Scintillator Plate Phase Separation Light Scattering
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Solution Overview
Problem
The resolution of scintillator plates used in flat-panel detectors deteriorates due to light scattering between columnar crystals, which occurs when the crystals are not sufficiently separated during film formation, leading to reduced image quality.
Innovation Solution
A scintillator plate with a base material of halogenated alkali metal compounds and an activating agent, where a phase-separated layer is formed on the substrate, comprising a first phase of the halogenated alkali metal compound and a second phase of a different material, which helps in maintaining the separation of columnar crystals and reducing light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If columnar crystals are formed during film formation, then the scintillator can efficiently transfer light to the light-receiving element, but the crystals are not sufficiently separated leading to light scattering between crystals
Solution Approach 1:
The invention introduces a binder material that segments the columnar crystals by filling the gaps between them, creating a phase-separated structure where crystals are distinct and separated. This prevents light scattering between crystals while maintaining the columnar structure for efficient light transfer.
Solution Approach 2:
The binder material acts as an intermediary substance between the columnar crystals. It mediates the interaction between crystals by filling gaps and preventing direct optical coupling, thereby eliminating light scattering while preserving the overall columnar architecture.
2Manufacturing precision
If the diameter of columnar crystals is reduced to maintain gaps between crystals, then resolution is improved, but the scintillator performance deteriorates
Solution Approach 1:
The invention changes the physical and chemical parameters of the crystal formation process by introducing the binder material. This allows crystals to maintain larger diameters without fusion while still being separated, thus preserving both resolution and scintillator performance simultaneously.
3Illumination intensity
If alkali metal halide is used as scintillator material, then light emission is achieved, but deliquescency causes fusion of columnar crystals leading to resolution deterioration
Solution Approach 1:
The binder material provides beforehand cushioning protection against deliquescency-induced fusion. By pre-filling the gaps between crystals with the binder, it creates a protective barrier that prevents crystal fusion even when the alkali metal halide undergoes deliquescency, thus maintaining resolution and crystal structure stability.
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 configuration effectively suppresses light scattering between columnar crystals, thereby improving the resolution of the scintillator plate and maintaining image quality.
Implementation Method 1
a layer which is in contact with the substrate and in which a first phase composed of the halogenated alkali metal compound and a second phase composed of a material different from the base material and the activating agent are phase-separated
Implementation Method 2
total reflection of the light is repeated in the crystal due to a difference in the refractive index between the crystal and the air so that the emitted light can be effectively guided to the light-receiving element
Implementation Method 3
there is an indirect conversion FPD which converts radiation passed through an object to light by using a scintillator (radiation detection material)
Data Source
AI summary
A layer in which a primary phase composed of a columnar crystal material and a secondary phase composed of a material different from the primary phase are phase-separated being included as a base for forming a columnar crystal of scintillator plate improves separation of columnar crystals from each other and suppresses light scattering from occurring so as to realize a scintillator having high resolution.