Radiation Detector Electrode Layout for Wider Charge Collection
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Solution Overview
Problem
Conventional radiation detection elements have limited sensitive regions due to weak electric fields at the periphery of signal output electrodes, leading to reduced radiation detection accuracy and efficiency.
Innovation Solution
The introduction of a third electrode surrounding the second electrode, with a voltage applied to create a changing potential, enhances the electric field to facilitate the gathering of electric charges at the first electrode, and the use of multiple third electrodes at varying distances to increase the potential difference, along with a collimator to shield non-sensitive regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a barrier electrode is provided on the outside of the electrode for applying voltage to increase the potential difference, then it becomes easier for electric charges to gather at the signal output electrode, but the potential difference becomes unstable when the electrode and barrier electrode are insulated from each other
Solution Approach 1:
The barrier electrode is divided into multiple segments (first barrier electrode and second barrier electrode) that are spatially separated and independently positioned around the signal output electrode. This segmentation allows each segment to contribute to the overall electric field while maintaining structural stability, resolving the contradiction between enhancing charge gathering and ensuring potential stability.
Solution Approach 2:
Multiple barrier electrode segments are combined to form a complete circular barrier structure around the signal output electrode. This merging of separate elements creates a unified electric field configuration that simultaneously achieves high potential difference for charge gathering and structural stability for potential maintenance.
2Measurement precision
If a collimator is used to cover parts where electric charges are less likely to be gathered, then radiation detection accuracy is improved, but the sensitive region is reduced
Solution Approach 1:
The electric field strength is made non-uniform by positioning barrier electrodes at specific locations around the signal output electrode. This creates locally enhanced electric fields in regions where charges need gathering assistance, while maintaining a larger overall sensitive region compared to collimator-based solutions.
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 enlarges the sensitive region, improving radiation detection efficiency and accuracy by ensuring electric charges are effectively gathered at the signal output electrode, even in previously non-sensitive areas.
Implementation Method 1
When a voltage is applied, an electric field is generated inside the semiconductor portion. When radiation is incident on the semiconductor portion, electric charges are generated inside the semiconductor portion, the electric charges move along by the electric field and are gathered at the signal output electrode
Implementation Method 2
a voltage is applied to the second electrode and the third electrode so that a potential changes from the third electrode to the second electrode. An electric field in which a potential changes from the third electrode toward the second electrode is generated near the incident surface, and electric charges generated by incidence of radiation are moved by the electric field
Implementation Method 3
Conventionally, a collimator has been used to cover a part where the generated electric charges are less likely to be gathered in the signal output electrode. The collimator prevents incidence of radiation on a part where the electric field is weak
Data Source
AI summary
A radiation detection element including a semiconductor portion having an incident surface onto which radiation is incident, a first electrode which is provided on a rear surface of the incident surface and into which electric charges generated in the semiconductor portion by incidence of radiation flow, and a second electrode provided on the incident surface, located on a rear side of the first electrode, and being applied a voltage required for causing the electric charges to flow into the first electrode includes a third electrode provided on the incident surface and disposed at a position surrounding the second electrode, wherein the third electrode is electrically connected to the second electrode, and a voltage is applied to the second electrode and the third electrode so that a potential changes from the third electrode to the second electrode.