A method for making a radiation shield includes generating a three-dimensional (3D) model for a metal body to serve as a radiation shield based upon a predetermined radiation stopping thickness for the metal and a predetermined strength based upon the metal and a pattern of voids therein. The method includes performing fused filament deposition to create the metal body having the pattern of voids therein.

A packaging for transporting and/or storing radioactive materials, the lateral body of which has a thickness change zone defining a transition surface, and including a portion of reduced thickness extending from the transition surface towards a first axial end of the lateral body, this portion of reduced thickness including an inner surface laterally delimiting a recessed zone of the lateral body, also delimited axially by the transition surface. Moreover, the packaging includes a portion reconstituting the lateral body extending around the longitudinal axis, arranged removably in the recessed zone, and having an inner surface that laterally delimits a portion of the housing cavity intended to receive the mass of radioactive materials.

Disclosed is a composite material, comprising a polymer, a plurality of metal nanoparticles, and a surface-modifying agent (e.g., nanocellulose). Also disclosed is a method for shielding a subject from electromagnetic radiation, comprising placing one or more composite materials between the subject and a source of electromagnetic radiation, thereby reducing a dose of electromagnetic radiation received by the subject.

In general, radiation shielding systems that shield radiation from multiple directions are described. In one embodiment, method of shielding radiation is provided, including orienting the rigid radiation shield in a selected position relative to a patient, and attaching a flexible radiation shield to the rigid radiation shield such that the flexible rigid radiation shield includes a first generally vertical portion that covers a gap between the rigid radiation shield and the patient.

Provided is a body, a method for manufacturing the body and a method of using of the body for nuclear shielding in a nuclear reactor. The body may include boron, iron, chromium, carbon and tungsten.

A radiation protection device for an opening for inspection objects on a radiation tunnel is provided. The radiation protection device is formed from a plurality of radiation protection curtains arranged one behind the other at a distance in a transport direction, wherein a first radiation protection curtain includes a first shielding radiation protection curtain section covering only a first area of the opening and second shielding radiation protection curtain sections of at least one second radiation protection curtain arranged behind the first radiation protection curtain in the transport direction cover the area of the opening not covered by the first radiation protection curtain.

The present invention provides a radiation resistant high-entropy alloy and a preparation method thereof. A general formula of the radiation resistant high-entropy alloy is TiZrHfVMoTa.sub.xNb.sub.y, where 0.05≤x≤0.25, 0.05≤y≤0.5, and x and y are molar ratios. The preparation method of the radiation resistant high-entropy alloy comprises the following steps: mixing Ti, Zr, Hf, V, Mo, Ta, and Nb in order, and conducting vacuum levitation induction melting or vacuum arc melting, to obtain the radiation resistant high-entropy alloy. The high-entropy alloy in the present invention has an excellent irradiation resistance, and does not suffer radiation hardening damage under simulated helium ion irradiation. When helium bubbles are of same sizes as those of conventional alloy, the bubble density of the high-entropy alloy is far lower than that of the conventional alloy, and the lattice constant thereof decreases abnormally after irradiation.

Methods and systems for stabilizing spent fuel assemblies from sodium-cooled nuclear reactors using Zamak are described herein. It has been determined that there is a synergism between Zamak and sodium that allows Zamak to form thermally-conductive interface with the sodium-wetted surfaces of the fuel assemblies. In the method, one or more spent fuel assemblies are removed from the sodium coolant pool and placed in a protective sheath. The remaining volume of the sheath is then filled with liquid Zamak. To a certain extent Zamak will dissolve and alloy with sodium remaining on the fuel assemblies. Excess sodium that remains undissolved is displaced from the sheath by the Zamak fill. The Zamak is then cooled until solid and the sheath sealed. The resulting Zamak-stabilized spent fuel assembly is calculated to have sufficient internal thermal conductivity to allow it to be stored and transported without the need for liquid cooling.

A radiation shielded vault structure includes a rigid outer structure comprising a plurality of rigid structural components that are interconnected at elongated joints to define an interior space. The structural components include a layer of lower atomic number (Z) material such as aluminum alloy and one or more layers of higher atomic number (Z) material titanium and/or tantalum. The vault structure may include radiation shield members extending along the elongated joints to provide radiation shielding at the elongated joints. The shield members comprise a higher atomic number (Z) material such as titanium or tantalum. The rigid structural components may comprise plate members that are interconnected along side edges thereof. End plates may be attached to the plate members to close off the interior space.

Certain embodiments are described that are directed to lead free compositions including radiation absorption metals in combination with a polymeric material. In some aspects, a composition includes at least one heavy metal, other than lead, known to have shielding capability against ionizing radiation and at least one polymer, polymer blend or co-polymer. Sheets and articles including the compositions are also described.