Nuclear Battery Insulator Layer for Lower Bremsstrahlung Emission

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Solution Overview

Problem

Existing Radioisotope Thermal Generators (RTGs) face challenges with Plutonium-238 due to the need for large radiation shielding and difficulty in increasing power density, as beta-emitting compositions produce undesirable Bremsstrahlung radiation and require significant shielding.

Innovation Solution

A nuclear battery that generates electrical energy directly from beta radiation emissions using a radiation source layer, a first electrical insulator layer, and a first casing layer with specific materials to reduce Bremsstrahlung radiation, allowing for a controlled slow-down of beta radiation without the need for large shielding layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If beta-emitting compositions are used to generate electrical energy, then power density is increased, but Bremsstrahlung radiation is produced requiring significant shielding

Engineering Contradiction:

Improvepower densityVSAvoidBremsstrahlung radiation

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

An electrical insulator layer is introduced as an intermediary between the beta radiation source and the casing. This layer slows down beta particles before they reach the casing, reducing Bremsstrahlung radiation production while still allowing electrical energy generation through the beta particles' interaction with the electric field between electrodes.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the potentially harmful Bremsstrahlung radiation into a beneficial outcome by using the electrical insulator layer to control beta particle deceleration. The controlled slow-down process generates useful electrical energy through the beta-voltaic effect while minimizing harmful radiation emissions, effectively turning a harmful byproduct into a useful energy source.

Inventive Principle:

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

2Object-affected harmful factors

If large radiation shielding is used to protect against Bremsstrahlung radiation, then radiation protection is improved, but device weight and size increase

Engineering Contradiction:

Improveradiation protectionVSAvoidshielding weight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of moving object

Solution Approach 1:

The electrical insulator layer serves as a mediator that reduces Bremsstrahlung radiation at its source by controlling beta particle deceleration. This eliminates the need for large, heavy shielding layers, as the radiation is minimized before it can require extensive protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the physical parameters of beta particle interaction by introducing the electrical insulator layer with specific thickness and material properties. This modifies the deceleration profile of beta particles, reducing Bremsstrahlung radiation production and thereby reducing the shielding requirements in terms of both weight and size.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If Plutonium-238 is used in RTGs, then reliable heat generation is achieved, but radiation shielding requirements increase

Engineering Contradiction:

Improveheat generation reliabilityVSAvoidradiation shielding needs

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the thermal conversion mechanism (heat generation through alpha decay) with a direct electrical energy generation mechanism (beta-voltaic effect). This substitution eliminates the need for thermocouples and reduces radiation shielding requirements since beta particles produce minimal Bremsstrahlung radiation when properly managed through the electrical insulator layer.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental operating parameters by switching from alpha decay (Plutonium-238) to beta decay isotopes. This parameter change fundamentally alters the radiation profile and energy conversion mechanism, reducing shielding needs while maintaining reliable power generation through the beta-voltaic effect.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250378971A1Nuclear power source, nuclear battery assembly, and a method of manufacture thereof

Publication Date: 2025.12.11 WESTINGHOUSE ELECTRIC CORP

AI summary

The present disclosure provides a nuclear power source, a nuclear battery assembly, and a method of manufacture thereof. The nuclear power source comprising a radiation source layer, a first electrical insulator layer disposed over the radiation source layer, a first casing layer disposed over the first electrical insulator layer, a first electrode in contact with the radiation source layer, and a second electrode in contact with the first casing layer. The radiation source layer comprises a composition configurable to emit beta radiation. A voltage potential is present between the first electrode and the second electrode when the radiation source layer emits beta radiation. The first electrical insulator layer has a thickness that reduces an average energy of the beta-radiation from the radiation source layer that contacts the first casing layer such that Bremsstrahlung radiation emitted when the beta-radiation reaches the first casing layer is reduced.