Flexible Multilayer Radiation Shield for Spacecraft
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Solution Overview
Problem
Existing radiation shielding techniques for spacecraft are heavy and costly, failing to provide effective protection against particle radiation while maintaining a low mass and efficient installation in complex spaces.
Innovation Solution
A pliable multilayer blanket composed of alternating thin layers of materials with varying atomic numbers, including metals or metal alloys with Z ≥ 29, which can be manually formed and installed to provide equivalent radiation shielding to thicker aluminum panels with reduced mass and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional aluminum panels are used for radiation shielding, then radiation protection is provided, but mass and weight increase significantly
Solution Approach 1:
The patent employs a composite multilayer blanket structure combining materials with different atomic numbers (high-Z materials like tantalum or tungsten with low-Z materials like aluminum or polyethylene). This composite approach optimizes radiation shielding effectiveness by utilizing photoelectric absorption in high-Z layers and Compton scattering in low-Z layers, achieving superior protection per unit mass compared to conventional single-material aluminum panels
Solution Approach 2:
The shielding blanket is designed with spatially varying material composition and thickness, placing high-Z materials strategically in regions where radiation exposure is most intense. The non-uniform distribution of shielding materials optimizes the mass-effectiveness ratio by concentrating shielding capability where it is most needed rather than uniformly distributing mass throughout the spacecraft
2Object-affected harmful factors
If rigid aluminum shielding panels are used, then radiation protection is achieved, but installation in complex spaces becomes difficult
Solution Approach 1:
The patent replaces rigid aluminum panels with a flexible multilayer blanket that can be easily conforming to complex spacecraft geometries. The blanket structure, typically consisting of thin layers (each less than 20 mils thick) bonded together, can be draped and shaped to fit around irregular surfaces and in confined spaces where rigid panels cannot be installed
Solution Approach 2:
The shielding system is divided into multiple thin, flexible layers rather than a single thick rigid panel. Each layer can be independently manufactured and handled, then assembled into a composite structure that maintains flexibility while providing cumulative radiation protection. This segmented approach enables easier installation and integration into complex spacecraft configurations
3Object-affected harmful factors
If thicker aluminum panels are used for enhanced radiation shielding, then shielding effectiveness increases, but mass and cost increase
Solution Approach 1:
The patent uses composite multilayer construction with alternating high-Z and low-Z materials to achieve superior radiation attenuation per unit mass. The high-Z materials (tantalum, tungsten) provide strong photoelectric absorption for high-energy photons, while low-Z materials (aluminum, polyethylene) effectively scatter Compton electrons, creating a synergistic shielding effect that reduces the total material quantity needed compared to aluminum alone
Solution Approach 2:
The invention changes the material parameter (atomic number Z) to optimize shielding performance. By selecting materials with specific atomic numbers and arranging them in alternating layers, the system exploits the different interaction mechanisms of radiation with matter at different energy levels, achieving enhanced shielding effectiveness without proportionally increasing material quantity
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 multilayer blanket offers reduced mass and weight while maintaining or exceeding the radiation shielding effectiveness of thicker aluminum panels, with the ability to be manually shaped and fitted into complex spaces, and includes provisions for electrostatic discharge protection.
Implementation Method 1
a particle radiation shield may be formed from a pliable multilayer blanket including at least one layer composed of a metal or metal alloy having an atomic number (Z) of at least 29
Data Source
AI summary
A pliable multilayer blanket configured as a particle radiation shield, the blanket including multiple layers. A first layer of the multiple layers is composed of a first material and a second layer of the multiple layers is composed of a second material, different from the first material, each layer being less than 20 mils thick. At least one of the first material and the second material is a metal or metal alloy having an atomic number (Z) of at least 29.