Silicon Substrate Radiation Detector with Segmented Sensor Media
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Solution Overview
Problem
Current radiation detectors face challenges in achieving favorable tradeoffs between cost, sensitivity, spectral discrimination, spatial discrimination, and energy consumption, particularly in radiological surveillance and medicine applications, where existing designs are inadequate for alpha, beta, and gamma particle detection.
Innovation Solution
The development of a radiation detection apparatus featuring a wafer-like substrate with sensors and sensor media, where sensors are optically or electrically coupled to the substrate, and an electronic signal-processing circuit produces outputs from interactions with impinging radiation, allowing for charge and light collection and discrimination of radioactive particles based on interaction products and penetration depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radiation detector designs are used, then detection capability is maintained, but sensitivity and spatial resolution are insufficient for modern applications
Solution Approach 1:
The detector is divided into multiple sensor media layers (first sensor medium, second sensor medium, etc.) stacked vertically, with each layer detecting different radiation types or energy ranges. This segmentation enables enhanced sensitivity for specific radiation types while maintaining manageable complexity through modular design
Solution Approach 2:
The patent transitions from traditional single-plane detection to a three-dimensional stacked architecture where sensor media are arranged in vertical layers. This dimensional change enables simultaneous detection of multiple radiation types (alpha, beta, gamma, neutrons) with high spatial resolution without proportionally increasing planar complexity
2Adaptability or versatility
If multiple radiation types are detected simultaneously, then versatility is improved, but discrimination between particle types becomes difficult
Solution Approach 1:
Each sensor medium layer is designed with specific material properties optimized for detecting particular radiation types (e.g., certain materials for alpha particles, others for gamma rays). This local optimization of material quality in each layer enables simultaneous detection of multiple radiation types while maintaining clear spectral discrimination through characteristic signal patterns from each layer
Solution Approach 2:
The detector employs composite structures with different sensor media materials stacked together, where each material is selected for its specific interaction characteristics with different radiation types. This composite approach enables versatile detection across multiple radiation types while maintaining discrimination through the unique response signatures of each material layer
3Measurement precision
If high spatial resolution is achieved, then imaging ability is improved, but energy consumption increases
Solution Approach 1:
The sensor media are designed to directly convert radiation interactions into detectable signals through their inherent physical properties (e.g., scintillation, ionization), minimizing the need for external energy-intensive conversion systems. This self-service approach achieves high spatial resolution through the natural response characteristics of the sensor media while reducing overall energy consumption
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 enhances sensitivity, spatial resolution, and energy deposition information collection, enabling dual-mode detection and three-dimensional imaging, while allowing for interchangeable sensor media and customizable geometries, improving detection capabilities for various types of radiation.
Implementation Method 1
a sensor is stimulated by a product of an interaction between the sensor medium and impinging radiation
Data Source
AI summary
Apparatus for detecting radiation includes a sensor medium disposed within a cavity in a silicon-based substrate. An electrode arrangement is provided for collecting charge generated within the sensor medium by interactions with impinging radiation and drifted through the sensor medium. The electrode arrangement is constituted, in part, by a silicon portion of the substrate that is doped to increase its electrical conductivity and that defines part of the cavity wall.