9 results about "Slow neutron" patented technology

The invention relates to the technical field of radiation therapy, in particular to a boron neutron capture therapy beam shaping device and a boron neutron capture therapy system. The beam shaping device for boron neutron capture therapy is used for beam shaping of a DT neutron tube generator. The interior of the beam shaping device is provided with a particle beam channel, and the particle beam channel is used for generating an initial neutron source through an incident proton beam. The beam shaping device comprises a value-added layer, a moderator, a filter layer, a reflecting layer, a collimator and a shielding layer, wherein the value-added layer, the moderator, the filter layer and the collimator are sequentially arranged from a target material to an outlet. And the axes of the particle beam channel, the value-added layer, the moderator and the collimator coincide. According to the beam shaping device, 14Mev high-energy neutrons from the DT neutron tube generator are shaped into hot / slow neutron beams meeting the BNCT treatment requirements, and impurities of fast neutrons and gamma rays are reduced to the maximum extent, so that the dosage precision and biological selectivity of treatment are effectively improved.

The invention relates to a dosimeter (A) wearable by a human subject which includes:at least a first slow neutron sensor S1; a matrix containing a certain amount of absorbent material for slow neutrons;at least a second slow neutron sensor S2; a moderator consisting of or comprising polyethylene, hydrogenated plastic, water, paraffin or other hydrogenated or deuterated compounds.

The present disclosure belongs to the technical field of neutron detection, and it relates to a structure for slow neutron detection and a method for energy spectrum measurement of slow neutrons, wherein the structure for slow neutron detection comprises: a shielding barrel, which is configured as square with an opening; and a detector unit, which is a slow neutron detector with position resolution function, wherein the detector unit is completely wrapped in the shielding barrel, and the detector unit is placed close to one of the sides of the shielding barrel that is perpendicular to the open side of the shielding barrel. When the structure for slow neutron detection moves at a set speed, the incident energy spectrum of slow neutrons can be inversely extrapolated on the basis of the number of slow neutrons at different depths.

The present invention discloses an application of an anti-neutron radiation optical fiber and a high-hydroxyl photocurable resin. The optical fiber includes: an optical waveguide structure, and a multi-layer cladding covering the optical waveguide structure; the thickness of the multi-layer cladding is 27.5 to 106.5 μm; the multi-layer cladding contains a fast neutron moderator and a thermal neutron absorber; the fast neutron moderator is covalently bonded hydrogen, and the thermal neutron absorber is a compound containing a neutron absorbing element, and the neutron absorbing element includes boron and rare earth elements; wherein: the average molar concentration of hydrogen element is 67.28 to 112.9 mol / L; the average molar concentration of the neutron absorbing element is 0.4 to 2.8 mol / L. The high-hydroxyl photocurable resin is applied to form the coating of the optical fiber. By designing a multi-layer cladding with a high hydrogen content as a neutron moderation material, the moderation effect of neutrons is significantly improved. At the same time, the boron element and rare earth elements with a large neutron absorption cross section doped in the multi-layer cladding are controlled, which can absorb thermal neutrons and do not release rays, thereby achieving the effect of anti-neutron radiation.

As a sintered body for a radiation shielding material, which can effectively shield mainly low-energy-level neutrons, that is, thermal neutrons and lower, slow neutrons, and has excellent physical properties such as bending strength and Vickers hardness, leading to high machining strength, a sintered body for a radiation shielding material comprising LiF ranging between 99 wt. % to 5 wt. %, and one or more fluorides selected from among MgF2, CaF2, AlF3, KF, NaF, and / or YF3 ranging between 1 wt. % to 95 wt. %, having physical properties of a relative density of 92% or more, a bending strength of 50 MPa or more, and a Vickers hardness of 100 or more, is provided.

The application discloses a deep space radiation neutron detector and belongs to the technical field of nuclear radiation detection. The gadolinium film captures slow neutrons to generate multi-state particles, the TPC module detects the three-dimensional tracks and energy of the inner conversion electrons and Auger electrons, the energy quantifier module detects the energy of the prompt gamma rays, and efficient and high-precision neutron detection is realized through electron-gamma coincidence measurement. The application adopts gadolinium to replace the scarce 3 He, solves the problems of low efficiency and high cost of the traditional detector, combines the track reconstruction capability of the TPC module and the high energy resolution of the energy quantifier, significantly improves the signal-to-noise ratio and detection sensitivity of the neutron signal, and is suitable for fields such as deep space exploration and nuclear radiation monitoring.

The invention discloses a neutron detection probe with a wide energy spectrum range and a neutron detector, and relates to the technical field of neutron detectors. A slow neutron sensitive scintillator is combined with a scintillation fiber, the scintillator contains a slow neutron sensitive material and a scintillation luminescent material which are uniformly mixed, incident slow neutrons can be converted into scintillation light signals, the scintillation fiber adopts a common fiber doped with an organic scintillation material, incident fast neutrons can be converted into scintillation light signals, and through coupling of the slow neutron sensitive scintillator and the scintillation fiber, the slow neutron sensitive material and the scintillation luminescent material can be obtained. And neutron detection of slow neutrons-fast neutrons in a wide energy spectrum range is realized. The detector has the advantages of being small in size, high in environmental interference resistance and easy to prepare.

The present disclosure belongs to the technical field of neutron detection, and it relates to a structure for slow neutron detection and a method for energy spectrum measurement of slow neutrons, wherein the structure for slow neutron detection comprises: a shielding barrel, which is configured as square with an opening; and a detector unit, which is a slow neutron detector with position resolution function, wherein the detector unit is completely wrapped in the shielding barrel, and the detector unit is placed close to one of the sides of the shielding barrel that is perpendicular to the open side of the shielding barrel. When the structure for slow neutron detection moves at a set speed, the incident energy spectrum of slow neutrons can be inversely extrapolated on the basis of the number of slow neutrons at different depths.

A compact and small size multichannel collimator for neutrons with energies up to 50 keV is provided. The collimator has a multichannel structure composed of collimating channels (in air, vacuum or in the non-interacting atmosphere of Helium-4) alternating with “full” channels made with absorbent materials for slow neutrons. The geometry of the individual collimating and absorbing channels can be arbitrary. The geometry with channels of square section, such as to create a perfect checkerboard, is preferred from the point of view of ease of construction.