radiation, which is light in weight, small in the size, and can be constructed, replaced, attached and detached conveniently and relatively easily. Namely, the radiation shield of the present invention is formed by vessels capable of charging/discharging fluid for shielding radiation. The fluid may be water and the vessel may be a water vessel. The structure may be a radiation shield comprising a plurality of water vessels and formed by stacking them like blocks. Such radiation shields can exhibit the effect at the maximum by applying them to an electron beam irradiation device and the like for temporary use. (I.S.)