![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Sigray-Attomap-Applications-Gemstones-1.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Sigray-Attomap-Applications-Gemstones-1.png)
Overview of the Demo
Samples:
Probe Mount Disc#5
Set Up:
- Moly Target of Multi-target x-ray source with optics optimised for Molybdenum K-alpha edge(17.4KeV)
- Performed in air, non-vacuum system
- X-ray beam is 90 degree to the sample surface in flat geometry
Desired Outcomes:
Major element percentage & trace element detection
XRF Heatmap from Various Channels
20um step size/ 0.5 seconds dwell time
Tri-Colour Composite
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Gemstones.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Gemstones.png)
20um step size/ 0.5 seconds dwell time
Investigation of low Z elements to distinguish them as sapphires
Gradients of trace elements to understand viability of a location for diamonds
Each gemstone, taken from a different location, can indicate proximity to diamonds
Image Processing and Data Analysis
Auto-Segmentation
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Tri-Colour-Composites-1024x594.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Tri-Colour-Composites-1024x594.jpg)
Integral spectra from particle#23 with BG subtraction and peak fitting (~190 sec statistic)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Integral-spectra-from-particle23-with-BG-subtraction-and-peak-fitting--1024x436.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Integral-spectra-from-particle23-with-BG-subtraction-and-peak-fitting--1024x436.jpg)
Sort through all particles to get Y-Ka counts distribution
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/get-y-ka-counts.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/get-y-ka-counts.jpg)
Spectra from 300-second point analysis on particle #23 ( with better statistics)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Tri-Colour-Spectra-1024x507.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Tri-Colour-Spectra-1024x507.jpg)
Net counts of each element after peak fitting and background subtraction from particle#23
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/net-counts-table-1024x184.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/net-counts-table-1024x184.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Net-counts-of-each-element.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Net-counts-of-each-element.png)
Spectra from 300-second point analysis on particle #14
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Spetra-from-300-second-1024x441.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Spetra-from-300-second-1024x441.jpg)
Net counts of each element after peak fitting and background subtraction from particle#14
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Particle-14-table-1024x191.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Particle-14-table-1024x191.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Particle-14.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Particle-14.png)
Spectra from 300-second point analysis on particle #21
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Particle-21-1024x450.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/Particle-21-1024x450.jpg)
Net counts of each element after peak fitting and background subtraction from particle#21
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/particle-21-table-1024x190.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/particle-21-table-1024x190.jpg)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/particle-21-pie.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/particle-21-pie.png)
LLD Calculation on NIST Standard#610
300-second point analysis
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/300-second-point-analysis-1024x445.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/300-second-point-analysis-1024x445.png)
Relative Low Limit Detection(LLD) Normalized to 35% of Si in NIST#610 with 300 seconds data collection time
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/LLD-35-of-Si-in-NIST610.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/LLD-35-of-Si-in-NIST610.png)
LLD Calculation on NIST Standard#613
300-second point analysis
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/LLD-35-of-Si-in-NIST613-1024x446.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/LLD-35-of-Si-in-NIST613-1024x446.png)
Relative Low Limit Detection(LLD) Normalised to 35% of Si in NIST#613 with 300 seconds data collection time
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/613-LLD.png)
![](https://qd-uki.co.uk/wp-content/uploads/2020/01/613-LLD.png)
Conclusion
- We successfully mapped all the particles in Disc #5, and auto-segmented each particle
- Quantification can be done on each particle on major elements, which are shown in particle #23, particle #14 and particle #21
- Trace level Y is found in particle #23 and particle #14, but not particle #21
- Relative LLD is calculated with data from NIST Standard 610, plot is shown.