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Re: Xrf timing belt
Good scan Taray, Thanks for showing. Geo From: "taray singh via groups.io" <sukhjez@...> To: [email protected] Sent: Thursday, January 28, 2021 9:09:49 AM Subject: Re: [XRF] Xrf timing belt Hi guys Automotive xrf continues? Here is an xrf of??my used car spark plug The elements detected are as follows? Main body Fe Likely to have an Aluminum oxide ceramic?? Electrode side? Ni as a super alloy electrode? Zn chromate shell plating??providing the color. Other elements which may be??present??at the electrode end but??not detected due to trace amounts or spectral overlay are silver, gold??or platinum? Pics are??for spark plug,Mca and corresponding pic Thanks? Taray On Monday, December 7, 2020, 12:44 PM, Dude <dfemer@...> wrote:
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Re: Xrf timing belt
taray singh
Hi guys Automotive xrf continues? Here is an xrf of??my used car spark plug The elements detected are as follows? Main body Fe Likely to have an Aluminum oxide ceramic?? Electrode side? Ni as a super alloy electrode? Zn chromate shell plating??providing the color. Other elements which may be??present??at the electrode end but??not detected due to trace amounts or spectral overlay are silver, gold??or platinum? Pics are??for spark plug,Mca and corresponding pic Thanks? Taray On Monday, December 7, 2020, 12:44 PM, Dude <dfemer@...> wrote:
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Re: Supplements exposed :filling materials of pharmaceuticals
taray singh
Hi guys
Pharmaceuticals have some active ingredients but their main components? are fillers. These? fillers have some functions which? are not? necessarily therapeutic but can influence the tolerance to a drug. But they can be? ?used for identification of manipulated products? such as presence? of inorganic compounds? especially in some generics. As a reference I have provided a micro xrf lab results of a sample of Aspirin Baeyer original and a generic. The generic filler has more inorganic compounds? compared to the original Pb is astonishingly present in the generic Unfortunately Pb residual peaks makes it difficult to make an? analysis regarding the presence of lead with Am setup Here I am using generic form of clopidogrel a common antiplatelet medication? better? known as Plavix My sample is a few tablets in a polyethylene? container. Ideally should be ground to a flat sheet for xrf Anyway my xrf show peaks of Ti? and? Fe like the lab results Best stay away from generics for long term usage drugs Taray |
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Locked
Re: Skimming angle XRF- Experiment
pic of setup, taken through the 1.5" thick scatter shield.
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Locked
Re: Skimming angle XRF- Experiment
A flat steel snap-spring, happened to be in the junk box. Probably off some old GM probe etc. Looking closer, it's the remains of an LND 725 tube.
Very thin and hard, the sort of material you would use in a C-?clip or some other springy hardware. Notice the ball mounted sample holder- it has multiple degrees of adjustment to fine tune the target position. When the right spot is found, there is no question as the peaks literally jump up on the scan screen. Usually there is a slight delay in seeing the peaks jump up, so one tends to go past the correct angle or position requiring a little touch up here and there. There is very little hysteresis in the ball mount so this whole alignment process takes only seconds to initially set up. Very little actual energy is required in the beam, and it is precisely placed. A multi-capillary lens at this point in the setup would greatly increase the beam efficiency, since right now we have to generate more than is needed, and waste everything not in the exact geometry we want. We're looking at the surface of spring in only a 1mm wide round? spot. It is 1mm from the face of the tungsten collimator/scatter shield and the beam is shooting up between the spring and the collimator surface at a skimming angle. Excited XRF goes directly? into the 1mm hole and into the Si-PIN detector though it's Be window. Only the middle <1mm^2 of the 25mm sensor is used for this test, this area is all that is needed, and is the purest place to read the signal, well away from the sensors internal collimator materials. 30kV @ 15Ua for 400 seconds. Pictures show the peaks for the elements we found. Less prominent peaks are shown with the vertical scale gain being adjusted accordingly. Energy response of the probe is pretty flat across the 5 to 25 keV range and well documented- covering? the metals?Ti though U by either K or L lines.. I'll leave this set up for a while and will be glad to make any follow-up measurements using different arrangements of target, beam, collimators, whatever. Geo |
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Vanadium
taray singh
Hi guys
Vanadium is quite an elusive element and rarely makes a? solo appearance? in xrf spectrum?? Usually associated with Fe,Cr? or titanium alloys Used in implants and tools etc The very fact it lies between Ti and Cr with closely resembling peaks makes it? quite indistinguishable. My attempts to capture V peaks clear cut has failed? before. Today I placed a few grams of? almost pure V in a small polyethylene? container? . The peaks for V are noted together with Fe probably impurities. My sample is not magnetic, testing with a strong Nd magnet A? comparison? ?spectrum of empty polyethylene containers show some residual Pb like in the V spectrum Pics for vanadium ore ,vanadium spectrum and V/ polyethylene mca Taray |
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Re: Brown Crystal Cluster Ca-Fe-Zn more
¿ªÔÆÌåÓýGeo, Turn off Old ROI¡¯s before posting then do an interpretation based on energy of the peak¡¯s high count then look for associated x-rays and then nearby energy x-rays that are La or Ka¡¯s, and don¡¯t use linear mode. ?In Log space Si at 1.75, possible Al at 1.5 but you cut off the LLD too early to see and there aren¡¯t enough counts to say anyhow.. Sulfur at 2.3, Ca at 3.7, Fe at 6.4, There is Cu at ?8.0 and 8.9 but W interferes with it at 8.4 and the Pb Ll also interferes with it at 9.1keV. There doesn¡¯t appear to be any Zn but the W is wiping out any evidence of small amounts. At 9.7 the rest of a 1mm W collimator can be seen. Pb dominates this spectrum with L1,2 at 10.55, Lh at 11.4, and the Lb1-6 convolved together at 12.6 keV. Y is seen at 14.9 keV If it has a blue color and it looks metallic or dull blue grey and given the dominant Pb and high Sulfur in this shot I¡¯d say this is probably Galena PbS and it should form a cubic crystal with good cleavage. \Dud ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? [Edited
Message Follows] When you have time Dud, see what you find here- it's a smaller tan crystal cluster, and we're looking at a blue patch on the distal end. Geo |
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Re: Brown Crystal Cluster Ca-Fe-Zn more
Dud, there is a 1mm collimator on the beam too. Yes the W L-lines preclude and testing right there. For sure. Geo From: "DFEMER" <dfemer@...> To: [email protected] Sent: Monday, January 25, 2021 1:39:57 PM Subject: Re: [XRF] Brown Crystal Cluster Ca-Fe-Zn more Geo, Here¡¯s a good example of what we have been talking about. You have a 1mm W collimator peak sitting in the middle of the important Zn, Cu, W, Ta window with a ?reduced resolution due to the wide 93.8 energy span. The 1mm collimated aperture is illuminating only 1mm of a 25 mm detector, dramatically cutting down your count rate and for what benefit? What is its purpose? It should be on the X-ray tube. ?For a 300 sec count all you¡¯re seeing is 142 Ca counts and the other peaks are only 10 counts or so. That is noisy data and both problems could be cleaned up by removing the W collimator and running the energy span to optimize the channel resolution. I also suspect your interpretation is based on other ROI¡¯s from a previous file. Note there is no Ba or Sr in these ROI¡¯s. The 8.6 keV Zn is not resolved from the W 8.4 due to the FWHM of the W peak. Moreover, the Zn Kb 9.6 keV coincides with the W 9.6 and without better resolution you can¡¯t say there is Zn there unless you could confirm the Zn La¡¯s at 1 keV but the LLD is set to cut off at 1.35. ?It¡¯s also too close to define Si at 1.7. There is a hint of P trying to show at 2.0 but it needs lots more counts ?Cu is just resolved at 8.0 and I ?wonder where the Y came from. Based on the high Ca I¡¯d call this a dirty CaCO3. I can¡¯t see the crystal faces well enough to call it a Calcite or an Aragonite. But there are one or two pointed crystals that may be Dog Tooth Spar which would call it Calcite Is there a mineralogist in the house? Come on Geo, change the energy span, drop the LLD lower and remove the collimator you¡¯ll be really happy you did Dud ? ? ? ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ?
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Re: Brown Crystal Cluster Ca-Fe-Zn more
¿ªÔÆÌåÓýGeo, Here¡¯s a good example of what we have been talking about. You have a 1mm W collimator peak sitting in the middle of the important Zn, Cu, W, Ta window with a ?reduced resolution due to the wide 93.8 energy span. The 1mm collimated aperture is illuminating only 1mm of a 25 mm detector, dramatically cutting down your count rate and for what benefit? What is its purpose? It should be on the X-ray tube. ?For a 300 sec count all you¡¯re seeing is 142 Ca counts and the other peaks are only 10 counts or so. That is noisy data and both problems could be cleaned up by removing the W collimator and running the energy span to optimize the channel resolution. I also suspect your interpretation is based on other ROI¡¯s from a previous file. Note there is no Ba or Sr in these ROI¡¯s. The 8.6 keV Zn is not resolved from the W 8.4 due to the FWHM of the W peak. Moreover, the Zn Kb 9.6 keV coincides with the W 9.6 and without better resolution you can¡¯t say there is Zn there unless you could confirm the Zn La¡¯s at 1 keV but the LLD is set to cut off at 1.35. ?It¡¯s also too close to define Si at 1.7. There is a hint of P trying to show at 2.0 but it needs lots more counts ?Cu is just resolved at 8.0 and I ?wonder where the Y came from. Based on the high Ca I¡¯d call this a dirty CaCO3. I can¡¯t see the crystal faces well enough to call it a Calcite or an Aragonite. But there are one or two pointed crystals that may be Dog Tooth Spar which would call it Calcite Is there a mineralogist in the house? Come on Geo, change the energy span, drop the LLD lower and remove the collimator you¡¯ll be really happy you did Dud ? ? ? ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ?
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Re: Obsidian
Just the one big cable in the back then? That must be yet another variant. Got pics? Geo From: GEOelectronics@... To: [email protected] Sent: Sunday, January 24, 2021 10:11:43 PM Subject: Re: [XRF] Obsidian OK I had to look to be sure. Both control units are marked LIXI PS-500, one has a connector on the front for the head wire (just 1 cable) and that's the one in my office. The one downstairs has all the cables and HV out the back. Two completly different and non compatible heads. From: "DFEMER" <dfemer@...> To: [email protected] Sent: Sunday, January 24, 2021 8:48:17 PM Subject: Re: [XRF] Obsidian I have 2 Kevex CU015 power supplies for the head and a LIXI PS-500-OS. What setup are you running? Dud ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Was that out of a LIXI and has a LIXI controller or does it use a Spellman power supply? ? ? From: "DFEMER"
<dfemer@...> ? No they¡¯re just sitting there I haven¡¯t fired it up with anything yet. The plan was to use them with the SiLi detector when I get a load of LN2 but the SDD is so much easier and nicer. Can you run the comparison tests, I¡¯m curious to see the difference. Dud ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Dud are you using your Kevex? If so on what? Geo ? From: "DFEMER"
<dfemer@...> ? That should be the same one I have here a Kevex W micro focus. I ?don¡¯t see why you need to have 2 positions or a detector collimator, it will work fine with just ?a close up detector and no collimator. For low energy work you run a 15 kVp beam. You want to set the beam voltage about 10 keV above the K edge. Run 2 test shots, no detector collimator close up and with collimator close up. Try a 15 or 20 kVp beam if it¡¯s not filtered which I don¡¯t think the Las Vegas one was. ?All XRF needs to be done close up to maximize signal and minimize air absorption. What is you close up and far distance? You should be able to see Si, K, and Ca as they are important in determining what type of rock you¡¯re looking at. Dud From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Low energy is for below W L peaks, like K and Ca. Low energy from sample can't travel far in air, needs to be really close, the W L lines don't interfere with the wanted rays. ? What I have now is the same unit I had in Las Vegas in 2013. ? ? From: "DFEMER"
<dfemer@...> ? Geo, What is the high energy position and purpose for both? I¡¯m seeing W in the spectra is this the high energy position run? What Is the purpose of the W 1mm collimator on a 25mm detector? The collimator and filter is used on the x-ray exit. ?Can you do the same run without it and close up detector. The newer commercial units use a 45 deg setup with the detector the closest to the sample and it runs well down into the 1-2 keV range. Dud ? ? ? ? ? ? ? ? ? ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Back to Obsidian.? ? ? ? |
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Re: Obsidian
¿ªÔÆÌåÓýBoth the Kevex CU015 and the LIXI have the control cable in back neither has a HV cable or SO 239. The HV power supply is in the head. The LXI has a jack for camera interlock and foot switch.. dud ? ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Is there a what looks like a UHF SO-239 connector on the head or the CU series power supply or your version of the LIXI PSU? ? om: GEOelectronics@... ? This one is the PS-500-OS power supply- this version has no HV power supply inside, it is in the head. There are two versions, one controls the HV generator in the head with 12V signals, the other has the HV power supply in the control box and LV cables to the head and a single HV cable looks like RG-8. That's the newer kind and the style of the one in the basement here. I've worked with a several? of both styles in the past but only have the 2 now. ? From: "DFEMER"
<dfemer@...>
To: [email protected] Sent: Sunday, January 24, 2021 8:48:17 PM Subject: Re: [XRF] Obsidian ? I have 2 Kevex CU015 power supplies for the head and a LIXI PS-500-OS. What setup are you running? Dud ? From:
[email protected] [mailto:[email protected]] On Behalf
Of GEOelectronics@... ? Was that out of a LIXI and has a LIXI controller or does it use a Spellman power supply? ? ? From: "DFEMER"
<dfemer@...> ? No they¡¯re just sitting there I haven¡¯t fired it up with anything yet. The plan was to use them with the SiLi detector when I get a load of LN2 but the SDD is so much easier and nicer. Can you run the comparison tests, I¡¯m curious to see the difference. Dud ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Dud are you using your Kevex? If so on what? Geo ? From: "DFEMER"
<dfemer@...> ? That should be the same one I have here a Kevex W micro focus. I ?don¡¯t see why you need to have 2 positions or a detector collimator, it will work fine with just ?a close up detector and no collimator. For low energy work you run a 15 kVp beam. You want to set the beam voltage about 10 keV above the K edge. Run 2 test shots, no detector collimator close up and with collimator close up. Try a 15 or 20 kVp beam if it¡¯s not filtered which I don¡¯t think the Las Vegas one was. ?All XRF needs to be done close up to maximize signal and minimize air absorption. What is you close up and far distance? You should be able to see Si, K, and Ca as they are important in determining what type of rock you¡¯re looking at. Dud From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Low energy is for below W L peaks, like K and Ca. Low energy from sample can't travel far in air, needs to be really close, the W L lines don't interfere with the wanted rays. ? What I have now is the same unit I had in Las Vegas in 2013. ? ? From: "DFEMER"
<dfemer@...> ? Geo, What is the high energy position and purpose for both? I¡¯m seeing W in the spectra is this the high energy position run? What Is the purpose of the W 1mm collimator on a 25mm detector? The collimator and filter is used on the x-ray exit. ?Can you do the same run without it and close up detector. The newer commercial units use a 45 deg setup with the detector the closest to the sample and it runs well down into the 1-2 keV range. Dud ? ? ? ? ? ? ? ? ? ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Back to Obsidian.? ? ? ? ? ? |
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Re: Obsidian
OK I had to look to be sure. Both control units are marked LIXI PS-500, one has a connector on the front for the head wire (just 1 cable) and that's the one in my office. The one downstairs has all the cables and HV out the back. Two completly different and non compatible heads. From: "DFEMER" <dfemer@...> To: [email protected] Sent: Sunday, January 24, 2021 8:48:17 PM Subject: Re: [XRF] Obsidian I have 2 Kevex CU015 power supplies for the head and a LIXI PS-500-OS. What setup are you running? Dud ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Was that out of a LIXI and has a LIXI controller or does it use a Spellman power supply? ? ? From: "DFEMER"
<dfemer@...> ? No they¡¯re just sitting there I haven¡¯t fired it up with anything yet. The plan was to use them with the SiLi detector when I get a load of LN2 but the SDD is so much easier and nicer. Can you run the comparison tests, I¡¯m curious to see the difference. Dud ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Dud are you using your Kevex? If so on what? Geo ? From: "DFEMER"
<dfemer@...> ? That should be the same one I have here a Kevex W micro focus. I ?don¡¯t see why you need to have 2 positions or a detector collimator, it will work fine with just ?a close up detector and no collimator. For low energy work you run a 15 kVp beam. You want to set the beam voltage about 10 keV above the K edge. Run 2 test shots, no detector collimator close up and with collimator close up. Try a 15 or 20 kVp beam if it¡¯s not filtered which I don¡¯t think the Las Vegas one was. ?All XRF needs to be done close up to maximize signal and minimize air absorption. What is you close up and far distance? You should be able to see Si, K, and Ca as they are important in determining what type of rock you¡¯re looking at. Dud From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Low energy is for below W L peaks, like K and Ca. Low energy from sample can't travel far in air, needs to be really close, the W L lines don't interfere with the wanted rays. ? What I have now is the same unit I had in Las Vegas in 2013. ? ? From: "DFEMER"
<dfemer@...> ? Geo, What is the high energy position and purpose for both? I¡¯m seeing W in the spectra is this the high energy position run? What Is the purpose of the W 1mm collimator on a 25mm detector? The collimator and filter is used on the x-ray exit. ?Can you do the same run without it and close up detector. The newer commercial units use a 45 deg setup with the detector the closest to the sample and it runs well down into the 1-2 keV range. Dud ? ? ? ? ? ? ? ? ? ? From:
[email protected] [mailto:[email protected]] On
Behalf Of GEOelectronics@... ? Back to Obsidian.? ? ? ? |
