Defect-Resistant Plastic Scintillation Radiation Detector Compositions

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional plastic scintillation radiation detectors degrade due to crazing and fogging when exposed to extreme environmental conditions such as temperature variations and water vapor, leading to reduced detection sensitivity and inability to detect radiation over long periods.

Innovation Solution

A scintillating plastic composition resistant to crazing and fogging, comprising primary polymers (40-95 wt%), secondary polymers (1-60 wt%), and fluors (0.1-50 wt%), which are formulated into a homogeneous mixture and polymerized, allowing exposure to extreme conditions without defect formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional plastic scintillator materials (polystyrene or polyvinyl toluene) are used, then the detector achieves good initial transparency and detection capability, but the materials degrade over time when exposed to environmental conditions such as water vapor and temperature changes, causing crazing and fogging that reduce detection sensitivity

Engineering Contradiction:

Improvedetection capabilityVSAvoidoperational lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent uses a composite polymer system consisting of a primary polymer (polystyrene or polyvinyl toluene) combined with a secondary polymer (polyethylene glycol or polypropylene glycol). This composite structure provides both the initial detection capability of the primary polymer and the environmental stability of the secondary polymer, preventing crazing and fogging while maintaining scintillation performance over extended periods.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the detector is protected from environmental conditions, then the detection capability is maintained, but this precludes the use of detectors in environments where radiation detection is necessary, particularly via prolonged observation

Engineering Contradiction:

Improvedetection capabilityVSAvoidenvironmental adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent modifies the chemical composition parameters of the scintillator material by incorporating glycol-based polymers with specific molecular weight ranges and concentrations. This compositional change enables the material to withstand environmental conditions (humidity, temperature variations) that would normally degrade conventional scintillators, thereby expanding operational environments without sacrificing detection capability.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional single-polymer scintillator compositions are used, then the fabrication process is simple, but the detectors exhibit surface defects via crazing and bulk defects via fogging when exposed to extreme environmental conditions

Engineering Contradiction:

Improvefabrication simplicityVSAvoiddefect resistance

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent introduces a secondary polymer component specifically targeted at regions prone to environmental degradation (surface and bulk interfaces). The secondary polymer (polyethylene glycol or polypropylene glycol) is formulated in specific concentrations (0.1-10% by weight) to provide localized protection against crazing and fogging, while the primary polymer maintains the bulk scintillation properties. This localized functional differentiation improves defect resistance without significantly complicating the overall fabrication process.

Inventive Principle:

Principle #3Local quality

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 scintillating plastic maintains initial detection efficiency and transparency even after exposure to harsh environmental conditions, preventing light scattering and extending the detector's operational lifespan without performance degradation.

Implementation Method 1

plastic scintillation radiation detector

Methodology Applied

Scientific EffectScintillation: Scintillation

Implementation Method 2

one or more fluors present in an amount ranging from about 0.1 wt % to about 50 wt %

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS12129414B2Defect-resistant plastic scintillation radiation detector compositions and fabrication methods

Publication Date: 2024.10.29 LAWRENCE LIVERMORE NAT SECURITY LLC

AI summary

Scintillating plastics resistant to crazing and fogging, methods of making and using the same are disclosed. The scintillating plastics include: one or more primary polymers present in an amount ranging from about 40 wt % to about 95 wt %; one or more secondary polymers present in an amount ranging from about 1 wt % to about 60 wt %; and one or more fluors present in an amount ranging from about 0.1 wt % to about 50 wt %. Methods of making such plastics include: creating a homogenous mixture of precursor materials including primary polymer, secondary polymer, and fluor in the amounts set forth above; and polymerizing the homogenous mixture. Methods of using such plastics include: exposing the scintillating plastic to one or more extreme environmental conditions for a predetermined amount of time without generating crazing or fogging within the scintillating plastic. Various additional features and specific embodiments of these inventive concepts are also disclosed.