Flexible Radiation-Shielding Sheet With Paper-Like Workability
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Solution Overview
Problem
Conventional radiation shielding materials, particularly those using lead, face issues with toxicity, handling difficulties, and inadequate folding performance and workability, which hinder their effectiveness in suppressing radiation exposure.
Innovation Solution
A radiation shielding paper sheet is developed using a combination of fibers and granular radiation shielding materials like tungsten, with specific particle size and composition, integrated through papermaking methods to enhance workability and handling properties while maintaining effective radiation shielding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead is used as radiation shielding material, then radiation shielding performance is improved, but handling properties and folding performance deteriorate
Solution Approach 1:
The patent uses composite materials by combining radiation shielding materials (such as barium sulfate, tungsten powder, or lead oxide) with papermaking fibers to create a paper sheet that integrates both shielding performance and flexibility. The radiation shielding material is dispersed within the fiber matrix, allowing the material to maintain structural integrity while being flexible enough for handling and folding.
Solution Approach 2:
The patent changes the physical form and distribution parameters of the radiation shielding material by controlling particle size (0.1-100 micrometers) and dispersion methods during papermaking. This transformation from bulk material to fine dispersed particles within a flexible matrix resolves the contradiction between shielding effectiveness and flexibility.
2Reliability
If lead plate is applied to solid object or human body, then radiation shielding performance is improved, but opening generation increases
Solution Approach 1:
The patent employs a flexible paper sheet structure that can conform to complex surfaces of solid objects or human bodies without generating openings. The thin film nature of the paper sheet allows it to wrap and adapt to contours while maintaining continuous radiation shielding coverage, unlike rigid lead plates that cannot flex.
Solution Approach 2:
The composite structure of radiation shielding particles embedded in a flexible paper matrix provides both the shielding performance of dense materials and the conformability of flexible materials, preventing opening generation when applied to irregular surfaces.
3Reliability
If lead is used in protective clothing, then radiation shielding performance is improved, but user movement is hindered
Solution Approach 1:
The patent creates a lightweight composite where radiation shielding particles are dispersed in a paper matrix, achieving shielding performance without the high density and weight of solid lead. This composite structure provides adequate shielding while maintaining flexibility and reducing weight for wearable applications.
Solution Approach 2:
By changing the concentration and particle size parameters of the radiation shielding material within the paper matrix, the patent optimizes the balance between shielding performance and weight, creating protective clothing that is both effective and wearable.
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 radiation shielding paper sheet exhibits excellent workability and handling properties, allowing for effective suppression of radiation exposure across various applications, with enhanced performance achieved through multi-layer lamination, comparable to lead-based solutions.
Implementation Method 1
a radiation shielding paper sheet having excellent folding performance and workability... to suppress radiation exposure to equipment, clothing, structures, moving bodies
Data Source
AI summary
A radiation shielding sheet of the present invention includes a fiber and a granular radiation shielding material, in which the fiber and the radiation shielding material are integrally formed into the shape of a sheet.