Proposal for SAS Interlaboratory Test Program
John D. Barnes
john.barnes at nist.gov
Tue Dec 1 16:55:38 CST 1998
SAS Interlaboratory Test Program
Solicitatiuon of Intent to Participate
Given that the worldwide SWmall-Angle Scatterinig community consists of
something like 1500 practitioners, now seems like a good time to evaluate
the performace of the measuring system represented by SAS techniques in
an objective manner.
The generally accepted way to conduct such assessments of performance of
a measuring system is through a suitably designed interlaboratory test
program, commonly referred to as a "round-robin." This name persists in
spite of the fact that it is usually not necessary to pass samples from
one laboratory to another. Simple plots of results from a couple of
specimens of suitably homogenmeous materials obtained in different
laboratories are usually sufficient to demonstrate whether existing
standards are adequate or need improvement.
This announcement is intended to determine whether the SAS community is
interested in such an undertaking and to solicit suggestions that would
aid in the design of such a program.
Please e-mail your replies to the following questions to me at
john.barnes at nist.gov. I will collate the results, publish them, and
consult with other members of the IUCr SAS Commission to determine what
the next steps ought to be.
1. Would you be interested in carrying out measurements on specimens of
between 2 and 4 materials and reporting thye results for tabulation?
2. If your answwer to question 1 is "yes" what materials would you
suggest as being appropriate for use in an interlaboratory test program?
What attributes of these materials should be measured?
In order to focus the discussion I would prefer to designj the program in
a ammner that will let virtually any member of the SAS community
participate. This implies that test scatterers should be isotropic, so
that people with 1-d systems can characterize them. It would be desirsble
to have materials that are suitable for use with both neutrons and
x-rays. The amount of sample handling required for an end user to carry
out the measurmenets should be minimized.
3. What methods (SAXS, SANS, USAXS, SALS, etc) would you be able to
4. Can you suggest sources of suitable materials?
5. Would you be able to manufacture samples for one or more of these
6. What test results should participants submiut? What particulars of the
experiment should be included asauxiliary data to be submitted by the
Dr. John D. Barnes email: john.barnes at 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
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