Gd2O3 Neutron Detector on Flexible Substrate

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Solution Overview

Problem

Current nuclear radiation detectors lack robustness, flexibility, and efficient neutron detection capabilities, particularly in applications requiring covert detection and multiple sensing modes, with a need for materials exhibiting high neutron capture cross sections and visible transparency.

Innovation Solution

A solid-state nuclear radiation detector utilizing a gadolinium-oxide (Gd2O3) active material layer on a flexible substrate, enabling detection of fast and thermal neutrons, charged particles, and multiple detection modes through electrical properties, with the ability to be integrated into transparent, flexible, and multifunctional designs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional nuclear radiation detectors are used, then radiation detection capability is provided, but robustness and flexibility are insufficient

Engineering Contradiction:

ImproverobustnessVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent employs flexible polymer substrates (such as polyethylene terephthalate or polyvinylidene fluoride) as the base material for the detector, replacing traditional rigid structures. This allows the detector to be bent, folded, and conform to various surfaces while maintaining structural integrity and detection functionality, directly addressing the need for both robustness and flexibility

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The detector utilizes composite material structures combining polymer substrates with neutron-sensitive materials (such as boron-containing compounds or gadolinium-oxide) and conductive layers. This composite approach enables the integration of mechanical flexibility from polymers with detection functionality from specialized materials, achieving both robustness and adaptability simultaneously

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional detector materials are used, then basic detection is achieved, but neutron detection efficiency is insufficient

Engineering Contradiction:

Improvedetection efficiencyVSAvoidmaterial performance

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent incorporates neutron-sensitive materials (such as boron-10 containing compounds or gadolinium-oxide) in specific regions or layers of the detector structure where neutron interaction is most effective. This localized concentration of high-cross-section materials optimizes neutron detection efficiency without requiring uniform distribution throughout the entire detector, reducing material quantity while maintaining high performance

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The detector design modifies material parameters by selecting substances with exceptionally high neutron capture cross-sections (such as gadolinium-oxide with cross-section exceeding 49,000 barns). This parameter optimization enables highly efficient neutron detection using minimal material quantities, directly resolving the contradiction between detection efficiency and material quantity

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If detectors are made visible for operation, then detection function is provided, but covert detection capability is lost

Engineering Contradiction:

Improvedetection functionVSAvoiddetectability

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent employs transparent or translucent polymer substrates and clear protective coatings that allow visible light to pass through. This optical transparency enables the detector to remain visually inconspicuous or completely invisible in its operational state, while maintaining full detection functionality through the transparent material, thus achieving covert detection capability without compromising ease of operation

Inventive Principle:

Principle #32Color changes

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 Gd2O3-based detector offers enhanced neutron detection efficiency, robustness, and flexibility, allowing for covert operation and multiple detection modes, with significant conductivity changes and real-time monitoring capabilities, suitable for various applications including covert detection and forensic analysis.

Implementation Method 1

a substrate layer for detecting at least fast neutrons associated with a radiation source

Methodology Applied

Scientific EffectNuclear reaction: Nuclear Fission

Implementation Method 2

An active material layer is deposited onto the substrate layer and detects at least thermal neutrons associated with the radiation source

Methodology Applied

Scientific EffectNeutron capture: Nuclear Fission

Implementation Method 3

at least two separate detection modes using electrical properties of the substrate and active material layers for detecting a type of radiation associated with the radiation source

Methodology Applied

Scientific EffectConductivity change: Conduction (electrical)

Data Source

PatentUS8674314B2Solid-state nuclear detector

Publication Date: 2014.03.18 THE PENN STATE RES FOUND INC

AI summary

The present invention provides an innovative solid-state neutron detector that exhibits superior neutron-sensitivities. One embodiment of the present invention includes a Gadolinium-oxide (Gd2O3)-based neutron detector that is highly sensitive to the presence of neutrons, and experiences significant changes in film conductivity, capacitance or both as a result of thermal neutron exposure thereby providing for detection of nuclear radiation.