In a radiation detecting apparatus, an α ray and a β ray are transmitted through a light shielding film but an incident light is shielded. A first light is emitted from a first scintillator by the α ray transmitted through the light shielding film. The first scintillator has an emission center wavelength based on the α ray. A second light is emitted in a second scintillator by the β ray transmitted through the light shielding film. The second scintillator has an emission center wavelength based on the β ray. The first and second lights are detected by two photo-detectors, respectively. The first emission center wavelength and the second emission center wavelength are different from each other.

Radiation detecting apparatus

It is an object of the present invention to provide a magnetic garnet single crystal capable of reducing the optical loss of the resulting rotator even when the magnetic garnet single crystal is grown using a solvent containing Na by the liquid phase epitaxial process, as well as a Faraday rotator using the same. A magnetic garnet single crystal represented by the chemical formula Bi α Na β M1 3-α-β-γ M2 γ Fe 5-δ-e Mg δ M3 e O 12 (M1 is at least one element or more selected from Y, Eu, Gd, Tb, Dy, Ho, Yb and Lu; and M2 is at least one element or more selected from Ca and Sr; M3 is at least one element or more selected from Si, Ge, Ti, Pt, Ru, Sn, Hf and Zr, provided that 0.60<α≦1.50, 0<β≦0.05, 1.35<3−α−β−γ<2.40, 0≦γ≦0.10, 0≦δ≦0.10, 0<e≦0.10, 0<γ+δ≦0.10, 0<δ+e≦0.10).

Magnetic garnet single crystal and Faraday rotator using the same

PROBLEM TO BE SOLVED: To provide a lithium tantalate (LT) substrate which has sufficient characteristics as a piezoelectric material and with which the problem of lowering of yield or the like caused by pyroelectricity of the substrate in an element production process can be solved; and to provide a method for producing the same. SOLUTION: The lithium tantalate substrate in which the volume resistivity is controlled within the range of 10 6 -10 8 Ω cm can be produced by processing a lithium tantalate crystal grown by the Czochralski method into a substrate form to obtain an LT substrate, then burying the LT substrate in a mixed powder of Al and Al 2 O 3 , and heat treating the substrate at a holding temperature of 350-600°C. It is preferable that the heat treatment is performed in a reduced-pressure atmosphere of an inert gas. COPYRIGHT: (C)2005,JPO&NCIPI

Lithium tantalate substrate and its producing method

When employing specular reflective material in a scintillator crystal array, light trapping in the crystal due to repetitive internal reflection is mitigated by roughening at least one side ( 16 ) of each of a plurality of pre-formed polished scintillator crystals. A specular reflector material ( 30 ) is applied (deposited, wrapped around, etc.) to the roughened crystals, which are arranged in an array. Each crystal array is coupled to a silicon photodetector ( 32 ) to form a detector array, which can be mounted in a detector for a functional scanner or the like.

Optimized scintilator crystals for pet

A shift lever device for an automotive automatic transmission comprising a base bracket (11) fixed on a vehicle floor, said base bracket having an automatic mode shift slot, a manual mode shift slot parallel to the automatic mode shift slot and a switching slot (23c) connecting the automatic mode shift slot and the manual mode shift slot, a shift lever (15,18) supported to said base bracket so as to be swingable in the fore-and-aft direction of an automotive vehicle, said shift lever being extended over said base bracket so as to be moved through the automatic mode shift slot, the manual mode shift slot and the switching slot, and a selector lever (16) interconnected with an automatic transmission through a linkage so as to change a shift position in an automatic shift mode. Said selector lever being integrally swung with said shift lever when said shift lever is put in the automatic mode shift slot, said selector lever being released from said shift lever when said shift lever is put in the manual mode shift slot to electrically execute an up-shift and down-shift through a fore-and-aft direction swing of said shift lever. A lower end portion of the shift lever and a lower end portion of the selector lever are supported to a shaft portion (13) so that the shift lever and said selector lever are swingable in the fore-and-aft direction of the automotive vehicle.

Shift lever device for automatic transmission

PROBLEM TO BE SOLVED: To provide a method for producing an oxide single crystal by raising the oxide single crystal by Czochralski method and subsequently cooling the raised single crystal from the raising temperature to room temperature, enabling to prevent the generation of cracks by cooling the single crystal so that a temperature difference between both the upper and lower ends of the single crystal is a specific value or smaller. SOLUTION: This method for producing an oxide crystal comprises setting heat- insulating alumina 5 on a heat-insulating material 4 surrounding a crucible 3, attaching a doughnut-like reflector 6 to the upper surface of the crucible 3 or the heat-insulating alumina 5, attaching a cylindrical afterheater 7 to the upper surface of the reflector 6, heating a raw material in the crucible 3 with a heating coil 8 to produce a molten liquid 9, bringing a seed crystal 11 into contact with the molten liquid 9, raising the oxide single crystal 12 by Czochralski method, cutting off the raised crystal 12 from the molten liquid 9, moving the whole body of the raised crystal 12 to a place above the reflector 6, starting to cool the crystal, and cooling the crystal to room temperature. Thereby, a difference between temperatures at both the upper and lower ends of the raised crystal 12 on the cooling treatment can be reduced to 50 deg.C or lower to produce the good crystal slight in defects.

Production of oxide single crystal

PURPOSE:To obtain a single crystal without any crack and bubbly inclusions with good productivity by installing a substance transparent in the visible and infrared regions in the presence of a seed crystal and growing the single crystal according to the Bridgman method CONSTITUTION:A platinum crucible 2 is installed in an electric furnace 1 and a melt 3 of a polycrystal melted by heating with a heater part is held in the crucible 2 A platy seed crystal 4 is placed under the platinum crucible 2 and a substance 5 transparent in the visible and infrared regions is installed under the seed crystal 4 Thereby, the melt 3 is brought into contact with the seed crystal 4 according to the Bridgman method As a result, the melt is lowered under a furnace 1 kept at a lower temperature at a lowering speed according to the crystal growth to grow a single crystal in the crucible 2 Since the substance 5 transparent in the visible and infrared regions is installed under the seed crystal, cracks are not caused in the single crystal in this case without producing bubbly inclusions

Production of single crystal

A radiant ray-detector having a high resolving ability and capable of being easily produced as well as a method for producing the same are herein disclosed. The radiant ray-detector comprises a plurality of photomultiplier tubes 11 combined together and scintillator chips 1, wherein the scintillator chips 1 each is in the form of a hexahedron, more than one face thereof is mirror finished, the other faces are surface-toughened and a number of these scintillator chips 1 greater than the number of the photomultiplier tubes 11 are joined together so that the overall area of the resulting mirror surface of a group of scintillator chips 1 is approximately identical to the area of an entrance window 12 of each corresponding photomultiplier tube 11 and wherein different transmittances are imparted to individual coarse faces 4 of the scintillator chip 1 joined to those of other scintillator chips. In particular, the transmittances of these scintillator chip 1 are preferably designed such that they increase as the distance between the chips and the center of the group of chips increases. The method for producing the radiant ray-detector is characterized in that the transmittance of each joined face 4 of the scintillator chip 1 is controlled by properly selecting the particle size of abrasive grains used for finishing each coarse face.

Radiant ray-detector and method for producing same

PURPOSE: To improve a yield in initial pulling up of a single crystal by forming the prescribed quality of the total charge quantity or above to a single crystal lump of lithium tantalate in initial raw material charge. CONSTITUTION: More than 40% of the total charge quantity is formed as the single crystal lump of lithium tantalate and is charged particularly to periphery of the wall surfaces of a crucible. The remaining materials are charged so as not to come into direct contact with the wall surfaces of the crucible. The improvement in the yield is made possible by using the single crystal lump regarded to be free from impurities in the initial raw material charge liable to be affected by the impurities. The signal crystal lump which is cracked in the production process in addition to the parts not appropriate for water processing is used. A reflector 6 and an after heater 7 are disposed in the crucible 3 of Fig. and a disk-shaped cap 13 having apertures 13a, 13b, is placed thereon. Further, the crucible is projectingly provided with baffle parts 14a, 14b and projections 15a, 15b. Raw materials for calcination and the signal crystal lump are put into the crucible and a seed crystal 11 is put into a melt 9 after melting. The single crystal 12 is then pulled up.

Production of lithium tantalate single crystal

PURPOSE:To shorten the machining time, securing the energy dissolving power and output wave height value, and reduce the machining cost by mirror-surface- machining at least an emission surface of the scintillation light, among the surface of a Bi4Ge3O12 crystal by a cutting machine using fixed abrasive grains. CONSTITUTION:A radiation ray detector is formed by optically joining a Bi4Ge3 O12 crystal 2 having a square shape as scintillator with an photomultiplier tube 1. The crystal 2 is cut out by using an inner periphery cutting machine, and all the surfaces are rough-surface-finishing-worked by abrasive grains. Then, one surface 2a is mirror-surface-worked to form an emission surface. In the mirror surface machining, a fine flat surface grinder which is constituted of a disc shaped rotating grindstone installed on a horizontal rotating drive shaft and a stage which is installed under the rotating grindstone and can be moved in reciprocation in the horizontal direction is used. After the mirror surface machining, the crystal block is heat-treated under the oxygen environment in a prescribed concentration. A Teflon tape is wound on the surface other than the emission surface 2a of the crystal 2, and a reflecting layer 3 having a prescribed thickness is formed, and a scintillator is completed.

Machining for scintillator

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