October 3-7—JOSHUA TREE, CALIFORNIA: Annual show; Sportsmans Club of Joshua Tree
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 Post subject: Portable EDXRF & Handheld LIBS for Gemological Purposes
PostPosted: Wed Mar 07, 2018 5:31 am 
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Joined: Sun Mar 10, 2013 4:13 am
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Hi Everyone ! It is question to advanced Users and Scientists from GO Forum . I would like to know Your opinion about Portable EDXRF & Handheld LIBS for Gemological Purposes to check chemistry of gemstones in the field or in the Lab . I have in mind EDXRFs (with SDD detectors) : P-Metrix by Xenemetrix http://www.xenemetrix.com/products/ed-xr-spectrometers/948-p-metrix.html and SPECROSCOUT by SPECTRO https://www.spectro.com/products/xrf-spectrometer/spectroscout-portable-xrf + Z300 Handheld LIBS by SCIAPS https://www.sciaps.com/xrf-handheld-x-ray-analyzers/x-300 or portable PortaLIBS by Stellarnet https://www.stellarnet.us/systems/stellarcase-libs-portable-instrument-for-elemental-analysis.There are many very sophisticated LIBS ( like Applied Photonics ) and XRF machines like ( Shimadzu & Thermo Scientific) which are very expensive but maybe portable & handheld ones are also could be very useful to check Chemistry .
Regarding EDXRF As We know Portable units has many Limitations ( but Bench Top expensive versions also ) and its all about Limit of Detection and Expensive Standardless Software ( or Standards for EDXRF).
Concerning LIBS same problem means Spectrometer Resolution + Collimating Camera for Laser triggering & hole size after laser ablation ( normally 100 microns per shot) + Argon or Helium Purge to increase resolution . Moreover Z300 is much smaller and really portable but for sure it has worse resolution but Is it critical here and not sufficient ? . PortaLIBS - Yo need at least 4 spectrometers to cover full range of chemical elements and it doesn't have camera & purge as an option & PortaLibs - Kigre laser causes much bigger hole in the stone after shot .

To the point . I would like to know Your opinion for above mentioned systems and which one could be the most useful for Gemological Purposes ( in the field and & in the Lab together)

Thank You !! All the Best
PolGem


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 Post subject: Re: Portable EDXRF & Handheld LIBS for Gemological Purpose
PostPosted: Thu Mar 08, 2018 1:49 am 
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Joined: Sat Oct 25, 2014 3:17 am
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Hi,
There is few articles about aplication of portable XRF in gemmology: for annalyzes of elements starting from Fe portable. XRF performs reasonably, usually light elements is out of scope. Those systems could be used, but price still in rang 20-25kEUR oposite 50 kEUR for entry level table top, Xenemetrix could be good choice, very similar concept to Spectro Scout. About LIBS - due to complex structure of emission spectra, pure resolution and demage by laser - I don't see any use for cut stones for portable LIBS.


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