Neutron Detector Electron Amplifier Structure

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Solution Overview

Problem

Current neutron detectors, particularly those using microchannel plates (MCPs), face challenges in achieving high detection efficiency and fine spatial resolution due to limited neutron sensitive nuclide density and high costs, which restricts their scalability and application in large areas, especially for detecting various types of neutrons.

Innovation Solution

An enhanced electron amplifier structure is developed with a neutron sensitive layer on its upper surface, composed of materials like 10B-doped Al2O3, which interacts with incident neutrons to eject electrons, and a substrate that amplifies these electrons through secondary emissions, increasing the detector's sensitivity and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional MCPs with lead glass and limited neutron sensitive nuclide density are used, then detection efficiency is constrained, but increasing nuclide density through doping is limited by production process constraints and remains expensive

Engineering Contradiction:

Improveneutron detection efficiencyVSAvoidproduction process complexity and cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention separates the neutron sensitive layer from the MCP substrate, allowing independent optimization of each component. The neutron sensitive layer can be fabricated with high nuclide density using appropriate techniques while the MCP structure maintains its electron amplification function, resolving the contradiction between detection efficiency and manufacturability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates a composite structure combining a neutron sensitive layer (with high nuclide density materials) and an MCP substrate. This composite approach allows the system to achieve both high neutron detection efficiency from the sensitive layer and effective electron amplification from the MCP, while avoiding the limitations of trying to dope high concentrations into traditional lead glass MCPs

Inventive Principle:

Principle #40Composite materials

2Reliability

If larger detection volumes are used to achieve higher detection efficiency, then spatial resolution degrades due to longer ionization tracks and scattering

Engineering Contradiction:

Improveneutron detection efficiencyVSAvoidspatial resolution

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The invention adds a dimensional separation by placing the neutron sensitive layer as a distinct surface layer on the MCP. This allows the interaction volume to be optimized for neutron detection while the MCP channel structure maintains fine spatial resolution through its geometric constraints, effectively decoupling the two competing requirements

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If pressurized gas systems are used for neutron detection, then detection efficiency can be improved, but explosion hazards are introduced

Engineering Contradiction:

Improveneutron detection efficiencyVSAvoidexplosion hazard

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention replaces expensive and hazardous pressurized gas systems with a solid-state neutron sensitive layer on an MCP. This solid-state approach eliminates explosion hazards while maintaining detection efficiency, and the modular structure allows for cost-effective fabrication and replacement if needed

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 the sensitivity and detection efficiency of neutron detectors, enabling the production of large-area, high-efficiency neutron detectors with improved spatial resolution and selectivity for different types of neutrons, while reducing costs and overcoming material shortages.

Implementation Method 1

The neutron sensitive layer is configured to interact with incident neutrons and subsequently, eject electrons due to the interaction

Methodology Applied

Scientific EffectNeutron capture and electron emission:

Implementation Method 2

The substrate is configured to amplify a signal of the ejected electrons by causing a cascade of secondary electron emissions

Methodology Applied

Scientific EffectSecondary electron emission and electron multiplication: Electron Avalanche

Data Source

PatentUS10180508B1Enhanced neutron detector and electron amplifier structure and a method of fabricating the enhanced neutron detector and electron amplifier structure

Publication Date: 2019.01.15 UCHICAGO ARGONNE LLC

AI summary

An enhanced electron amplifier structure includes a substrate configured to amplify a signal of an incident particle by causing a cascade of secondary electron emissions and an enhancement layer configured to increase a sensitivity of the substrate to the incident particle. The enhancement layer is provided on an upper surface of the substrate.