Cesium Iodide Scintillator Panel for X-ray Detection

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Solution Overview

Problem

Current X-ray detection panels using thallium-doped cesium iodide scintillator materials are costly due to toxicity and environmental hazards, requiring high safety measures and special recycling, and suffer from low detection sensitivity and image quality issues due to amorphous silicon photoelectric detectors' poor response to ultraviolet light.

Innovation Solution

A detection panel comprising a cesium iodide scintillator layer not doped with thallium, combined with a photoelectric detector featuring a semiconductor layer with a forbidden band width greater than or equal to 2.3 eV, effectively converting X-rays into near ultraviolet light and improving detection sensitivity without the need for toxic materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If thallium-doped cesium iodide scintillator material is used, then detection sensitivity is improved, but manufacturing cost increases and environmental safety deteriorates

Engineering Contradiction:

Improvedetection sensitivityVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent removes thallium doping from the cesium iodide scintillator layer, extracting the harmful element while maintaining detection functionality through alternative materials with appropriate bandgap properties

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the material composition parameter by using pure cesium iodide or cesium iodide doped with non-toxic elements (Na, K, Rb, Cs) instead of thallium-doped cesium iodide, altering the scintillator's optical and electrical characteristics to achieve comparable or improved performance without toxicity

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If thallium-doped cesium iodide scintillator material is used, then detection sensitivity is improved, but environmental safety deteriorates

Engineering Contradiction:

Improvedetection sensitivityVSAvoidenvironmental safety

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful thallium element into a beneficial non-toxic alternative, using pure cesium iodide or cesium iodide doped with alkali metals that provide similar or superior scintillation performance without environmental and health hazards

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent adopts materials that are safer and potentially more cost-effective, eliminating the need for expensive safety measures and special recycling processes required for thallium-containing materials

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Device complexity

If amorphous silicon photoelectric detector is used, then device complexity is reduced, but detection sensitivity deteriorates due to poor ultraviolet light response

Engineering Contradiction:

Improvedevice complexityVSAvoiddetection sensitivity

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent changes the semiconductor material parameter by selecting materials with forbidden band widths of 2.3 eV or greater (such as zinc oxide, zinc oxynitride, gallium nitride, silicon carbide, diamond, or their doped variants), which inherently provide superior ultraviolet and near-ultraviolet light response compared to amorphous silicon

Inventive Principle:

Principle #35Parameter changes

4Measurement precision

If additional optical filters are used to improve image quality, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improveimage qualityVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent enables the semiconductor layer itself to perform the filtering function through its intrinsic bandgap properties, which naturally block unwanted wavelengths while transmitting the desired ultraviolet and near-ultraviolet light, eliminating the need for separate optical filter components

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution reduces fabrication costs, enhances environmental and human safety, and improves image quality by effectively detecting near ultraviolet light, reducing crosstalk, and eliminating the need for additional optical filters.

Implementation Method 1

The scintillator layer is used for converting the X-ray into a light

Methodology Applied

Scientific EffectScintillation: Scintillation

Implementation Method 2

the detector is used for converting the light output by the scintillator layer into an electric signal

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Data Source

PatentUS10274615B2Detection panel and detection apparatus

Publication Date: 2019.04.30 BOE TECHNOLOGY GROUP CO LTD

AI summary

A detection panel and a detection apparatus are provided. The detection panel includes: a cesium iodide scintillator layer, which is not doped with thallium; and a photoelectric detector, which is arranged on a light emission side of the cesium iodide scintillator layer and includes a semiconductor layer; a forbidden band width of a material for forming the semiconductor layer is greater than or equal to 2.3 eV.