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Well,
based on the "thickness of 0.43mm (0.7grams/sq.inch),"
the density is 2.5 gm/cm^2, while the density of carbon is 2.25 gm/cm^2 and that
of aluminum is 2.7 gm/cm^2. Interesting, as some efforts in nanotechnology is
based on based on carbon tubes. If the shielding efficiency is similar to
that 0.5 mm of Pb, I can see see a value in fluoro radiology as the lead-vinyl
aprons are 4.73 gm/sq.inch and is 1.58 mm thick. I notice that the x-ray
attenuation values are not compared to the 0.5 mm equivalent leaded apron, which
should be based on maximum kVp, not "average Kv level."
Of
course, I am assuming that all of there numbers a valid. As someone
pointed out, the maximum beta particle of Si-32 is not 1800 keV. Beta
particles from P-32 are about that value.
I believe that shielding is based on the electron density of
the material. Of course, the electron density is related to the density of
the material.
-- John e-mail: jenday1@msn.com
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