Handheld XRF Analyzer Magnet Electron Deflection
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Solution Overview
Problem
Portable X-ray fluorescence spectrometers face challenges due to the long mean free path length of electrons, such as photoelectrons and auger-electrons, which can reach the detector, leading to increased background noise and higher limits of detection.
Innovation Solution
A handheld XRF analyzer is designed with a radiation source assembly, a radiation detector assembly, a purge assembly, a magnet to deflect electrons, and a processor to determine sample properties from detected XRF radiation. The magnet is strategically placed outside the X-ray beam and XRF radiation paths to prevent electrons from reaching the detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas purging and light-tight windows are used to improve detection sensitivity for light elements, then the background noise increases due to electrons reaching the detector, but the limits of detection worsen
Solution Approach 1:
The harmful electrons (photoelectrons and Auger electrons) that cause background noise are selectively removed from the detection path by deflecting them away from the detector, while allowing the desired X-ray fluorescence photons to reach the detector unimpeded
Solution Approach 2:
A magnetic field is introduced as an intermediary force between the electrons and the detector to deflect the electrons away from the detector path, preventing them from causing background noise while not affecting the X-ray photons
2Ease of operation
If the mean free path length of electrons is long in portable XRF spectrometers, then electrons can reach the detector causing increased background, but this is not a problem in standing instruments where electrons are absorbed beforehand
Solution Approach 1:
The long mean free path of electrons, which is a disadvantage in portable instruments, is converted into a benefit by using the magnetic field to control and direct these electrons away from the detector, transforming the potential harm into a manageable characteristic specific to portable design
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 solution effectively reduces background noise in the X-ray spectrum by deflecting electrons with the magnet, resulting in improved detection limits and more accurate elemental analysis.
Implementation Method 1
a magnet configured to deflect electrons such that they do not reach the radiation detector assembly
Implementation Method 2
a radiation source assembly configured to irradiate a sample to be tested with an X-ray beam
Implementation Method 3
In response to the incident beam the target emits element specific fluorescence radiation
Data Source
Figure 1a~2a
Figure 2b~2d
Figure 3
AI summary
The present disclosure refers to a handheld X-ray fluorescence, XRF, analyzer (1). The XRF analyzer (1) comprises a radiation source assembly (10) configured to irradiate a sample (40) to be tested with an X-ray beam (105), a radiation detector assembly (20) configured to detect a first X-Ray fluorescence, XRF, radiation (205) emitted from the sample (40) in response to the X-ray beam (105), a purge assembly configured for purging through a port connection, a magnet (30) configured to deflect electrons such that they do not reach the radiation detector assembly (20) and a processor configured to determine a property of the sample (40) to be tested from the first X-ray fluorescence, XRF, radiation (205). The present disclosure further refers to a method for elemental analysis with a handheld XRF analyzer (1).