A screen made of radiation shielding material for protecting an operator from ionizing radiation, includes: (i) a lower part equipped with a front wall made of radiation shielding material, having an upper border; (ii) an upper part equipped with a front wall made of a radiation shielding material, at least one part of which is transparent, which front wall includes a lower border; and (iii) at least one passage for the arms of the operator. The front walls of the upper part and of the lower part are separable from each other, the upper part being borne by supporting elements allowing the screen to be reversibly maneuvered either into an active radiation shielding position in which the upper and lower borders are juxtaposed, or into a retracted position in which the upper and lower borders are separated from each other, in order to free a space above the lower part.