Monolithic SiC Telescopic Detector for Microdosimetry
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Solution Overview
Problem
Existing ionizing radiation dosimeters, particularly those with ionization chambers or solid-state detectors, face challenges in microdosimetric applications due to poor radiation resistance and low accuracy in measuring local energy deposits at the cellular or sub-cellular level, which are crucial for radiobiological studies.
Innovation Solution
A monolithic telescopic detector with a multilayer planar structure using silicon carbide (SiC) epitaxial layers is developed, featuring two detector stages in sequence, allowing for precise identification of atomic number and dose measurement on micrometric and nanometric scales, with enhanced radiation resistance and ease of production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ionization chambers or solid-state detectors are used, then functional measurement capability is achieved, but radiation resistance and measurement accuracy in microdosimetric applications deteriorate
Solution Approach 1:
The patent employs silicon carbide (SiC) as the detector material, which is a composite semiconductor material combining the advantages of silicon (成熟的工艺) and diamond (high radiation resistance). This composite material approach enables the detector to maintain high measurement precision in microdosimetric applications while achieving superior radiation resistance compared to traditional materials.
Solution Approach 2:
The detector is divided into multiple epitaxial layers with different doping types and concentrations (n-type, p-type layers with varying concentrations). This segmentation allows each layer to perform specific functions in the detection process, improving both radiation resistance through optimized charge carrier collection and measurement precision through enhanced signal discrimination.
2Manufacturing precision
If monolithic multilayer planar structure with epitaxial layers is used, then manufacturing precision and radiation resistance are improved, but device complexity increases
Solution Approach 1:
The patent utilizes controlled changes in epitaxial growth parameters (temperature, pressure, doping concentration, layer thickness) during the manufacturing process to achieve precise control over the multilayer structure. By optimizing these parameters, high manufacturing precision is achieved while the complexity is managed through systematic process control rather than ad hoc adjustments.
Solution Approach 2:
The multilayer epitaxial structure serves multiple functions simultaneously: radiation detection, charge carrier generation, charge separation, and signal amplification. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving high manufacturing precision through integrated design.
3Measurement precision
If telescope configuration with two detector stages is implemented, then radiation type identification capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges two detector stages into a single monolithic SiC substrate with integrated epitaxial layers, rather than using separate detectors. This combining approach maintains the telescope configuration's ability to identify radiation types through energy loss measurements while significantly simplifying manufacturing compared to assembling multiple discrete detector components.
Solution Approach 2:
The use of silicon carbide as a unified composite material for both detector stages enables monolithic fabrication techniques, reducing manufacturing complexity. The epitaxial growth process allows both stages to be created in a single continuous manufacturing run, improving ease of production while maintaining precise atomic number identification capability.
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 detector provides accurate and reliable measurements of radiation type and dose on micrometric scales, demonstrating superior radiation resistance and versatility for microdosimetric applications, suitable for radiobiological studies and clinical beam dosimetry.
Implementation Method 1
A detector in this context is an apparatus which, in the presence of an ionizing radiation incident on its active surface and crossing its active volume, reacts producing a certain amount of charge within said active volume
Data Source
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AI summary
The present invention relates to a silicon carbide telescopic detector for ionizing radiation or a measuring instrument equipped with such a telescopic detector for identifying the type of ionizing radiation and/or measuring a dose released by the radiation, a detector production procedure, as well as uses and original methods which use the detector.