7 results about "Nuclear fission" patented technology

The invention relates to a method for separating heavy metal cations and radionuclides from aqueous solutions. The method according to the invention can be used to separate dissolved and / or suspended naturally occurring ions or radioactive ions produced by radioactive decay, nuclear transformation reactions such as nuclear fission, or, for example, by activation with neutron radiation, from aqueous solutions.

This invention provides a passive pressurized water reactor (PWR) nuclear island main building and nuclear power plant. The main building comprises a reactor building, a nuclear auxiliary building, and a nuclear island electrical building. The reactor building provides containment space for the nuclear fission reaction; the nuclear auxiliary building houses radioactive materials and non-radioactive materials preferably placed close to radioactive areas; the nuclear island electrical building houses non-radioactive materials. In a top view, the main building has a rectangular outline. The nuclear auxiliary building and the nuclear island electrical building surround the reactor building, with the reactor building located in the central region of the rectangle. The nuclear auxiliary building and the nuclear island electrical building are located on either side of the reactor building, and their outer outlines together form a rectangle. This passive PWR nuclear island main building and nuclear power plant improves the compatibility of the building layout structure.

This invention relates to a nuclear-targeted multimodal imaging diagnostic probe with BNCT therapeutic efficacy, its preparation, and its application, belonging to the fields of biomedicine and nuclear medicine technology. This boron drug contains... 10 Using acetylacetone difluoroborate as the parent nucleus, this invention endows the tumor with nuclear targeting ability by introducing N- or S-containing heterocyclic structures, while utilizing its conjugated structure to provide fluorescence / photoacoustic dual-modal imaging functionality. Based on this, the invention achieves three core functions: first, through fluorescence / photoacoustic dual-modal imaging, it enables the visual localization and real-time monitoring of tumor sites; second, by leveraging the binding of nuclear targeting groups to nuclear DNA / RNA, it... 10 B is precisely delivered into the nucleus, significantly improving the killing efficiency of BNCT; thirdly, thermal neutron irradiation is performed under imaging guidance, triggering... 10 The B(n,α)⁷Li nuclear fission reaction ultimately enables high-precision integrated diagnosis and treatment. This invention also discloses a method for preparing this probe, which has promising clinical application prospects.

A nuclear fission reactor system (10) which comprises a nuclear reactor unit (12) having a fuel block (400) with a central axis (402) extending along the length of the fuel block (400) between a first surface (412) and a second surface (422). The fuel block (400) defines a plurality of fuel assembly chambers (404) which extend from an inlet opening (410) on the first surface (412) of the fuel block (400) to an outlet opening (420) on a second surface (422) of the fuel block (400). There are also provided a plurality of fuel assemblies (100). Each fuel assembly (100) comprises a fuel compact (200) which defines a flow passage (202) running from a flow inlet (204) provided at a first end (206) of the fuel compact (200) to a flow outlet (208) provided at a second end (210) of the fuel compact (200), the passage (202) defining an internal surface (222) of the fuel compact (200). A displacer element (300) is provided in the coolant flow passage (202) and mounted such that a clearance (212) is maintained between the internal surface (222) of the fuel compact (200) and the displacer element (300) to define an annular coolant flow passage (230). Each of the plurality of fuel assemblies (100) is located in a respective one of the plurality of fuel assembly chambers (404). At least one of the fuel assemblies (100) of the plurality of fuel assemblies (100) is configured to transfer heat to the coolant in its annular coolant flow passage (230) at a first rate; and at least one other of the plurality of fuel assemblies (100) is operable / configured to transfer heat to the coolant in its annular coolant flow passage (230) at a second rate.

The present application relates to a kind of NAD (P) H response type diagnosis and treatment integrated boron medicine and its preparation method, the boron medicine with 10 B acetylacetone difluoroboric ester as mother nucleus, by introducing the cell nucleus target ability of N-containing or S-containing heterocyclic structure, simultaneously introduce the response unit that can specifically respond to high expression NAD (P) H in tumor microenvironment, activate fluorescence / photoacoustic dual-mode imaging signal, realize the visual positioning of tumor site.On this basis, the present application realizes three big core functions: one is through NAD (P) H response point light imaging, effectively reduce background signal interference;Two is by means of N or S atom and the combination of cell nucleus DNA / RNA, will 10 B be accurately delivered to nucleus, significantly improve BNCT killing efficiency;Three is under the guidance of imaging, thermal neutron irradiation is carried out, triggers 10 B (n, α) 7 Li nuclear fission reaction, finally realizes high-precision diagnosis and treatment integration.The preparation method of the boron medicine is also disclosed, can be used for preparing malignant tumor diagnosis and treatment drug, has good clinical application prospect.

This invention discloses a space nuclear reactor device and control method based on a solid hydride moderator, relating to the field of nuclear reactor technology. The device includes a hydrogen storage module, a pump module, a moderator module, a fuel module, and a control module. The moderator module uses a solid hydride as a moderator and releases hydrogen atoms. The fuel module is loaded with nuclear fuel and undergoes a fission reaction to produce fast neutrons. Hydrogen atoms collide with fast neutrons to produce thermal neutrons. The hydrogen storage module stores and provides hydrogen feedstock. The control module sends control commands according to the nuclear reaction requirements. The pump module directionally delivers hydrogen feedstock according to the control commands. The moderator module regulates the thermal neutron production efficiency by changing the density of released hydrogen atoms, obtaining the thermal neutron flux variation. The fuel module determines the nuclear fission reactivity change based on the thermal neutron flux variation. This invention uses a solid hydride as a moderator and achieves non-mechanical, continuously adjustable control of reactor reactivity by adjusting the hydrogen atom density.

A nuclear fission reactor comprising a passive thermal shut-down device, and a reactor core containing fissile fuel. The passive thermal shutdown device comprises a reservoir and a Pythagorean syphon. The reservoir is in thermal communication with the reactor core, and containing a neutron poison material which has a free surface. The Pythagorean syphon has an inlet within the reservoir, an outlet in fluid communication with the reactor core. When the neutron poison material overtops the syphon due to thermal expansion, the neutron poison material flows through the Pythagorean syphon and into the reactor core. Also provided are nuclear fission reactors having passive thermal shutdown devices using a Pythagorean syphon to control the flow of fissile fuel, neutron moderators, or neutron reflectors.