An apparatus for a nuclear detector of a downhole tool and method of manufacturing the apparatus is disclosed. The apparatus includes a single multi-metallic component manufactured using additive manufacturing, wherein the component includes at least a first material having a first density and a second material having a second density. The method includes using additive manufacturing to form the component so that the component includes at least a first material having a first density and a second material having a second density and the first material and the second material form the single multi-metallic component.

Examples of an electronic component device includes a housing formed of a member that causes radiation to lose its energy by generating an electric charge when the housing is subjected to the radiation and an electronic component housed in the housing. The member is a semiconductor device member having a PN junction.

A neutron beam shielding gypsum-based building board includes gypsum, a boron-containing material containing boron an amount of which is in a range from 1.0 parts by mass to 120 parts by mass with respect to 100 parts by mass of the gypsum, and a water reducing agent in a range from 0.05 parts by mass to 2.0 parts by mass with respect to 100 parts by mass of the gypsum. The boron-containing material includes one or more kinds selected from calcium borate, boron carbide, boric acid, boron oxide, sodium borate, and calcium boride, and a specific gravity in a dry condition is in a range from 0.65 to 1.6.

A neutron beam shielding gypsum-based building board includes gypsum, a boron-containing material containing boron an amount of which is in a range from 1.0 parts by mass to 120 parts by mass with respect to 100 parts by mass of the gypsum, and a water reducing agent in a range from 0.05 parts by mass to 2.0 parts by mass with respect to 100 parts by mass of the gypsum. The boron-containing material includes one or more kinds selected from calcium borate, boron carbide, boric acid, boron oxide, sodium borate, and calcium boride, and a specific gravity in a dry condition is in a range from 0.65 to 1.6.

The present invention aims to provide cellulose fibers covered by inorganic particles on the fiber surface. According to the present invention, complexes of a cellulose fiber and inorganic particles wherein 15% or more of the surface of the cellulose fiber is covered by the inorganic particles can be obtained.

The present invention aims to provide cellulose fibers covered by inorganic particles on the fiber surface. According to the present invention, complexes of a cellulose fiber and inorganic particles wherein 15% or more of the surface of the cellulose fiber is covered by the inorganic particles can be obtained.

A drillhole plug includes a frame or housing of a corrosion-resistant material and sized to fit within a milled portion of a directional drillhole that includes a hazardous waste repository; and a material that fills at least a portion of the frame or housing. The material exhibits creep such that the material fills one or more voids between the frame or housing and a subterranean formation adjacent the milled portion of the directional drillhole.

The present invention provides a radiation shielding material, particularly for shielding of particle radiation, comprising a fibre material and a radiation damping filler, wherein the amount of the radiation damping filler is 40 to 95 wt. % based on the dry weight of the radiation shielding material. The present invention further provides a radiation shielding structure, particularly for shielding of particle radiation, comprising a bottom layer and a top layer, wherein a hollow structure is sandwiched between the bottom layer and the top layer, wherein the hollow structure is filled with a radiation damping filler.

A power generator system includes one or more heat transfer members configured to contact: a heat source in a hazardous waste repository of a directional drillhole that stores nuclear waste in one or more nuclear waste canisters, and a heat sink in the hazardous waste repository; and one or more thermoelectric generators thermally coupled to the one or more heat transfer members and configured to generate electric power based on a temperature difference between the heat source and the heat sink.

An enclosure for non-organic electronic components is provided which includes an inner cavity for housing non-organic electronic components and a neutron shielding barrier surrounding the inner cavity and the electronic components housed within the cavity. The barrier is formed from a neutron reflecting material in solid or powdered form and a neutron absorbing material in solid or powdered form. An optional structural support is provided in certain aspects of the enclosure design.