Z-Graded Coating Layers for Gamma Radiation Shielding

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Solution Overview

Problem

Current radiation shielding materials, such as lead-filled aprons, are heavy, bulky, and pose environmental concerns due to the need for recycling and potential contamination. Additionally, they require significant weight for equivalent radiation protection, which is undesirable.

Innovation Solution

The development of articles with Z-grade material coatings, comprising multiple layers of materials with varying atomic numbers, applied to substrates such as textiles. This configuration enhances gamma radiation shielding while reducing weight and environmental impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If lead-filled aprons are used for gamma radiation protection, then radiation shielding effectiveness is achieved, but weight and bulk increase significantly

Engineering Contradiction:

Improveradiation shielding effectivenessVSAvoidweight of protective equipment

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The shielding material is segmented into multiple layers with different atomic number characteristics. The patent uses a composite structure with an inner layer (higher Z material) and an outer layer (lower Z material), dividing the shielding function into segments that work together to reduce radiation while minimizing weight compared to solid lead aprons.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs composite materials combining elements of different atomic numbers in a layered configuration. This composite structure leverages the photoelectric absorption properties of high-Z materials and the scattering properties of low-Z materials to achieve superior shielding per unit weight, directly addressing the weight-effectiveness contradiction.

Inventive Principle:

Principle #40Composite materials

2Reliability

If lead-filled elastomeric resins are used, then radiation protection is provided, but environmental contamination risks increase

Engineering Contradiction:

Improveradiation protectionVSAvoidenvironmental contamination

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the harmful lead component from the shielding material and replaces it with alternative materials having appropriate atomic numbers. By removing lead entirely and using non-toxic substitute materials in a layered configuration, the invention maintains radiation protection functionality while eliminating environmental contamination risks associated with lead disposal and degradation.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If increased filler weight fraction is used in lead-filled resins, then radiation shielding improves, but elastomeric properties and strength are lost

Engineering Contradiction:

Improveradiation shieldingVSAvoidelastomeric properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The shielding function is segmented between two distinct layers rather than attempting to achieve it through high filler content in a single elastomeric matrix. This segmentation allows each layer to be optimized for its specific function while maintaining the flexibility and strength of the underlying elastomeric substrate, avoiding the strength loss that occurs with high lead filler fractions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the material are assigned different qualities: the inner layer uses higher-Z materials optimized for photoelectric absorption, while the outer layer uses lower-Z materials optimized for scattering. This local differentiation of material properties achieves effective shielding without requiring high filler content throughout the entire material, preserving elastomeric properties and strength.

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 Z-grade material coatings provide improved gamma radiation shielding, offering at least two times greater protection compared to a single layer of lead at the same thickness, while being significantly lighter, thus addressing the weight and environmental concerns of traditional shielding materials.

Implementation Method 1

The atomic number z-shielding approach improves ionizing dose protection from gamma radiation sources by an order of magnitude

Methodology Applied

Scientific EffectPhotoelectric absorption: Photoelectric Effect

Implementation Method 2

Z-graded radiation shielding enables gamma radiation protection from sources typically found at medical facilities

Methodology Applied

Scientific EffectRadiation scattering: Scattering

Data Source

PatentUS12237090B2Radiation shielding articles coated with low and high z materials

Publication Date: 2025.02.25 UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR NAT AERONAUTICS & SPACE ADMINISTRATION

AI summary

Described herein are articles composed of coatings with improved gamma radiation shielding and physical properties. In one aspect, the article is composed of a coating, where the coating includes a first layer composed of a first Z grade material, a second layer composed of a second Z grade material, and a third layer composed of a third Z grade material, wherein the atomic number of the first Z grade material and the third Z grade material is less than the atomic number of the second Z grade material. In one aspect, the substrate of the article is a textile. Methods for making the articles described herein are also provided.