Composite Radiation Shield Using Polymer-Bound Hydrides
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Solution Overview
Problem
Current radiation shielding materials for spacecraft and spacesuits are inadequate in effectively reducing exposure to high-energy particles in space, as they either lack sufficient hydrogen content, stability, or structural integrity, leading to inefficient dose reduction and potential damage to electronics and biological tissues.
Innovation Solution
Development of high-hydrogen content materials, such as ammonia borane and lithium borohydride, combined with polymer binders to create composite radiation shields that absorb and dissipate energy from high-energy particles, with additional neutron-absorbing elements like boron, and a gas-impermeable barrier to prevent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-hydrogen content materials like ammonia borane and lithium borohydride are used, then radiation shielding effectiveness is improved, but material stability and structural integrity deteriorate
Solution Approach 1:
The patent combines high-hydrogen content materials (ammonia borane, lithium borohydride) with polymer binders to create composite shielding materials. The polymer binder provides structural stability and mechanical strength while the high-hydrogen content materials provide radiation shielding effectiveness, resolving the contradiction between shielding performance and material stability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the shielding material by incorporating specific ratios of high-hydrogen content materials and polymer binders. This parameter optimization allows achieving both high radiation shielding effectiveness and adequate material stability for space applications.
2Object-affected harmful factors
If high-hydrogen content materials are used, then radiation shielding effectiveness is improved, but structural strength deteriorates
Solution Approach 1:
The patent creates composite materials where polymer binders provide the structural strength framework while high-hydrogen content materials are distributed within this framework to provide radiation shielding. This composite structure resolves the contradiction between shielding effectiveness and structural strength.
Solution Approach 2:
The polymer binder acts as an intermediary material that provides structural strength and mechanical integrity while allowing the high-hydrogen content materials to maintain their radiation shielding function. The binder mediates between the structural requirements and the shielding requirements.
3Object-affected harmful factors
If neutron-absorbing elements like boron are added, then protection against secondary radiation is improved, but device complexity increases
Solution Approach 1:
The patent uses boron-containing compounds (ammonia borane, lithium borohydride) that serve multiple functions: they provide high hydrogen content for primary radiation shielding, contains neutron-absorbing boron for secondary radiation protection, and can function as the active shielding material itself. This multi-functionality reduces overall system complexity despite adding neutron protection capability.
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 composite radiation shields effectively reduce the dose of high-energy particles, provide structural strength, and prevent degradation, offering improved protection for both electronic components and biological tissues, while maintaining lightweight properties.
Implementation Method 1
nuclear collisions become a significant cause of radiation particle energy loss when the materials contain a large fraction of light elements such as hydrogen. Unlike heavier elements, the nucleus of the hydrogen atom cannot fragment and instead slows the incoming ions through inelastic collisions.
Implementation Method 2
a high hydrogen content shield material operates by absorbing or moderating the energy of the incoming particles
Implementation Method 3
There is a small additional benefit in using materials which also contain a neutron-absorbing element such as boron or lithium
Data Source
Figure 1a~1b
Figure 1c
Figure 2
AI summary
A spacecraft and spacesuit having a radiation shield are disclosed. The shield comprises a hydrogen-containing material encapsulated or bound in a polymer. The hydrogen-containing material has a higher hydrogen content than polyethylene. The hydrogen-containing material may be: encapsulated in a polymer container, sandwiched between layers of polymer, mixed with a polymer as binder, or held in the pores of a polymer foam. The hydrogen may be a hydride or borohydride such as beryllium borohydride, ammonium octahydrotriborate, lithium borohydride tetramethyl ammonium borohydride and beryllium hydride. Methods of manufacturing the shield are also disclosed.