Stacked Neutron Detector Layers for Compact High-Efficiency Detection
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Solution Overview
Problem
Conventional neutron detectors, particularly those using helium-3, are large, require high voltage, and have limited availability, while solid-state detectors have lower detection efficiency due to their design, which can be cumbersome and inefficient.
Innovation Solution
A neutron detector design featuring stacked layers of converter material and detector material, with a read out integrated circuit (ROIC) electronically coupled to each layer, allowing for increased detection efficiency by ensuring that even neutrons passing through one layer can interact with subsequent layers, thereby enhancing detection chances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface area of the layer of high neutron cross-section material is increased to increase detection efficiency, then the number of neutrons that interact with the layer increases, but the detector becomes large and cumbersome
Solution Approach 1:
The patent transitions from a planar detector design to a three-dimensional stacked layer architecture. Multiple converter layers and detector layers are arranged in vertical stacking, enabling neutrons to interact with multiple converter layers at different depths. This vertical dimensionality allows increased detection efficiency without proportionally increasing the detector's footprint area, as the active volume is expanded in the depth direction rather than spreading laterally.
Solution Approach 2:
The detector is divided into multiple discrete converter layers separated by detector layers. Each converter layer contains high neutron cross-section material and can independently interact with neutrons. This segmentation allows the total converter material volume to be distributed across multiple thin layers, increasing the probability of neutron interaction while maintaining a compact overall structure that is manageable in size.
2Reliability
If conventional helium-3 tubes are used to detect neutrons, then detection can be achieved, but the tubes are large and require relatively high voltage for operation
Solution Approach 1:
The patent replaces the helium-3 gas-filled tube detection mechanism with a solid-state detector system. Instead of using gas ionization in helium-3 tubes that require high voltage operation, the invention uses solid semiconductor detector layers that can operate at lower voltages. The converter layers transform neutron interactions into charged particles that are detected by the solid-state detectors, eliminating the need for high-voltage gas tube operation.
3Volume of moving object
If solid-state neutron detectors with a layer of high neutron cross-section materials are used, then availability and size are improved, but detection efficiency is lower than helium-3 detectors
Solution Approach 1:
The patent creates a composite structure combining converter materials with high neutron cross-section (such as boron-10 or lithium-6) with solid-state detector materials (semiconductor layers). This composite architecture allows the converter layers to capture neutrons efficiently while the integrated detector layers immediately detect the resulting charged particles. The close coupling of converter and detector materials in alternating layers ensures high detection efficiency while maintaining the compact solid-state form factor.
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 stacked design significantly increases detection efficiency by ensuring that more neutrons are detected, reducing the size and complexity of the detector while maintaining high performance.
Implementation Method 1
Each layer of converter material may be immediately adjacent to at least one layer of detector material... Each layer of boron-10 generates an alpha particle when a neutron interacts with the layer of boron-10 by nuclear reaction
Data Source
AI summary
A neutron detector including a plurality of layers of converter material and a plurality of layers of detector material. Each layer of converter material can be immediately adjacent to at least one layer of detector material and each layer of detector material can be immediately adjacent to at least one layer of converter material. The neutron detector may further include a read out integrated circuit (ROIC) that is electrically coupled to the plurality of layers of detector material. A value output by the ROIC may be indicative of a neutron interacting with a layer of converter material from amongst the plurality of layers of converter material.