Abstract: A target used for heavy water reactor production of C-14 isotopes, which comprises: a target tube, which has a target material and/or an absorber material, the target material being a nitrogen-containing solid material; end plates, which are arranged at two ends of the target tube; a connection rod, which is provided with a connection component that is connected to a positioning mechanism used for positioning the target, wherein the connection rod passes through the target tube along the axial direction of the target tube, and the target tube is fixedly connected to the connection rod by means of the end plates. The present invention can be adapted to be placed at different locations such as at a guide tube, an inspection passage, or a fuel channel to undergo irradiation and produce C-14 isotopes.

Abstract: An alkali metal reactor power supply, including: a reactor vessel, the bottom part of which is provided with a liquid alkali metal; a reactor core, which is arranged in the reactor vessel and includes a plurality of fuel rods and a radial reflection layer arranged at the periphery of the plurality of fuel rods, wherein the surface of each fuel rod is provided with a first liquid absorption core, the bottom part of the reactor core is provided with second liquid absorption cores which are connected to the first liquid absorption cores, and the second liquid absorption cores can be in contact with the liquid alkali metal; and alkali metal thermoelectric converters, which are arranged along the circumferential direction of the radial reflection layer, and divide the inside of the reactor vessel into a high-pressure steam chamber located above the alkali metal thermoelectric converters and a low-pressure steam chamber located below the alkali metal thermoelectric converters.

Abstract: A multilayer polymeric film includes a top layer comprising poly(methyl methacrylate); a bottom layer comprising a bottom layer composition comprising poly(methyl methacrylate), polycarbonate, copolymers thereof, or a combination comprising at least one of the foregoing, wherein a glass transition temperature of the bottom layer composition is less than or equal to 140° C.; and an inner layer disposed between an inside surface of the top layer and an inside surface of the bottom layer, wherein the inner layer comprises polycarbonate.

Abstract: A multilayer polymeric film includes a top layer comprising poly(methyl methacrylate); a bottom layer comprising a bottom layer composition comprising poly(methyl methacrylate), polycarbonate, copolymers thereof, or a combination comprising at least one of the foregoing, wherein a glass transition temperature of the bottom layer composition is less than or equal to 140° C.; and an inner layer disposed between an inside surface of the top layer and an inside surface of the bottom layer, wherein the inner layer comprises polycarbonate.

Abstract: A gray control rod having a neutron absorber comprising terbium and dysprosium is provided. The neutron absorber comprises at least one first component and at least one second component, the reactivity worth of the first component increases as the service time of the neutron absorber increases, the reactivity worth of the second component decreases as the service time of the neutron absorber increases; the reactivity worth of the neutron absorber varying no more than 15% within the service time of the neutron absorber. By using the first component and the second component to form the neutron absorber, and adjusting the proportion of the respective components in the neutron absorber, the neutron absorber having a substantially planar reactivity worth loss characteristic can be obtained. The gray control rod and the assembly having required reactivity controlling ability can be obtained by increasing or decreasing the material dosage of the neutron absorber.

Abstract: A gray control rod, a neutron absorber thereof and a gray control rod assembly. The neutron absorber comprises at least one first component and at least one second component, the reactivity worth of the first component increases as the service time of the neutron absorber increases, the reactivity worth of the second component decreases as the service time of the neutron absorber increases; the reactivity worth of the neutron absorber varying no more than 15% within the service time of the neutron absorber. By using the first component and the second component to form the neutron absorber, and adjusting the proportion of the respective components in the neutron absorber, the neutron absorber having a substantially planar reactivity worth loss characteristic can be obtained. The gray control rod and the assembly having required reactivity controlling ability can be obtained by increasing or decreasing the material dosage of the neutron absorber.