Hi Steve - I have been working this issue more as an internal issue than an
external issue (although the NASA advisory does point out a "new" potential
source of xray damage to electronic assemblies we used to not have to
consider). Some papers which may be of interest:

1) "Xray Inspection: Easy Does It", Feb 2002 issue of EPP, page 40, author:
Tom Clifford

2) Nicolet Test Instruments Division Application Note: Ionizing Radiation
and Its Effects Upon Electronic Components

3) Sandia Labs Report SAND82-2151m January 1983

4) "Filter Optimization for Xray Inspection of Surface Mounted ICs",
Richard Blish II, et al, IEEE Transactions on Device and Materials
Reliability, Vol. 2, No. 4, Dec 2002

The "equation" for understanding the radiation dose a component can receive
is a combination of a number of factors - you just can't pick one parameter
to focus on or you can get your self into trouble.

Dave Hillman
Rockwell Collins
[log in to unmask]




                      Steve Gregory
                      <[log in to unmask]        To:       [log in to unmask]
                      M>                       cc:
                      Sent by: TechNet         Subject:  [TN] GSFC/NASA  Advisory about Terrestrial Sources of X-Ray Radiation
                      <[log in to unmask]>


                      09/10/2003 08:27
                      AM
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to
                      SteveZeva






Hi All!

Please go to: http://xnwp021.utc.com/Ebiz/supplier/NASAADVISORY.pdf

and read this document. We were sent this link by one of our customers, and
told that before we ship any of their hardware, the carrier must ensure
that they will not expose the hardware to Tomographic X-Ray inspection.

Are any of you dealing with this? If so, how, or what did you do?

-Steve Gregory-
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