Trevor,
The original question here confused me too. As the vendor and instrument model were not mentioned I assumed this was a general question about XRD. A NIST standard and "certified intensities" were mentioned. Which makes no sense. How could NIST certify intensities? Now I see this is not only a vendor specific but also instrument specific question. Perhaps the question would have been better addressed directly to Bruker in the first place. The original question stated that the intensities did not match the certified values, not that they were low, and that they varied quite significantly. So does that mean the intensities are higher than normal and noise is the problem or that they are so low alignment and poor counting statistics is the problem. She wants us to tell her what her problem is and how to solve it, but I think a little more information would help.
Mike Handley
Mike Handley Analytical Services
17143 S Ivy Cir
Houston TX 77084
Tel: 281 856 8893
Fax: 281 286 8393
web: www.myxrf.com
e-mail: [log in to unmask]
-----Original Message-----
From: Support and use of X-ray diffraction instrumentation [mailto:[log in to unmask]] On Behalf Of Trevor Todd
Sent: Friday, May 18, 2012 8:40 AM
To: [log in to unmask]
Subject: Re: NIST standard 1976 does not match certified intensities
You are correct in what you are saying if you are comparing the relative line intensites for sure. There isnt enough information to assume this though. For instance we use this standard as a verification procedure for checking the line intensities are the same in the factory as at the customer. We use actual intensities. If it is the relative intensities being used, as per the NIST document, then that is a different matter. Tube age is unimportant.
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