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Dear All, I sincerely thank all the listemebers who responded to my above enquiry. The suggestions given by all of you were very much helpful and we are getting good results. We are able to detect and determine up to 2% of UO2 in (UO2+ThO2). We are trying to improve the results better. Thanking all of you with best regards Nand Lal -------------------- Dr. Nand Lal Misra Scientific Officer-F and Asstt. Prof. HBNI, Mumbai Group Leader, X-ray Spectrometry Group, Fuel Chemistry Division Bhabha Atomic Research Centre, Mumbai 400 085 India Member, Editorial Board "X-ray Spectrometry" Email: [log in to unmask], [log in to unmask] Tel 91-22-2559 4094 (O), 91-22-25502447 (R) -------------------- ----- Original Message ----- From: Edward Laitila <[log in to unmask]> To: [log in to unmask] Sent: Wed, 1 Dec 2010 19:53:57 +0530 (IST) Subject: Re: Quantitative phase analysis by XRD Nand, The voltage and current settings on the generator play a large role on the intensity of the x-rays. Counting statistical error is really related to total number of counts collected, both count time and tube settings effect the counts collected (as well as optics). Always have a higher tube voltage than current since the intensity of characteristic lines produced by the x-ray tube is proportional to the voltage to a power (~1.5) whereas the current is linear. You may also want to consider tube life, running at maximum power decrease tube life, since cost is more important than time for us we operate the tube at ~ 70% or maximum power, hence tubes last much longer. Additionally, on tube life minimize turning the generator on and off, typically we leave the tube on unless it will not be used for several days. Regards, Ed ----- Original Message ----- From: "NANDLAL Misra" <[log in to unmask]> To: [log in to unmask] Sent: Wednesday, December 1, 2010 9:12:15 AM GMT -05:00 US/Canada Eastern Subject: Re: Quantitative phase analysis by XRD Thank you Ed We have used a time of 10 s and we are able to detect 2% UO2 in UO2+THO2 mixture. I will contact you later if required. Will current and votage changes make some effect on results? Thnaking you once again for your advice. ----- Original Message ----- From: Edward Laitila <[log in to unmask]> To: [log in to unmask] Sent: Wed, 24 Nov 2010 20:01:26 +0530 (IST) Subject: Re: Quantitative phase analysis by XRD Nand, To improve detection limits make sure your count time is at least 20 seconds (of course depends on system), I have measured to a fraction of a percent. Also make sure the beam is smaller (in the tube detector plane) than the sample width failure to do so for peaks at that particular angle can cause large errors. Good Luck, Ed ----- Original Message ----- From: "NANDLAL Misra" <[log in to unmask]> To: [log in to unmask] Sent: Wednesday, November 24, 2010 3:01:03 AM GMT -05:00 US/Canada Eastern Subject: Quantitative phase analysis by XRD Hello All, We are interested in quantitative analysis of thorium and uranium oxides in their mixtures by XRD using Cu Ka X-ray Tube. I request advice of all of you for better detection limit. Kindly also advise what is the probable detection limit and precision achievable using Tube sources. Suitable references shall be highly appreciated. Thanking in advance. Nand Lal Misra ------------------- Dr N.L. Misra, Scientific Officer, FCD, BARC, Mumbai 400 085 ---------------- ______________________________________________ XRD mailing list [log in to unmask] http://www.jiscmail.ac.uk/lists/xrd.html To leave the list use the webpage or send an email to: [log in to unmask] with the text SIGNOFF XRD -- Instructor Engineer/Scientist Michigan Technological University Dept of Materials Science and Engineering Phone:(906) 369-2041 Fax: (906) 487-2934 http://www.mse.mtu.edu/ http://mcff.mtu.edu/acmal/xrdoverview.htm ______________________________________________ XRD mailing list [log in to unmask] http://www.jiscmail.ac.uk/lists/xrd.html To leave the list use the webpage or send an email to: [log in to unmask] with the text SIGNOFF XRD ______________________________________________ XRD mailing list [log in to unmask] http://www.jiscmail.ac.uk/lists/xrd.html To leave the list use the webpage or send an email to: [log in to unmask] with the text SIGNOFF XRD -- Instructor Engineer/Scientist Michigan Technological University Dept of Materials Science and Engineering Phone:(906) 369-2041 Fax: (906) 487-2934 http://www.mse.mtu.edu/ http://mcff.mtu.edu/acmal/xrdoverview.htm ______________________________________________ XRD mailing list [log in to unmask] http://www.jiscmail.ac.uk/lists/xrd.html To leave the list use the webpage or send an email to: [log in to unmask] with the text SIGNOFF XRD ______________________________________________ XRD mailing list [log in to unmask] http://www.jiscmail.ac.uk/lists/xrd.html To leave the list use the webpage or send an email to: [log in to unmask] with the text SIGNOFF XRD