Solid-State Detector with Potential Well for Low-Dose Radiation
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Solution Overview
Problem
Conventional radiation detection methods face challenges in achieving high sensitivity while maintaining low radiation doses, particularly for X-rays and proton radiation, and often compromise on spatial resolution or energy range.
Innovation Solution
The method involves using a photoelectric solid-state detector with a photoconductor section and a potential well section, where the radiation dose is adjusted to be below the response threshold of the photoconductor section, allowing the detector to operate in the sensitivity range of the potential well section, which generates a measurable signal with significantly reduced radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional solid-state detectors are used for radiation detection, then spatial resolution is improved, but sensitivity at low radiation doses deteriorates
Solution Approach 1:
The detector is divided into functionally distinct regions: a photoconductor section for spatial localization and a potential well section for sensitive charge carrier collection. This segmentation allows each region to specialize in its optimal function, resolving the contradiction between spatial resolution and low-dose sensitivity
Solution Approach 2:
The potential well section acts as an intermediary structure that receives charge carriers generated in the photoconductor section and transports them to the readout electrode. This intermediary mechanism enables sensitive detection at low doses while preserving the spatial resolution capabilities of the photoconductor
2Object-affected harmful factors
If radiation dose is reduced for sample safety, then radiation protection is improved, but detection sensitivity deteriorates
Solution Approach 1:
The detector operates by changing the operational parameter from relying on bulk photoconductor response (which requires high doses) to utilizing potential well section response (which is sensitive at low doses). This parameter change enables detection at radiation doses several orders of magnitude lower than conventional detectors
3Measurement precision
If photoconductor section response threshold is used for detection, then measurable signal is achieved, but radiation dose requirement increases
Solution Approach 1:
The invention extracts the detection function from the bulk photoconductor material and relocates it to the potential well section. By taking out the charge carrier collection function and placing it in the potential well, the system achieves measurable signals at much lower radiation doses than would be required by conventional photoconductor-only detectors
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 approach enables detection with a reduced radiation dose rate, minimizing sample exposure by several orders of magnitude and allowing for faster measurement times in medical imaging and computed tomography, while maintaining high sensitivity.
Implementation Method 1
Each photoconducting section has a response threshold above which the radiation-induced generation of charge carriers occurs
Data Source
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AI summary
A method for detecting radiation during the examination of a sample (1) comprises the steps of generating the radiation, more particularly X-ray radiation or proton radiation, by means of a source device (10), passing the radiation through the sample (1), and detecting the radiation by means of at least one photoelectric solid-state detector (20) containing a photoconduction section having a predetermined response threshold and a potential well section for taking up free charge carriers. The solid-state detector (20) is a GaN- or GaAs-based semiconductor detector and the potential well section contains a two-dimensional electron gas (2DEG). A setting of the radiation is provided in such a way that the solid-state detector (20) is operated separately from the response threshold of the photoconduction section and in a sensitivity range of the potential well section. An examination device (100) is also described, said examination device being configured for an examination of a sample (1) using radiation, more particularly X-ray radiation or proton radiation.