Abstract:
A photomultiplier of the present invention includes a photoelectric surface for photoelectrically converting incident light and emitting electrons, and a plurality of stages of dynodes for multiplying the electrons. The photomultiplier includes the box dynodes (1,2,3) for receiving the electrons emitted from the photoelectric surface and the in-line dynodes (5,6,7) for receiving the electrons emitted from the connecting dynode (4).
Abstract:
A photomultiplier of the present invention includes a photoelectric surface for photoelectrically converting incident light and emitting electrons, and a plurality of stages of dynodes for multiplying the electrons. The photomultiplier includes the box dynodes (1,2,3) for receiving the electrons emitted from the photoelectric surface and the in-line dynodes (5,6,7) for receiving the electrons emitted from the connecting dynode (4).
Abstract:
PROBLEM TO BE SOLVED: To provide a microchannel plate having excellent characteristics capable of attaining both high luminance and high resolution at the same time, a gas proportional counter tube and an imaging device. SOLUTION: An inspection device of imaging type is such as an electric source system and a control system are connected to an imaging system. The imaging system comprises a chamber stored with a light detector through an FOP at a rear step of the chamber provided with an MCP1 with a plurality of channels 13 having beryllium windows. And also, an electrode 1a is set on a periphery of an opening end of each channel 13 and on its inner wall. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PURPOSE:To provide high sensitivity and improve yielding by making the deposi tion weight of thin layer of CsI, KBr or CuI formed on a base 100mug/cm or less. CONSTITUTION:A fully thin layer of CsI, KBr or CuI is deposited on a base and the deposition weight of the layer is made 100mug/cm or less. In this case as the base material Ni, Al or stainless is used. In the case where the deposition weight of CsI or the like is 100mug/cm or more quantam efficiency becomes 30% or less while it is 300 to 100mug/cm , the efficiency is 30% or more. By making deposition weight of the layer 50-75mug/cm or so, sensitivity is improved widely. And also yielding is improved.
Abstract:
PROBLEM TO BE SOLVED: To provide an electron tube for detecting radiation. SOLUTION: The electron tube comprises a light reception surface plate 2 made of a scintillator crystal where a photoelectric surface 1 is formed on the inner surface, a cylinder 3 made of Kovar that forms the side tube of a vacuum container, and a seal ring 4 made of aluminum being included between the light reception surface plate 2 and the cylinder 3. The scintillator crystal for composing the light reception surface plate 2 is a YAP crystal. When a scintillator material made of BGO or the like that is not illustrated is to be arranged on this crystal, fluorescence being generated by incidence of radiation to the BGO enters the photoelectric surface 1 through the light reception surface plate 2 with reflection in the interface surface between BGO and YAP inhibited since a reflection factor in the TAP is larger than that in crystal. COPYRIGHT: (C)2003,JPO
Abstract:
PURPOSE:To shorten a tube length, and improve high-gain and high-speed responsiveness by providing a front stage part comprising box-type dynodes, a connection stage dynode, and a back stage part comprising inline-type dynodes. CONSTITUTION:In a vacuum container 100, a front stage part comprising box- type dynodes 4a-4c, a connection dynode 4d, and a back stage part comprising inline-type dynodes 4e-4g are disposed to compose electron multiplier parts 4a-4h. Between the last dynode 4h and the dynode 4g, an anode electrode 5 is disposed. Aluminum coating is applied to side walls of inner surfaces of the container 100, and by giving a specified voltage to this coating, light incidental from an upper end surface 100a is photo-converted at a photoelectric surface 120, thereby generated electrons can be collected through a joint grid 40a of the dynode 4a effectively.
Abstract:
PROBLEM TO BE SOLVED: To provide a compact and sensitive radiation detector. SOLUTION: The radiation detector 10 is provided with a scintillator 12 for emitting light according to the incidence of radiation, and a photomultiplier 14 for detecting light being emitted from the scintillator 12. The photomultiplier 14 is provided with a main photoelectric surface 18, a side photoelectric surface 20, a focusing electrode 22, and an electron multiplication part 24 in a glass tube 16. The main photoelectric surface 18 is formed on the entire surface of the inner wall of a light incidence surface 16a out of two end faces for constituting the glass tube 16. Also, the side photoelectric surface 20 is formed on the inner wall of a part being adjacent to the peripheral part of the light incidence surface 16a out of the side surface 16b of the glass tube 16. Also, a part that is outside the glass tube 16 and corresponds to the main photoelectric surface 18 and the side photoelectric surface 20 is covered with the scintillator 12.
Abstract:
PURPOSE: To provide a photomultiplier capable of suppressing the noises by the light generated in a glass bulb by cosmic ray or environmental γ-ray. CONSTITUTION: This photomultiplier is provided with a vacuum sealed container 11 storing a photoelectric surface 4, a focusing electrode 5, an electron multiplying section 6, and an anode 10 in it. The vacuum sealed container 11 is constituted of a transparent portion 2 passing and guiding the light to the photoelectric surface 4 and a glass bulb 1 provided with colored portions 3, 11 colored in black. Even if cosmic ray, environmental γ-ray, or leakage electrons from the inner electron multiplying section 6 are applied to the colored portions 3, 11 of the glass bulb 1 to cause luminescence, the light is absorbed in the colored portions 3, 11, and the light causing noises does not reach the photoelectric surface 4.