On Thu, 17 Jan 2008, Paul Scott wrote:

"Tom Anderson" wrote in message
h.li...

PS what do you call the subdivision of a circle that's the part of a
sector between two concentric circles? I'm calling it a block because
of hard disks, but it must have a proper name.

Is it an annular sector?

Aha. That's certainly what this report on people being exposed to
radiation from a reprocessing plant calls them:

http://www.globalsecurity.org/wmd/li...eis0220_4.html

This analysis of outgassing calls them 'annulus sectors', which comes to
much the same thing:

http://www.gps.caltech.edu/genesis/Outgassing.html

tom

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