Radiation Detection Element With Gradient Electrodes for 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 radiation detection element incorporates a third electrode surrounding the second electrode, with a voltage applied to create a changing potential from the third electrode to the second electrode, generating an electric field that facilitates the movement of electric charges to the first electrode, and uses a collimator to shield areas with weak electric fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement 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 patent changes the electric field distribution parameters by introducing a third electrode and applying specific voltages to create a potential gradient that enhances charge collection in previously weak field regions, thereby expanding the effective sensitive region without compromising detection accuracy
Solution Approach 2:
The third electrode acts as an intermediary element between the second electrode and the periphery of the semiconductor portion, creating intermediate potential levels that facilitate gradual charge transport from peripheral regions to the signal output electrode
2Measurement precision
If the potential difference between the electrode and barrier electrode is increased, then it becomes easier for electric charges to gather at the signal output electrode, but the potential difference becomes unstable
Solution Approach 1:
The patent segments the electric field enhancement into multiple stages by introducing the third electrode as an intermediate structure, allowing the potential difference to be distributed across multiple smaller gradients rather than one large unstable gradient
Solution Approach 2:
The third electrode serves as a mediator that stabilizes the potential distribution by providing intermediate potential levels, preventing direct large potential differences that would cause instability while still enabling effective charge collection
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 gathered effectively at the signal output electrode, even in previously non-sensitive areas.
Implementation Method 1
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
Implementation Method 2
When radiation is incident on the semiconductor portion, electric charges are generated inside the semiconductor portion
Data Source
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AI summary
Provided are a radiation detection element, a radiation detector, and a radiation detection apparatus capable of increasing a sensitive region. 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.