Fluorescent screen, x-ray detector, and x-ray inspection apparatus

A technology of X-ray and fluorescent plate, which can be used in measurement devices, X-ray/infrared technology, X/γ/cosmic radiation measurement, etc.

Pending Publication Date: 2021-08-20
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to increase the intensity of visible light, for example, it is possible to increase the intensity of X-rays irradiated to luggage, but in X-ray inspection devices installed in public places li...

Method used

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  • Fluorescent screen, x-ray detector, and x-ray inspection apparatus
  • Fluorescent screen, x-ray detector, and x-ray inspection apparatus
  • Fluorescent screen, x-ray detector, and x-ray inspection apparatus

Examples

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Embodiment 1

[0074] The fluorescent plate in embodiment 1 is to use Gd 2 o 2 S: Phosphor plate made of Pr, Ce phosphor. Gd 2 o 2 S: Pr, Ce phosphor was produced through the following steps. First, praseodymium oxide and cerium oxide were dissolved in nitric acid at a target ratio (99.3:0.7) of Pr and Ce in parts by weight to prepare a mixed solution of both. Next, this solution is reacted with, for example, a predetermined amount of dimethyl oxalate solution to obtain a coprecipitated oxalate of Pr and Ce. This co-precipitated oxalate was calcined in the air at a temperature of 1000° C. or lower for several hours to obtain a mixed oxide of Pr and Ce. In this way, a mixed powder in which Pr and Ce are uniformly dispersed in minute units is obtained.

[0075] Next, as a step of synthesizing the phosphor, with respect to Gd 2 o 2 The amount of Pr added to the S matrix is ​​0.07% by mass (at the same time, the amount of Ce added is 0.0005% by mass (5ppm)). Salt, alkali metal phosphate...

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Abstract

A fluorescent screen is configured to convert an X-ray into visible light to one embodiment. The screen includes a gadolinium oxysulfide phosphor activated with praseodymium and cerium. The phosphor contains praseodymium having a concentration of 0.01 mass % or more and 0.3 mass % or less and cerium having a concentration of 5 ppm or more and 30 ppm or less. An average particle diameter of the phosphor is 10 [mu]m or more and 20 [mu]m or less. A weight per unit area of the phosphor is 270 mg/cm2 or more and 380 mg/cm2 or less.

Description

technical field [0001] Embodiments of the present invention relate to a fluorescent panel, an X-ray detector, and an X-ray inspection device. Background technique [0002] For countermeasures against terrorism and safe operation of aircraft, baggage is pre-checked at the airport when it is brought into the aircraft. As such a baggage inspection device for inspecting baggage, for example, a transmission X-ray inspection device utilizing the transmission of X-rays, a Compton scattering X-ray inspection device utilizing Compton scattering of X-rays, X-ray inspection apparatuses of a dual-energy system in which the X-ray energy obtained by image processing of high-energy X-ray images and low-energy X-ray images is different, and recently X-ray tomography (CT) apparatuses are also used. [0003] Through X-rays, it is relatively easy to find metal objects that are difficult to pass through X-rays, such as metal weapons such as guns and knives. On the other hand, substances such ...

Claims

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Application Information

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IPC IPC(8): G21K4/00
CPCG01T1/202G21K4/00C09K11/7771G21K2004/08G21K2004/06
Inventor 小柳津英二林诚
Owner KK TOSHIBA
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