quirkzunc
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XRF
Does anyone know where I can get some good fundamental knowledge of the principles of XRF measurement?
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not_important
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Might start here, see how that matches what you are looking for
http://www.jobinyvon.com/SiteResources/Data/Templates/1custo...
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JohnWW
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Simply look up "X-ray fluorescence" (in double quotation marks) on Google! That gives 651,000 results to choose from, including:
http://en.wikipedia.org/wiki/X-ray_fluorescence
http://www.amptek.com/xrf.html
http://www.britannica.com/EBchecked/topic/650457/X-ray-fluor...
http://www.mineralogie.uni-wuerzburg.de/links/tools/xrf.html
Selecting only PDF and DJVU documents by adding: filetype DF OR filetype JVU
reduces the number to 61,000, including:
http://www.amptek.com/pdf/xrf.pdf
http://www.lanl.gov/environment/all/docs/qa/ep_qa/EP-ERSS-SO...
http://www.up.ac.za/academic/geol/XRF_XRD.pdf
http://www.uoi.gr/services/lab-net/net-web/XRF_en.pdf
http://www.icdd.com/resources/axa/VOL44/v44_049.pdf
http://www.iupac.org/goldbook/W06662.pdf
http://www.ias.ac.in/currsci/sep102008/603.pdf
http://www.nsls.bnl.gov/newsroom/events/workshops/2008/lsdp/...
http://www.fas.org/sgp/othergov/doe/lanl/lib-www/la-pubs/003...
Rapidshare or other downloads of textbooks or handbooks on the subject are at:
http://allfreedownloadlinks.com/free-ebooks-downloads/free-m...
http://emuch.net/html/200701/400013.html (Handbook Of Spectroscopy)
http://azut.blogfa.com/cat-2.aspx
http://www.pdf-search-engine.com/x-ray-pdf.html
http://www.pdf-search-engine.com/x-ray-capillary-optics-pdf....
A BitTorrent download of relevant books is at:
http://www.btmon.com/Other/E-books/Spectroscopy_Great_Collec...
or https://torrentbox.com/torrent_details?id=198970&filelis...
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neptunium
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i know i am way late (as usual) and its been done before but i thought it was relevant ...
https://www.youtube.com/watch?v=5rTwOXVBOko
[Edited on 24-5-2018 by neptunium]
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Ozone
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There are also a number of useful phone apps (energy tables, etc.). You might want to check out Cody on YouTube; he's recently acquired a handheld and
demonstrates it with a variety of interesting samples--with the usual explanations as he goes. e.g. https://www.youtube.com/watch?v=1eN40-olHM8
See also (including a DIY rig that seems to work): https://www.youtube.com/results?search_query=DIY+XRF
O3
-Anyone who never made a mistake never tried anything new.
--Albert Einstein
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neptunium
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Yes Cody's lab is one of my favorite home science guy!! But he has a lot more time and financial freedom !
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stamasd
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There's information on building and using your own setup on the forums at http://www.gammaspectacular.com/phpBB3/index.php
The board admin himself has built one to analyze precious metal alloys. There are a few other very knowledgeable people there.
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neptunium
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https://www.youtube.com/watch?v=c4CusOi4cCM&t=1s
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neptunium
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https://youtu.be/eCKZ_jCkS78
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neptunium
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https://youtu.be/eCKZ_jCkS78
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Cezium
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neptunium> what is the source of xrays that you used?
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neptunium
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It's a Phillips rotating anode I found on eBay years ago.. it's powered by a 24VAC transformer for the anode ,a regulated DC power supply for the
filament and a Glassman high voltage DC. It's a rather large tube incased in a thick aluminum housing.
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Cezium
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I salvaged two decommissioned NaI(Tl) probes from my work and a driver planing to build XRF. As a Xray source I got twelve 241Am sources from smoke
detectors each around 10kBq or tube from mammograph an CT HV source as an alternative. But the probes driver is an old one with serial port and
proprietary software that I dont have. I want to try use its HV part and combine it to SoundCard input with free SW, but something like this http://www.gammaspectacular.com/phpBB3/viewtopic.php?f=15&am... would be nice 
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neptunium
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The more concentrated the x ray beam is, the more accurate the detection will be and the more power you`ll put in your xrays, the quicker the spectrum
will be ready for review. 10 source of Am241 will certainly work but you`ll be surprised how long it takes. I tried..
The problem with NaI(Tl) is the resolution at low energy. I dont usually look too far below about 100Kev with the NaI detector.It works great for
higher energy like Co60 and K40 though.
The Xray detector is the opposite its terrible at picking up any high energy but is doing a great job with good resolution untill around 10Kev. lower
than that and the peaks are bunched up together and it become difficult to say for sure if i am looking at Iron (6.40Kev) or Cr (5.41Kev).
If it does not introduce too much noise, some electronics (bias, pulse shaping etc) might be of some help.. After all isnt it what home science is all
about ?
[Edited on 6-6-2018 by neptunium]
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stamasd
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When I clear my backlog of other projects (I have about 10 or 12 ongoing at this time) I plan on trying some XRF experiments. For low energy
gammas/Xrays an alternative detector can be a PIN diode, or array thereof. There are some large PIN photodiodes that can be had cheaply (BPW34 and
others) which can play this role if shielded from light. They have a low active volume thus not much stopping power for higher energy gammas (above
100keV) but can give decent energy resolution below that.
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neptunium
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i am not sufficiently knowledgeable about electronic to be able to make this work ..but if you can, i`ll be curious to see the result! absolutely!
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stamasd
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Here are some examples:
A practical circuit ( a little unconventional): http://atom.univ.kiev.ua/2016/prof/yerm/prog_logic/presentat...
Maxim application note: https://www.maximintegrated.com/en/app-notes/index.mvp/id/22... This functions only as a pulse counter.
Another practical circuit (also only counts pulses i.e. Geiger mode) : http://www.rhelectronics.net/store/gamma-photon-nuclear-radi...
A practical build for gamma spectroscopy: http://physicsopenlab.org/2017/06/22/x-ray-spectroscopy-with...
A simple but IMHO inaccurate circuit: http://www.dexus5.com/system3/geiger-counter-gamma-spectrum-...
A paper including practical circuit and comparison with a high performance detector: https://cyberleninka.ru/article/n/pin-photodiodes-for-gamma-...
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neptunium
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Very cool! this gives me all kinds of ideas!! thanks for sharing that!
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Texium
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