Charles Ewing

8 Questions 16 Answers 0 Followers

Questions related from Charles Ewing

XRD: How would you predict the location of escape, pile-up, or multiple refraction lines in XRD output?

Considering ideal XRD output for Dolomite and Calcite, there is an XRD peak at approximately 2.93 degrees 2-theta to the left (low angle) of each primary line (peak) when the primary line is very...

09 March 2021 780 3 View

Is there a comprehensive list of Carboniferous period ash beds in North America?

I'm looking for a list (comprehensive would be great, but certainly not required) which shows known volcanic ashfall events in late Mississippian or early Pennsylvanian period of Eastern North...

20 November 2019 8,637 0 View

Astrometry: How do I make an estimated map of the mass in the galaxy, based from Earth, to any spherical coordinate, as though Earth did not rotate?

What I think I need to know is: 1) What is the current accepted shape of the Milky Way galaxy, and its sub-parts, such as core, halo, etc? Some documentation shows a sphere for dark halo, but...

31 August 2019 7,827 5 View

What open file format is preferred for raw ED-XRF data?

I have tens of thousands of individual scans in proprietary file formats, and I want to make these public. I need a format that is free and open, or to make my own. Our proprietary software...

18 January 2019 8,799 2 View

What is the cause of an enhanced XRF Rhodium peak?

When scanning Dolomite/Gypsum samples with the Bruker Tracer IV-SD, what element could cause very high enhancement in Rhodium, precisely at 2.70 keV? The clear center of our peak is at that value,...

26 September 2017 8,668 11 View

In XRF, using the Bruker Tracer IV-SD, found something at 7.71kev. If there is no Co in the sample, what is this rise?

The sample shows definite Mg, Sr, S, Cl, Rh (from the tool), Ar, K, Ca, Fe, and what appears to be Yb at 7.4kev. Scanning with no filter, Helium flushing, 15kV, 35microA. Raw photon counts seem...

14 May 2017 3,593 8 View

What is the best technique for removing surface chlorides from well cores before XRF scanning?

See project log for details so far. We're trying to reduce surface chlorides so that Rh indices can be easily inspected without adjacent interference. I've read some silly things, like using warm...

02 April 2017 4,959 2 View

Is there a method for getting powdered bismuth out of plastic sample trays?

While sampling various materials, I've ended up with a somewhat electroplated appearance in my plastic ED-XRF powder sample dish. When I don't have enough powder sample to scan, I get signatures...

01 January 1970 5,310 1 View