Aligned Alpha-Gamma Spectrometry for In Situ Alpha Emitter Quantification
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Solution Overview
Problem
Current methods for characterizing nuclear wastes, such as gamma and neutron spectrometry, are inadequate for identifying and quantifying alpha emitters due to interference from other radionuclides and are sensitive to high-density matrices, while vacuum chamber alpha spectrometry is time-consuming and expensive, making it unsuitable for industrial applications.
Innovation Solution
A system comprising an alignment device for aligning an alpha detector and a gamma detector with a sample between them, using a material that allows gamma radiation to pass, enabling simultaneous alpha and gamma spectrometry measurements under ambient conditions, and a collimation grid to enhance energy resolution, allowing for in situ radiological characterization of alpha emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vacuum chamber alpha spectrometry is used to determine quantitative inventory of alpha-emitting radionuclides, then measurement precision is improved, but productivity is worsened due to time-consuming and expensive sample preparation
Solution Approach 1:
The invention changes the operating conditions from vacuum to ambient pressure, eliminating the need for vacuum chamber preparation. This parameter change allows direct measurement of alpha-emitting radionuclides without time-consuming sample preparation, thereby improving productivity while maintaining measurement precision through the use of appropriate detectors and analysis methods
Solution Approach 2:
The invention extracts the sample preparation step from the measurement process by using ambient pressure alpha spectrometry with collimation grids. This eliminates the need for vacuum chamber preparation and chemical separation, allowing direct measurement and significantly reducing preparation time and costs
2Ease of operation
If gamma spectrometry is used for characterisation of nuclear wastes, then ease of operation is improved, but measurement precision is worsened due to interference from other radionuclides and sensitivity to high-density matrices
Solution Approach 1:
The invention segments the measurement capabilities by combining gamma spectrometry (for easy non-destructive measurement) with alpha spectrometry under ambient conditions (for precise alpha emitter identification). This segmentation allows each technique to contribute its strengths: gamma for operational ease and alpha for measurement precision regarding alpha emitters
Solution Approach 2:
The invention merges gamma spectrometry and alpha spectrometry into a single integrated system. By combining these two measurement techniques, the system achieves both the operational ease of gamma spectrometry and the measurement precision for alpha emitters, resolving the contradiction between ease of operation and measurement precision
3Productivity
If atmospheric pressure alpha spectrometry is used without collimation, then productivity is improved by eliminating preparation steps, but measurement precision is worsened due to significant deterioration of alpha spectrum
Solution Approach 1:
The invention introduces a collimation grid as an intermediary element in the ambient pressure alpha spectrometry system. This collimation grid selectively transmits alpha particles while blocking others, thereby improving the quality of the alpha spectrum without requiring time-consuming sample preparation, thus maintaining both productivity and measurement precision
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 accurate, in situ, and cost-effective identification and quantification of alpha emitters in nuclear wastes without destructive sample preparation, facilitating real-time radiological characterization and reducing measurement time and costs.
Implementation Method 1
at least one portion of which, delimited by the upper and lower faces and including the alignment axis, is made of a material able to let the gamma radiations pass
Implementation Method 2
an alpha detector (3), equipped with a collimation grid, able to provide alpha spectrometry measurements
Implementation Method 3
a gamma detector (4) able to provide gamma spectrometry measurements
Implementation Method 4
an alpha detector (3), equipped with a collimation grid, able to provide alpha spectrometry measurements
Data Source
AI summary
A system is provided for correlating gamma spectrometry measurements and alpha spectrometry measurements of a same sample comprising radionuclides. The system includes at least a gamma detector able to provide gamma spectrometry measurements; an alpha detector able to provide alpha spectrometry measurements, equipped with a collimation grid; and means for acquiring and analysing alpha spectrometry and gamma spectrometry measurements.