Multi-Material X-Ray Tube Anodes for Simultaneous Toxin Detection
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Solution Overview
Problem
Current methods for toxic element analysis in consumer products are either inaccurate, destructive, or not suitable for factory-floor use, failing to meet the need for rapid, reliable, nondestructive, high-sensitivity, and cost-effective measurements required by stringent regulations, especially for detecting multiple toxins in heterogeneous samples.
Innovation Solution
The development of improved x-ray analysis systems utilizing multiple monochromatic x-ray excitation techniques and systems that include a target with tailored materials for emitting specific energy profiles, combined with advanced x-ray optics for precise energy focusing and monochromatization, allowing for simultaneous measurement of multiple toxins in paint layers and substrates, and enabling efficient elemental analysis in various industries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handheld XRF guns are used for toxin detection, then the method is rapid and nondestructive, but the sensitivity is insufficient and cannot detect toxins at regulated concentration levels
Solution Approach 1:
The patent combines multiple target materials (e.g., Rh, W, Pt, Ir, Au) with multiple x-ray optics into a single integrated system. This merging allows the system to provide multiple excitation energy bands simultaneously, achieving both high sensitivity for trace toxin detection and rapid measurement capability. The combined system overcomes the sensitivity limitation of conventional handheld XRF guns while maintaining speed.
Solution Approach 2:
The x-ray analysis system is designed with multi-functionality to detect multiple elements across different concentration ranges simultaneously. By incorporating multiple target materials that emit different energy bands and using multiple optics for different detection angles, the system can analyze both trace toxins and bulk materials in a single measurement, achieving universal applicability for regulatory compliance testing.
2Measurement precision
If ICP-OES is used for accurate toxin analysis, then the measurement accuracy is sufficient, but the method is destructive, expensive, and time-consuming
Solution Approach 1:
The patent employs self-service principles by using the sample itself as the analysis target without requiring destructive preprocessing. The x-ray system directly analyzes the sample in its original state, eliminating the need for acid digestion, combustion, or other destructive steps required by ICP-OES. This achieves both high accuracy and rapid, nondestructive testing.
3Adaptability or versatility
If a single x-ray target material is used, then the system is simple, but it cannot simultaneously excite multiple elements with different energy requirements
Solution Approach 1:
The patent uses composite target materials consisting of multiple elements (e.g., Rh-W, W-Pt, Pt-Ir, Ir-Au) with different atomic numbers and x-ray emission energies. These composite targets are designed to emit multiple excitation energy bands that can simultaneously excite different elements in the sample. The composite structure enables multi-element detection while maintaining a relatively simple single-target configuration.
4Measurement precision
If polychromatic x-ray beams are used for excitation, then the system is simple to operate, but the signal-to-background ratio is poor and measurement quality is reduced
Solution Approach 1:
The patent segments the x-ray beam path by introducing multiple optics (mirrors, monochromators, or crystal diffraction elements) that separate and select specific energy bands from the polychromatic x-ray emission. Each optic is configured to transmit only the energy range optimal for exciting particular elements, thereby eliminating background radiation and improving the signal-to-background ratio while maintaining operational simplicity through automated control.
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
These systems provide fast, accurate, and cost-effective quantification of toxins at low regulatory levels, enabling in-the-factory and in-the-field measurements, effectively addressing the challenges of heterogeneous samples and regulatory compliance.
Implementation Method 1
A first target material may be tailored to emit a first energy profile and a second target material may be tailored to emit a second energy profile upon impingement by electrons
Implementation Method 2
each target material tailored to emit a respective energy profile upon impingement by the electrons
Implementation Method 3
a first x-ray optic may be provided for receiving the diverging x-ray beam and directing the beam toward the sample spot, the first x-ray optic monochromating the diverging x-ray beam to a first energy from the energy emitted by the first target material
Implementation Method 4
Fluorescence from the sample spot induced by the first and second monochromated energies may be used to measure the concentration of at least one element in the sample
Data Source
AI summary
An x-ray tube includes a target on which electrons impinge to form a diverging x-ray beam. The target has a surface formed from first and second target materials, each tailored to emit a respective x-ray energy profile. A first x-ray optic may be provided for directing the beam toward the sample spot, the first x-ray optic monochromating the diverging x-ray beam to a first energy from the energy emitted by the first target material; and a second x-ray optic may be provided, for directing the beam toward the sample spot, the second x-ray optic monochromating the diverging x-ray beam to a second energy from the energy emitted by the second target material. Fluorescence from the sample spot induced by the first and second monochromated energies is used to measure the concentration of at least one element in the sample, or separately measure elements in a coating and underlying substrate.