Copper Substrate Radiation Detector Backscattering Reduction
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Solution Overview
Problem
Radiation image detecting devices using the ISS method face issues with backscattering due to substrates like aluminum, which degrades image sharpness and increases weight, and require moisture-resistant scintillators, especially in portable devices.
Innovation Solution
A radiation image detecting device with a substrate made of materials with atomic numbers 20-31, such as copper, forming columnar crystals on a box-shaped substrate, and a photodetector opposed to the tip ends of these crystals, sealed within a housing to reduce backscattering and enhance moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an aluminum substrate is used in the ISS method radiation image detecting device, then the device can be manufactured with common materials, but backscattering increases and image sharpness degrades
Solution Approach 1:
The invention changes the material parameter of the substrate from aluminum (atomic number 13) to materials with atomic numbers 20-31 such as copper (29), nickel (28), or cobalt (27). This parameter change reduces the backscatter coefficient, thereby reducing radiation backscattering and improving image sharpness while maintaining manufacturing feasibility.
2Object-affected harmful factors
If a radiation absorbing layer made of high atomic number material is provided to reduce backscattering, then backscattering is reduced, but weight increases
Solution Approach 1:
Instead of using high atomic number materials (atomic number 50 or more) like lead or tungsten that would significantly increase weight, the invention changes the substrate material parameter to mid-range atomic numbers (20-31). This provides sufficient backscattering reduction while keeping the weight increase minimal, making the device suitable for portable applications.
3Manufacturing precision
If columnar crystals are formed on the substrate to improve light guidance, then image sharpness is improved, but moisture resistance becomes a concern
Solution Approach 1:
The invention uses a composite structure combining a substrate made of materials with atomic numbers 20-31 (such as copper, nickel, or cobalt) with columnar crystal scintillators. This composite material approach maintains the image sharpness improvement from columnar crystals while the specific substrate materials provide enhanced moisture resistance compared to conventional aluminum substrates.
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
The solution effectively reduces backscattering without increasing weight, improves image sharpness, and enhances the moisture resistance of the scintillator, making it suitable for portable devices like electronic cassettes.
Implementation Method 1
The scintillator is a phosphor layer of CsI, GOS (Gd2O2S; Tb), or the like, and converts the radiation image into the optical image
Implementation Method 2
The photodetector converts light radiating from the scintillator into electric charge by each PD
Implementation Method 3
light propagates through the same columnar crystal by a light guide effect of the columnar crystal. The columnar crystals prevent dispersion of the light produced in the scintillator
Data Source
AI summary
A substrate is made of copper having an atomic number of 29. The substrate is formed in the shape of a box without a top, and has a rectangular bottom and sidewalls erected at four sides surrounding the bottom. A scintillator is evaporated onto the bottom. The scintillator includes a non-columnar crystal and a plurality of columnar crystals erected by crystal growth. A photodetector tightly adheres to top surfaces of the sidewalls of the substrate through an O-ring, so as to close the top of the box-shaped substrate. The substrate, the photodetector, and the O-ring seal the scintillator in an air-tight manner.