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Fluorescent material, scintillator using same, and radiation detector using same

A radiation detector and fluorescent material technology, which is applied in the field of fluorescent materials to achieve the effects of stabilizing detection performance, improving resolution and shortening scanning time

Active Publication Date: 2010-02-03
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in fact the attenuation of the afterglow is not an exponential function

Method used

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  • Fluorescent material, scintillator using same, and radiation detector using same
  • Fluorescent material, scintillator using same, and radiation detector using same
  • Fluorescent material, scintillator using same, and radiation detector using same

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no. 1 approach

[0100] The fluorescent material of the first embodiment of the present invention is characterized in that Ce is used as a luminescent element, at least Gd, Al, Ga, O and Si are contained, M is at least one of Mg, Ti, and Ni, and is represented by the following general formula :

[0101] (Gd 1-x-z Lu x Ce z ) 3+a (Al 1-u-s Ga u sc s ) 5-a o 12

[0102] in:

[0103] 0≤a≤0.15,

[0104] 0≤x≤0.5,

[0105] 0.0003≤z≤0.0167,

[0106] 0.2≤u≤0.6,

[0107] 0≤s≤0.1,

[0108] The concentrations of Si and M are:

[0109] 0.5≤Si concentration mass ppm≤10,

[0110] 0≤M concentration mass ppm≤50.

[0111] In the present invention, the material must contain Si. The Si content is 0.5 to 10 mass ppm. according to Figure 4 As a result, when the Si content exceeds 10 mass ppm, the 3ms afterglow exceeds 800 ppm, which is larger than the allowable value, so the upper limit of the Si content is 10 mass ppm (preferably, the upper limit is 5 mass ppm). However, in the raw materials f...

no. 2 approach

[0145] In a second embodiment, the above-mentioned fluorescent material is used as a scintillator, and a radiation detector is provided with the scintillator and a light receiving element for detecting light emitted by the scintillator. The radiation detector is suitable for medical observation devices or inspection devices such as X-ray CT, PET (Positron Emission Tomography) or PET / CT.

[0146] In other words, when the above-mentioned fluorescent material is used as a scintillator, a high-performance radiation detector with high time resolution can be obtained because the luminous intensity is high, the decay time constant is small, and afterglow is small.

[0147] The radiation detector such as Figure 15 , 16 As shown, a structure including a scintillator and a photodetector for detecting the light emission of the fluorescent material can be obtained. Figure 15 It is a perspective view showing a general structure of a radiation detector, Figure 16 yes Figure 15 A-A i...

Embodiment 1

[0152] 200 g of raw materials, 1300 g of high-purity alumina balls with a diameter of 5 mm, and 200 cc of ethanol were placed together in a resin crucible with a capacity of 1 liter. After mixing for 12 hours, the mass of the alumina balls became 0.06 g. Consider Al from the ball 2 o 3 In order to obtain the composition of Example 1 in Table 2, weigh Gd respectively 2 o 3 (Si: 3 mass ppm) 126.91g, CeO 2 0.363g, Al 2 o 3 (Si: 10 mass ppm) 40.62g, Ga 2 o 3 (Si: 10.0 mass ppm) 32.05 g. Gd 2 o 3 A raw material powder having an average particle diameter of 2 μm (here, the average particle diameter is the median particle diameter) was used. al 2 o 3 and Ga 2 o 3 Raw material powders of 0.6 μm and 3 μm were used respectively. al 2 o 3 As the powder, the powder that was subjected to heat treatment at 1400° C. for 1 hour in vacuum (~10 Pa) and then pulverized by a ball mill for 12 hours was used. Through such treatment, Si was reduced from 10 mass ppm to 3 mass ppm. ...

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Abstract

The present invention relates to a fluorescent material and a scintillator and radioactive ray detector using the same. The fluorescent material is characterized in that: Ce is used as lighting element, at least comprising Gd, Al, Ga, O, Si, and the component M is at least one of Mg, Ti, and Ni. In addition, the composition of the material must be expressed by the general formula: (Gd 1-x-z Lu x Ce z ) 3+a (Al 1-u-s Ga u Sc s ) 5-a O 12 wherein 0<=a<=0.15, 0<=x<=0.5, 0.0003<=z<=0.0167, 0.2<=u<=0.6, and 0<=s<=0.1, and wherein, regarding the concentrations of Si and M is 0.5<=Si concentration (mass ppm)<=10, and 0<=M concentration (mass ppm)<=50. The fluorescent material has the characteristics of low with high lighting strength and when in stopping x-ray radiation 1 to 300ms, to the low afterglows.

Description

technical field [0001] The present invention relates to a fluorescent material that absorbs radiation such as X-rays and emits light, and a scintillator and a radiation detector using the fluorescent material. Background technique [0002] X-ray CT (Computed Tomography) is one of X-ray diagnostic devices. This CT is composed of an X-ray tube that emits fan beam X-rays and an X-ray detector that includes a plurality of X-ray detection elements in parallel. This device irradiates fan-shaped beam X-rays from the X-ray tube to the X-ray detector, changes the angle of the fault plane by, for example, 1 degree each time it is irradiated, collects X-ray absorption data, and then analyzes these data with a computer to calculate The X-ray absorption rate at each position of the fault plane is used to form an image corresponding to the absorption rate. [0003] Conventionally, for such X-ray detectors, xenon (Xe) gas detectors have been used. This xenon gas detector seals xenon gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80G01T1/202
CPCG21K4/00C09K11/7774C04B35/44C04B35/6455C04B2235/3217C04B2235/3224C04B2235/3229C04B2235/3286C04B2235/5409C04B2235/5436C04B2235/5445C04B2235/604C04B2235/6585C04B2235/661C04B2235/728C04B2235/764C04B2235/77C01G15/006C01P2002/50C01P2002/54C01P2002/84C01P2006/12C01F17/34
Inventor 中村良平上田俊介
Owner PROTERIAL LTD
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