Self-Powered Gamma Detector Enclosure for Isotope Activity Measurement

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Solution Overview

Problem

Accurate and efficient measurement of gamma radiation emitted by radioactive isotopes like Co-60 is necessary to ensure compliance with activity limits and commercial requirements, but existing methods are labor-intensive and lack precision.

Innovation Solution

A measuring device comprising an inner and outer enclosure with a gamma-radiation sensitive self-power detector (SPD) secured around the inner enclosure, allowing for precise measurement of electrical current induced by the isotope to determine activity levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional radiation detectors (Geiger-Müller counters, scintillation detectors) are used, then radiation detection capability is achieved, but device complexity and cost increase due to high voltage power supplies and cooling systems

Engineering Contradiction:

Improveradiation detection capabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The detector material itself serves as the sensor that generates electrical signals from radiation interactions, eliminating the need for external high voltage power supplies and complex cooling systems. The material's intrinsic properties enable it to detect radiation and produce measurable electrical responses without additional supporting infrastructure.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces complex mechanical and electrical systems (high voltage power supplies, photomultiplier tubes, cooling mechanisms) with a solid-state detector material that directly converts radiation energy into electrical signals through electronic processes, simplifying the overall system architecture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If conventional radiation detectors are used, then radiation detection is possible, but portability is reduced due to size and weight of associated electronics

Engineering Contradiction:

Improveradiation detection capabilityVSAvoiddevice weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The detector material autonomously performs both detection and signal generation functions, eliminating heavy external electronics, power supplies, and cooling systems that would increase device weight. The material's self-sufficient operation enables portable deployment.

Inventive Principle:

Principle #25Self-service

3Device complexity

If self-powered detectors are used, then device complexity is reduced, but measurement precision may be affected by lack of active cooling

Engineering Contradiction:

Improvedevice complexityVSAvoidmeasurement precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces active cooling systems with passive thermal management through the detector material's inherent thermal properties. The solid-state material dissipates heat through conduction and radiation without requiring mechanical cooling apparatus, maintaining operational stability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The detector material's electrical and thermal parameters are optimized to maintain measurement precision at operating temperatures without active cooling. The material's intrinsic properties are selected or engineered to ensure stable signal generation across the expected temperature range.

Inventive Principle:

Principle #35Parameter changes

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

Enables quick and accurate determination of radioactive isotope activity by maintaining SPD position consistency, reducing uncertainty and labor costs, and ensuring compliance with regulatory and commercial standards.

Implementation Method 1

a self-power detector material, which generates an electrical charge in response to detecting a nuclear isotope

Methodology Applied

Scientific EffectCharge generation:

Implementation Method 2

the detector material has a band gap that allows for electron-hole pair formation

Methodology Applied

Scientific EffectElectron-hole pair formation:

Implementation Method 3

the detector material has charge carrier migration properties that allow the charge to move through the material

Methodology Applied

Scientific EffectCharge carrier migration:

Data Source

PatentEP4127779B1Device for measuring the activity of nuclear isotopes using a self-power detector

Publication Date: 2026.04.29 WESTINGHOUSE ELECTRIC CORP

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Figure 3

AI summary

A measuring device for measuring the activity of a specimen of a radioactive isotope is disclosed. The specimen of the radioactive isotope is contained within a capsule. The measuring device comprises an inner enclosure, a gamma-radiation sensitive self-power detector (SPD) positioned around the inner enclosure, and an outer enclosure positioned around the SPD and the inner enclosure. The inner enclosure comprises an internal cavity configured to receive the capsule containing the specimen. The inner enclosure defines a longitudinal axis. The outer enclosure secures the SPD to the inner enclosure such that the SPD does not move during operation and storage of the measuring device.