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SAS Intensity standardization
- Subject: SAS Intensity standardization
- From: "John D. Barnes" <john.barnes@nist.gov>
- Date: Fri, 4 Dec 98 20:50:21 -0500
Dear Friends; First of all I would like to thank the many people who have replied to my earlier posting regarding possible interlaboratory test programs for SAS. I should mention that there have been a couple of different propoals along this line since the IUCr SAS Commission was formed in 1996. These never got anywhere because there was no formal protocol and because they did not address the questions that are really at the core of these matters. On the basis of some recent correspondence with one of my friends I have decided to proble a little more deeply into the genral questions surrounding our ability to characterize precision (and perhaps, to some extent, accuracy) in generic measurements using SAS techniques. I need to gather a little more intelligence on these subjects before I try to recruit people for a technical effort of this sort. I therefore submit the folowing questions in the hope that people with more institutional memory than I have can save us some reinventing of the wheel. 1. Can anyone provide literature references to studies of variability in intensiity measurements since the work of Hendricks under IUCr sponsorhip in the mid-seventies? 2. Please add any items that you can to the following (naive?) list of physical observables that depend on the ability to measure scattered intensity on an absolute scale: a. molecular mass of macromolecules b. interfacial areas in two-phase materials c. total scattering "invariant" in two-phase materials I have omitted items that I (perhaps mistakenly) believe can be estimated knowing only relative intensities. I am most interested in observavbles that are of practical rather than theoretical interest. Thank You Dr. John D. Barnes email: john.barnes@nist.gov Natl Inst of Stds and Tech Voice: 301-975-6786 100 Bureau Drive, Stop 8544 FAX: 301-975-4977 Gaithersburg, MD 20899 URL: http://www.nist.gov/sas or http://www.ctcms.nist.gov/~jdbarnes
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