[OPEN END DISCUSSION FOR PROCEEDINGS OF AIR CLEANING CONFERENCE (U.S.A.E.C.)]. Page: 1 of 6
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Proceedings of the lth U.S.A.E.C. Air Cleaning Conference, Oak Ridge,
Tennessee, August 28-31, 1972. Open End Discussion on August 31, 1972.What I'd like to talk about very briefly, because I know
it's late and you all want to go, is the subject of filtration in
general, particularly as it relates to particle size and to plutonium.
I was going to make a comment earlier in the morning, but because of
the shortage of time in the general discussion, I didn't get the
chance to do so.
My qualifications for talking on this subject at all are that I
have been working extensively with both 238- and 239-dioxide, for the
last three years. We have taken thousands of samples and attempted
to obtain particle size distributions on thousands of samples of both
isotopes. The first comment that I would like to make is that we have
consistently found a significant difference in particle size distri-
bution of plutonium-238 and plutonium-239 dioxide aerosols, even though
we've used absolutely, as far as possible, identical methods of pre-
paration. This is a comment that might be of soma importance in
considering filtration.
The second point refers to the relationship between particle
size and filtration. Now if we neglect electrostatic effects, the
major mechanisms determining filtration of particles are impact-on,
sedimentation, and diffusion. If we plot particle diameter on a log
scale, stretching from .01 to 10 microns, and displacement in centimeters
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iI is U~ffE
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Craig, D.K. [OPEN END DISCUSSION FOR PROCEEDINGS OF AIR CLEANING CONFERENCE (U.S.A.E.C.)]., report, April 30, 1973; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1035494/m1/1/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.