The invention relates to a combined cold and thermal neutron moderator (10) having a longitudinal axis (t) and at least one neutron exit window (50) at a first end (11, 12), and a cold moderator (20) arranged along the longitudinal axis (t), a thermal pre-moderator (30) and a vacuum space (40), said thermal pre-moderator (30) having a pre-moderator mantle (32) surrounding the cold moderator (20) along the longitudinal axis (t) and separated from the cold moderator (20) by the vacuum space (40), characterized in that the pre-moderator (30) comprises a pre¬ moderator collar (34) extending at least at the first end (11, 12) from the pre¬ moderator jacket (32) towards the longitudinal axis (t), which substantially covers the portion of the vacuum space (40) between the cold moderator (20) and the pre¬ moderator mantle (32) from the direction of the neutron exit window (50), leaving substantially free at least one end (21, 22) of the cold moderator (20) at the end (11, 12).
C04B 20/00 - Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
E04B 1/92 - Protection against other undesired influences or dangers
E04B 2/84 - Walls made by casting, pouring, or tamping in situ
B28B 1/14 - Producing shaped articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
C04B 111/00 - Function, property or use of the mortars, concrete or artificial stone
3.
Neutron source and method of producing a neutron beam
The object of the invention relates to a neutron source, which contains a proton accelerator for producing a proton beam, and a target arranged in the trajectory of the proton beam exiting the proton accelerator for producing a neutron beam, to which the proton beam arrives in long, typically 0.5 ms-3 ms impulses, and contains a moderator-reflector system arranged in the vicinity of the target and serving for producing a moderated neutron beam, which has at least one moderator, and a reflector surrounding the moderator and the target, characterized by that at least one statistical neutron chopper is arranged to protrude into the at least one moderated neutron beam exiting channel that modulates at least one neutron beam intensity according to a random or pseudo-random sample as a function of time with its neutron transmittance ability varying according to such pattern.
G21G 1/06 - Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation, or particle bombardment, e.g. producing radioactive isotopes outside of nuclear reactors or particle accelerators by neutron irradiation
H05H 6/00 - Targets for producing nuclear reactions
4.
NEUTRON ABSORBING CONCRETE WALL AND METHOD FOR PRODUCING SUCH CONCRETE WALL
The object of the invention relates to a neutron absorbing concrete wall (10), which concrete wall (10) has an internal delimiting surface (11a), and an external delimiting surface (11b) on an opposite side to the internal delimiting surface (11a), the essence of which is that it contains a first concrete layer (13a) on the side of the internal delimiting surface (11a), and a second concrete layer (13b) on the side of the external delimiting surface (11b), which first concrete layer (13a) contains at least 0.05 mass% boron-10 isotope (10B), and the second concrete layer (13b) is formed as heavyweight concrete. The object of the invention also relates to a method for creating a neutron radiation absorbing concrete wall (10) that has an internal delimiting surface (11a), and an external delimiting surface (11b) on an opposite side to the internal delimiting surface (11a), the essence of which is a first concrete layer (13a) containing at least 0.05 mass% boron-10 isotope (10B) is formed on the side of the internal delimiting surface (11a), and a second concrete layer (13b) created as heavyweight concrete is formed on the side of the external delimiting surface (11b). The object of the invention also relates to a neutron absorbing concrete wall (10), the essence of which is that it is formed as heavyweight concrete containing at least 0.05 mass% boron-10 isotope (10B).
The invention relates to a neutron source, containing a first proton accelerator for producing a first proton beam having a first energy and a first target for producing a first neutron beam, which first target is connected to the first proton accelerator by a first beam trajectory, and at least one first neutron beam channel serving for guiding the protons exiting the first target, characterised by a second proton accelerator for producing a higher, second energy proton beam from the first proton beam, which second proton accelerator is linked to the first proton accelerator by a second proton accelerator, furthermore the first beam trajectory and the second beam trajectory contain a proton beam deflector arranged on a common section, set up to convey the proton beam along the first beam trajectory to the first target in a first operation state, and along the second beam trajectory to the second proton accelerator in a second operation state, and contain a second target for producing a second neutron beam, which second target is linked to the second proton accelerator by a third beam trajectory. In a similar way the neutron source is also conceivable with a third or even more accelerators and targets.
09 - Scientific and electric apparatus and instruments
Goods & Services
Neutron screens for neutron reactors and neutron-conducting pipes; Neutron resonators for neutron reactors and neutron-conducting pipes; Neutron shields for neutron reactors and neutron-conducting pipes; Protective radiation shields for neutron reactors and neutron-conducting pipes; Neutron screens containing boron; Neutron resonators containing boron; Neutron resonators containing boron carbide; Neutron screens containing boron carbide; Rigid or flexible neutron screens containing boron carbide; Neutron shields based on boron carbide; Rigid or flexible neutron shields based on boron carbide; Neutron resonators based on boron carbide and artificial resins; Rigid or flexible neutron shields based on boron carbide and artificial resins; Neutron screens based on boron carbide and artificial resins; Rigid or flexible neutron screens based on boron carbide and artificial resins; Protective radiation shields; Protective neutron resonators containing boron carbide; Protective radiation shields containing boron carbide; Rigid or flexible protective radiation shields containing boron carbide; Rigid or flexible protective radiation shields based on boron carbide and artificial resins.
7.
NEUTRON GUIDE SYSTEM COMPRISING NEUTRON GUIDE SECTIONS, SUPPORT FOR NEUTRON GUIDE SECTIONS AND METHOD OF ALIGNING NEUTRON GUIDE SECTIONS
The invention relates to a neutron guide system (10) having neutron guide sections (12) with two ends (27), the guide sections (27) being arranged to provide a neutron path (32), and the guide system (10) having a support structure (18) for supporting the guide sections (12). The inventive guide system (10) comprises: flexible connecting means (20) flexibly connecting the adjacent ends (27) of two adjacent guide sections (12) along the neutron path (32) for allowing tilting of the guide sections (12) relative to each other and maintaining the positions of the adjacent ends (27) of the guide sections (12) relative to each other in directions substantially perpendicular to the neutron path; and / or supports (22) provided at the adjacent ends (27) of the guide sections (12); the supports (22) comprising positioning means (40) for adjusting the position of the adjacent ends (27) along at least a substantially vertical axis. The invention further relates to such support structure (18) and a method of aligning such neutron guide system (10).
G21K 1/06 - Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction, or reflection, e.g. monochromators
8.
PROCEDURE FOR MANUFACTURING A NEUTRON-GUIDING FLAT SURFACE OF LOW WAVINESS USING A VACUUM TABLE
The subject of the invention is a procedure for manufacturing a neutron-guiding flat surface of low waviness in the course of which a thin plate coated by a material suitable for neutron reflection, advantageously of multilayered structure, is glued onto a significantly thicker carrier surface. The procedure is characterised by placing the thin neutron-reflecting plate onto a base surface of low flatness, typically of the order of magnitude of 10-5 radian, advantageously onto a vacuum table, so that the thin plate lies on the base surface with the neutron-reflecting coating facing the base surface, then the thin plate is positioned on the base surface by means of applying reclining contact points formed along the base edge determined by the size of the thin plate, the thin plate is fixed onto the base surface by means of vacuum suction, then the reclining contacts are removed and a glue is attached to the upper surface of the fixed thin plate which displays low absorption capacity to neutrons and retains its binding strength in the presence of incident neutrons, then the thick carrier plate is stuck to the upper surface of the thin plate by moving the thick plate back and forth thus providing the homogeneous dispersion of the glue, then the thick carrier plate is fixed onto the base surface by reclining points and the binding process of the glue is accelerated by a known and appropriately selected procedure of binding acceleration, then finally the glued plates are removed from the base surface by undoing the reclining points.
G21K 1/06 - Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction, or reflection, e.g. monochromators
B32B 17/06 - Layered products essentially comprising sheet glass, or fibres of glass, slag or the like comprising glass as the main or only constituent of a layer, next to another layer of a specific substance
