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Radiation detector with flash optical fiber

A radiation detector and scintillation fiber technology, applied in the field of radiation detectors, can solve the problems of low interaction probability, poor sensitivity and energy characteristics, large transmission loss of scintillation fiber, etc.

Inactive Publication Date: 2002-08-07
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Furthermore, the conventional scintillation optical fiber 3 is only covered with a light-shielding tube, and is formed of a single part.
[0007] In the radiation detector using the above-mentioned traditional scintillation fiber, since the scintillation fiber 3 is composed of a single component, when the radiation with strong penetrating power passes through this scintillation fiber, the probability of interaction is low, Problems such as low detection sensitivity
At the same time, due to the large transmission loss of scintillation fiber itself, poor sensitivity and energy characteristics, the measurement range of radiation dose rate and long-distance transmission are limited.

Method used

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Embodiment 1

[0042] Embodiment 1 of the present invention will be described below with reference to the drawings. figure 1 The structure of the main part of the radiation detector according to Embodiment 1 of the present invention is schematically shown, wherein (a) is a cross-sectional structure diagram of a scintillation optical fiber, and (b) is a side structure diagram thereof. 101 in the figure is the measurement target radiation; 102 is the scintillation optical fiber, 103 is the scattering material that interacts with the radiation 101 to release electrons, 104 is the interaction point between the radiation 101 and the scattering material 103, and 105 is the interaction point The electrons or electrons and radiation rays released by 4, 106 are fluorescent spots generated due to the incident electrons or electrons and radiation rays.

[0043] The related work is explained below.

[0044] When the radiation 1 is incident into the radiation detector 101 with the above structure, it d...

Embodiment 2

[0049] figure 2 The structure of the main part of the radiation detector of the second embodiment of the present invention is outlined. In Embodiment 1, there is no through hole in the scattering material 103 arranged around the scintillation optical fiber 102, but in Embodiment 2 as figure 2 Through-holes 201 are shown provided in the scattering material 103 . At this time, a light-shielding tape 202 is provided so that light does not directly enter the scintillation fiber 102 . Under such a structure, there is radiation 101 directly incident on the scintillation fiber. In addition to having the same effect as that of Embodiment 1, the range of sensitivity, energy characteristics and radiation dose rate can also be adjusted through the position of the fiber. According to this structure, high sensitivity and stable energy characteristics can be realized at the same time by combining a scattering material with a large atomic number.

Embodiment 3

[0051] image 3 The main part of the radiation detector according to Embodiment 3 of the present invention is schematically shown in sectional view. Arranging multiple scintillation fibers 102 in the scattering material 103 can achieve the same effect as the above-mentioned embodiment 1, but the probability of radiation interacting with the scintillation fibers 102 can be further increased due to the arrangement of multiple scintillation fibers 102 . In addition, when a bundle of radiation interacts with the scintillation optical fiber 102 to generate fluorescence in multiple scintillation optical fibers, when the multiple scintillation optical fibers 102 are bundled and connected to a photodetector at one end or both ends respectively, it is possible to obtain The amount of light received is equivalent to one pulse, and the same effect of increasing the amount of fluorescence can be achieved.

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Abstract

A radiation detector obtains radiation information by detecting a light pulse occurred in response to a radiation in a scintillation fiber at one end or opposite ends of the scintillation fiber. The scintillation fiber is surrounded by a scattering member which emits an electron by interaction with the radiation.

Description

technical field [0001] The invention relates to a radiation detector which uses a scintillating optical fiber to detect the radiation incident position, radiation dose or radiation dose rate in the environment requiring monitoring such as radiation control areas. Background technique [0002] Figure 16 It is, for example, a block diagram of a conventional radiation detector using a scintillation fiber as shown in the Abstracts of "Radiation Detectors and Their Applications" (January 26-27, 2016, Institute of High Energy Physics). In the figure, number 1 is collimated radiation, 2a and 2b are light pulses generated by fluorescence, 3 is scintillation fiber, 4a and 4b are two light-receiving elements connected to scintillation fiber 3, and 5a-5b are two A preamplifier, 6a, 6b are constant segment discriminators, 7 is a signal delay circuit, 8 is a time peak converter, 9 is an analog-to-digital converter, and 10 is a multi-channel peak analyzer used as a radiation analyzer. ...

Claims

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Application Information

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IPC IPC(8): G01T1/00G01T1/20G01T5/08G02B6/00
CPCG01T1/201
Inventor 冈彻津高良和
Owner MITSUBISHI ELECTRIC CORP
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