Pixel Electrode Layout for High-Resolution Gas Radiation Detection
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Solution Overview
Problem
Conventional radiation detection devices using pixel-type electrodes face a decrease in gas amplification factor when the pitch of pixel electrodes is reduced to improve resolution.
Innovation Solution
A radiation detection element with pixel electrodes arranged in a row and column direction, where the pitch is 380 µm or less, and an area ratio between the first and second electrodes falls within a specific range, maintaining gas amplification while improving resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pitch of pixel electrodes is reduced to improve resolution, then the resolution is improved, but the gas amplification factor decreases
Solution Approach 1:
The invention applies different geometric configurations to different parts of the pixel electrode structure. Specifically, it optimizes the ratio between the area of the first electrode (S1) and the second electrode (S2) to create localized electric field characteristics that maintain high gas amplification even at reduced pitch. This local optimization of electrode area ratio allows each pixel to maintain effective gas amplification while enabling overall higher resolution through smaller pitch dimensions.
Solution Approach 2:
The invention changes the geometric parameters of the pixel electrodes, specifically the area ratio S1/S2, to resolve the contradiction. By establishing that this ratio falls within 0.006 to 0.06 (or equivalently, the area ratio between first and second electrodes is 16.7:1 to 154.6:1), the invention enables the pitch to be reduced to 380 µm or less while maintaining the gas amplification factor at 2000 or more. This parameter optimization allows simultaneous achievement of high resolution and high gas amplification.
2Measurement precision
If the pitch of pixel electrodes is reduced, then the resolution is improved, but discharge occurs between electrodes
Solution Approach 1:
The invention optimizes the geometric parameters of the pixel electrodes, specifically controlling the area ratio between the first electrode (S1) and second electrode (S2) to fall within 0.006 to 0.06. This parameter optimization, combined with maintaining pitch at 380 µm or less, creates an electric field distribution that prevents local field concentration strong enough to cause discharge. The optimized geometry allows reduced pitch for high resolution while avoiding harmful discharge effects.
3Measurement precision
If the pitch of pixel electrodes is reduced, then the resolution is improved, but the applied voltage must be increased
Solution Approach 1:
The invention optimizes the electrode geometry parameters, specifically the area ratio S1/S2 within 0.006 to 0.06, to create an efficient electric field configuration. This geometric optimization enables the system to achieve high resolution with pitch ≤380 µm while maintaining gas amplification factor ≥2000 at applied voltage ≤500 V. The optimized electrode areas maximize the electric field efficiency, allowing lower operating voltages compared to conventional designs with the same resolution.
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 allows for improved resolution without reducing the gas amplification factor, preventing discharge and maintaining high gas amplification even at lower voltages.
Implementation Method 1
A radiation detection device using gas amplification by pixel-type electrodes has been studied
Data Source
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AI summary
It is an object to provide a radiation detection device that has improved resolution without a reduction in gas amplification. According to one embodiment of the present invention, there is provided a radiation detection element includes a plurality of pixel electrodes, each pixel electrodes including a first electrode placed on the first surface of an insulating member and having an opening portion and a second electrode placed at the opening portion of the first electrode. The plurality of pixel electrodes is arrayed in the row direction and the column direction. The pitch of the pixel electrodes in the row direction and the column direction is 380 µm or less. An area ratio between the first electrode and the second electrode falls within the range of 14.5:1 to 154.6:1.