Patent Number: 
Section: claims

1. A radioprotective screen for protecting at least one operator from ionizing radiation, said screen comprising:a front wall structure made of radioprotective material and a lateral wall structure made of radioprotective material linked to one another at a vertical or essentially vertical corner edge,said front wall structure comprising a lower part and an upper part configured to be moved relative to one another, said upper part of said front wall structure being mounted pivotally around a vertical or essentially vertical pivoting axis at said corner edge, said lower part of the front wall structure extending in a vertical or essentially vertical plane which is offset with respect to the plane of said lateral wall structure by a fixed angle between 70° and 120°, the lower part of the front wall structure being defined bya free lateral edge,a lateral edge defining a part of said corner edge, a lower edge, andan upper edge,the lateral wall structure extending in a vertical or essentially vertical plane, the lateral wall structure comprisinga free lateral edge,a lateral edge defining a part of said corner edge,a lower edge,an upper edge,an upper part, at least a portion of the upper part being made of transparent radioprotective material, anda lower part;a base provided with ground support wheels; anda part made of flexible radioprotective material which is shaped as a panel that extends over a part of the height of said corner edge, from the lower edge of the lower part of the lateral wall structure, and from the lower edge of the lower part of the front wall structure, over a part of said lower part of the lateral wall structure and over a part of the lower part of the front wall structure at both sides of said corner edge. 2. The screen according to claim 1, wherein said panel made of flexible radioprotective material extends from the lower edge of said lower part of the lateral wall structure and from the lower edge of the lower part of the front wall structure, over more than half of the height of said lower parts of the lateral wall structure and the front wall structure, the panel extending from said corner edge, over more than half of the width of said lower parts of the front wall structure and the lateral wall structure. 3. The screen of claim 1, wherein said lower part of the front wall structure extends in the vertical or essentially vertical plane which is offset with respect to the plane of said lateral wall structure by the fixed angle on the order of 90°. 4. The screen according to claim 1, wherein the lateral wall structure further comprisesan inner face turned towards a positioning space of the operator, andan opposite outer face opposite the inner face, andwherein the upper edge of the lateral wall structure comprises an extension forming a roof made of radioprotective material, which extends on the side of said inner face. 5. The screen according to claim 1, wherein the lower part of the front wall structure comprisesan inner face turned towards a positioning space of the operator,an opposite outer face opposite the inner face, andan upper edge comprising a protective extension shaped as a tablet or a semi-rigid bib and made of a radioprotective material which extends on the side of said outer face. 6. A radioprotective screen for protecting at least one operator from ionizing radiation, said screen comprising:a front wall structure made of radioprotective material and a lateral wall structure made of radioprotective material linked to one another at a vertical or essentially vertical corner edge,said front wall structure comprising a lower part and an upper part configured to be moved relative to one another, said upper part of said front wall structure being mounted pivotally around a vertical or essentially vertical pivoting axis at said corner edge,the lower part of the front wall structure comprisingan inner face turned towards a positioning space of the operator,an opposite outer face opposite the inner face, andan upper edge including a protective extension shaped as a tablet or a semi-rigid bib and made of a radioprotective material which extends on the side of said outer face; anda base provided with ground support wheels. 7. The screen according to claim 6, wherein said tablet extends in a horizontal or essentially horizontal position from the upper edge of the lower part of the front wall structure,wherein said tablet is mounted pivotally on said upper edge of the lower part of the front wall structure, in order to allow the tablet to be raised from said horizontal position, andwherein said tablet comprises a retractable end extension configured to make the tablet telescopic. 8. A radioprotective screen for protecting at least one operator from ionizing radiation, said screen comprising:a front wall structure made of radioprotective material and a lateral wall structure made of radioprotective material linked to one another at a vertical or essentially vertical corner edge,said front wall structure comprising a lower part and an upper part configured to be moved relative to one another, said upper part of said front wall structure being mounted pivotally around a vertical or essentially vertical pivoting axis at said corner edge, the upper part of the front wall structure being formed by at least one panel made of radioprotective material, the upper part of the front wall structure comprisinga free lateral edge,a lateral edge forming a part of the corner edge,an upper edge,a lower edge,an inner face turned towards a positioning space of the operator, andan opposite outer face opposite the inner face,the lateral wall structure including a lateral edge forming a part of said corner edge, the lateral edge comprising an extension shaped as a lateral wing configured to cover the lateral edge of the front wall structure that is in front of the upper part of the front wall structure, and the associated pivoting axis, the lateral wing being formed on the side of the outer face of the upper part of the front wall structure; anda base provided with ground support wheels. 9. A radioprotective screen for protecting at least one operator from ionizing radiation, said screen comprising:a front wall structure made of radioprotective material and a lateral wall structure made of radioprotective material linked to one another at a vertical or essentially vertical corner edge,said front wall structure comprising a lower part and an upper part configured to be moved relative to one another, said upper part of said front wall structure being mounted pivotally around a vertical or essentially vertical pivoting axis at said corner edge, the upper part of the front wall structure being formed by at least one panel made of radioprotective material, the upper part of the front wall structure comprisinga free lateral edge,a lateral edge forming a part of the corner edge,an upper edge,a lower edge,an inner face turned towards a positioning space of the operator, andan opposite outer face opposite the inner face,the lateral wall structure comprisingan inner face turned towards the positioning space of the operator, andan opposite outer face opposite the inner face of the lateral wall structure, the upper edge of the lateral wall structure comprising an extension forming a roof made of radioprotective material, which extends on the side of said inner face of the lateral wall structure,the upper edge of the upper part of the front wall structure comprising a roof-forming extension made of radioprotective material which extends on the side of the inner face of said upper part of the front wall structure in a plane that is offset with respect to the plane of the roof-forming extension of the lateral wall structure; anda base provided with ground support wheels. 10. A radioprotective screen for protecting at least one operator from ionizing radiation, said screen comprising:a front wall structure made of radioprotective material and a lateral wall structure made of radioprotective material linked to one another at a vertical or essentially vertical corner edge,said front wall structure comprising a lower part and an upper part configured to be moved relative to one another, said upper part of said front wall structure being mounted pivotally around a vertical or essentially vertical pivoting axis at said corner edge, the upper part of the front wall structure being formed by at least one panel made of radioprotective material, the upper part of the front wall structure comprisinga free lateral edge,a lateral edge forming a part of the corner edge,an upper edge,a lower edge,an inner face turned towards a positioning space of the operator,an opposite outer face opposite the inner face,an upper panel at least a part of which is made of radioprotective material, anda lower panel at least part of which is made of a transparent radioprotective material, said lower panel being vertically translationally movable with respect to said upper panel, in order to form a telescopic upper part of the front wall structure, the height of which is adjustable; anda base provided with ground support wheels. 11. The screen according to claim 10, wherein the lower edge of the upper part of the front wall structure is formed by a flexible curtain composed by a juxtaposition of a plurality of flexible bands made of radioprotective material. 12. The screen according to claim 10, wherein the movable lower panel is attached to said upper panel by an equilibrium system. 13. The screen according to claim 12, wherein the equilibrium system is of a spiral-spring type with constant force. 14. A radioprotective screen for protecting at least one operator from ionizing radiation, said screen comprising:a front wall structure made of radioprotective material and a lateral wall structure made of radioprotective material linked to one another at a vertical or essentially vertical corner edge,said front wall structure comprising a lower part and an upper part configured to be moved relative to one another, said upper part of said front wall structure being mounted pivotally around a vertical or essentially vertical pivoting axis at said corner edge, the upper part of the front wall structure being formed by at least one panel made of radioprotective material, the upper part of the front wall structure comprisinga free lateral edge,a lateral edge forming a part of the corner edge,an upper edge,a lower edge,an inner face turned towards a positioning space of the operator,an opposite outer face opposite the inner face,a supporting arm pivotally mounted on said corner edge around said pivoting axis, andat least one panel is movably mounted on said supporting arm for horizontal translational movement. 15. Cover-shaped equipment configured to cover at least part of the height of the radioprotective screen according to claim 14, the cover-shaped equipment comprising:a flexible pocket provided with an opening, said flexible pocket being configured to at least one partially cover the upper part of the front wall structure by entering the lower edge of the front wall structure into the opening of said flexible pocket, said flexible pocket being provided with at least one transparent part and with a fixing system configured to fix the at least one transparent part to said upper part of the front wall structure; andat least one flexible panel configured to at least partially cover said lateral wall structure and the lower part of said front wall structure, said at least one flexible panel comprisingat least one transparent part configured to be positioned in front of the transparent part of said lateral wall structure, anda fixing system on said lateral wall structure and said front wall structure; anda flexible structure at least partially covering a tablet that extends along the upper edge of the lower part of the front wall structure, the flexible structure being either fixed to said panel to cover said lateral wall structure and the lower part of the front wall structure, or independent from said panel, said flexible structure being provided with a fixing system configured to fix the flexible structure to said tablet.