Beta Radiation Nuclear Battery Direct Energy Conversion

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Solution Overview

Problem

Radioisotope Thermal Generators (RTGs) face challenges with the use of Plutonium-238, including high radiation shielding requirements due to gamma radiation emissions from beta radiation deceleration, and limited power density, as they typically only generate energy from thermal energy produced by alpha radiation deceleration.

Innovation Solution

A nuclear battery design that utilizes a radiation source layer emitting beta radiation, with a casing layer to inhibit beta radiation traversal and generate electrical energy directly from beta radiation emissions, reducing shielding needs and increasing power density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If Plutonium-238 is used in RTGs to generate thermal energy from alpha radiation deceleration, then power generation is achieved, but gamma radiation shielding requirements increase

Engineering Contradiction:

Improvepower generationVSAvoidgamma radiation shielding requirements

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes the harmful gamma radiation component from the system by using beta radiation sources instead of alpha radiation sources. Beta radiation decelerates without producing significant gamma radiation, thereby eliminating the need for extensive gamma shielding while maintaining power generation capability through direct beta particle collection.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the radiation type parameter from alpha radiation (Plutonium-238) to beta radiation (such as Strontium-90, Yttrium-90, or Promethium-147). This parameter change fundamentally alters the radiation interaction characteristics, allowing direct electrical energy generation from beta particles while minimizing gamma radiation production and shielding requirements.

Inventive Principle:

Principle #35Parameter changes

2Power

If RTGs convert thermal energy to electricity using thermocouples, then power generation is achieved, but power density is limited

Engineering Contradiction:

Improvepower generationVSAvoidpower density

Core Design Contradiction:

PowerVSProductivity

Solution Approach 1:

The patent replaces the thermal-to-electrical conversion mechanism (thermocouples) with a direct particle-to-electrical conversion system. Beta particles directly interact with collector electrodes to generate electrical current, eliminating the intermediate thermal conversion step and significantly increasing power density by directly harvesting kinetic energy from beta radiation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary electrically conductive material layer between the beta radiation source and the collector electrode. This intermediary layer facilitates direct electron collection from beta particles while maintaining electrical isolation from the radiation source, enabling efficient direct energy conversion and enhancing power density compared to thermal conversion methods.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If extensive radiation shielding is used to protect against gamma radiation, then radiation protection is improved, but device complexity and size increase

Engineering Contradiction:

Improveradiation protectionVSAvoidshielding structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent converts the harmful gamma radiation problem into a benefit by selecting beta radiation sources that inherently produce minimal gamma radiation. The beta particles themselves become the useful resource for direct electrical energy generation, while their deceleration produces negligible harmful radiation, effectively turning a potential harm into a beneficial low-shielding requirement system.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 nuclear battery achieves direct electrical energy generation from beta radiation, reduces radiation shielding requirements, and enhances power density, enabling efficient and compact energy production for various applications, including military and civil uses.

Implementation Method 1

The radiation source layer comprises a composition configurable to emit beta radiation

Methodology Applied

Scientific EffectBeta radiation emission: Radioactive Decay

Implementation Method 2

The casing layer comprises a composition configured to inhibit traversal of beta radiation

Methodology Applied

Scientific EffectBeta radiation absorption: Absorption (EM radiation)

Data Source

PatentUS12198826B2Nuclear battery

Publication Date: 2025.01.14 WESTINGHOUSE ELECTRIC CORP

AI summary

A nuclear battery is provided. The nuclear battery comprises a radiation source layer, a first electrical insulator layer, a casing layer, a first electrode, and a second electrode. The radiation source layer comprises a composition configurable to emit beta radiation. The first electrical insulator layer is disposed over the radiation source layer. The casing layer is disposed over the first electrical insulator layer. The casing layer comprises a composition configured to inhibit traversal of beta radiation. The first electrode is in electrical communication with the radiation source layer. The second electrode is in electrical communication with the casing layer. A voltage potential is present between the first electrode and the second electrode when the radiation source layer emits beta radiation.