Rock art - An innovative method of XRF signal isolation in bi-layered systems for characterizing red rock art [html, pdf 14pp] #RockArt #pictographs #ParietalArt #XRF https://www.sciencedirect.com/science/article/pii/S2352409X25003153?via%3Dihub

XRF Scientific ( #XRF ) has released " March 2025 Quarterly Trading Report " on Tue 15 Apr at 09:13 AEST #tax #trading #Mining #UnitedStates #Australia
https://grafa.com/asset/xrf-scientific-ltd-10919-xrf.asx?utm_source=asxmktsensitive&utm_medium=mastodon&utm_campaign=xrf.asx

#Sulphur variations in annually #layered #stalagmites using benchtop micro #XRF

#xray #fluorescence is a great tool for #geochemistry and #paleoclimate studies!

#science #spectra #traceelements

https://www.sciencedirect.com/science/article/abs/pii/S0584854722000106

This week in the student's practical course:

**X-Ray Fluorescence Analysis**

One task was to analyze historical Roman coins and evaluate if they are genuine or not.

Spot the counterfeit... 😀

#XRF #AnalyticalChemistry #university #teaching #PracticalCourse #XRayFluorescence

☕ Here's a bit of technical content from me - today a deep dive on #baseline correction methods.

📈 Baseline correction is a preprocessing technique to remove background signal and isolate peaks in hashtag#spectroscopy data.

📝 In my recent post I discuss two methods:
1. Wavelet transform (WT) - Decomposes signal into components at different frequencies. Lowest frequency component represents baseline and can be removed.
2. Asymmetric least squares (ALS) - Fits a smooth baseline function, penalising positive deviations more than negative ones.

TL;DR: WT method is intuitive but can distort peaks. ALS produces better results.

🔎 Both methods are applied on a #Raman spectrum and an X-ray fluorescence (#XRF) spectrum. ALS gives a cleaner baseline correction and it's effective for removing broad, slowly varying background while preserving sharper spectral features.

#chemometrics #Python #MachineLearning #wavelets #regression

https://nirpyresearch.com/two-methods-baseline-correction-spectral-data/

New #research: Can we trace development stages and ecology of a #permafrost thaw lake throughout the Holocene? Using an innovative combination of sedimentary proxies (ancient #DNA, #diatoms, #XRF), @Iza_bai et al. show: Yes, we can!

Long-term evolution of Central #Yakutia's vital #alaas #thermokarst lakes is traced throughout past millennia. This may help understand future pathways of culturally important lake systems!

#sakha #siberia #alas #newresearch #aDNA #eDNA

https://doi.org/10.1007/s10933-023-00285-w

Dank Röntgenfluoreszenz (#XRF) kann durch eine spektrale Messung die elementare Aufbau von Materie analysiert werden.
Ähnlich zur optischen #Fluoreszenz wird ein #Atom angeregt: Ein #Photon mit Energie oberhalb einer Absorptionsschale kann vom Atom absorbiert werden, woraufhin ein #Elektron die Hülle verlässt (Ionisation), oder auf eine energetisch höhere Bahn gebracht wird.

Just out: our latest work reveals environmental changes in southern Patagonia. A fine multi-proxy study led by @NehmeCarole gives you everything: #stableisotopes #clumped #isotopes #fluidinclusions #XRF and more. Proud to be part of such nice team! 😍 https://www.sciencedirect.com/science/article/pii/S0921818123000231?dgcid=author

A #research team at the #University of Göttingen [#Physics #Optics] has developed a new method to produce #Xray images in #colour. In the past, the only way to spatially determine the #chemical #composition of a sample using X-ray #fluorescence [#XRF] was to focus X-rays and scan the whole sample. This is time-consuming and expensive. Scientists have now developed an approach that allows an image of a large area to be produced from a single exposure.

published in Optica: https://doi.org/10.1364/OPTICA.477809

Ein Forschungsteam [#Forschung #Physik #Optik] der #Universität #Göttingen hat ein neues Verfahren für Röntgenfarbaufnahmen [#Röntgen #Xray #Xrays] entwickelt. Um nicht nur die chemischen #Elemente einer Probe durch Röntgenfluoreszenzanalyse [#Fluoreszenz #XRF] zu bestimmen, sondern auch deren räumliche Verteilung, muss bislang die genutzte #Röntgenstrahlung fokussiert und die Probe aufwendig abgerastert werden.

PM: https://uni-goettingen.de/de/3240.html?id=6960

Publikation @ Optica: https://doi.org/10.1364/OPTICA.477809