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buildup factors
Dear Colleagues:
I am working a problem that calls for calculating attenuation of low-energy
radiation (about 20 KeV photons) by thin to moderate layers of water (0.1 to
10 cm). The tables I have found in the Rad Health Handbook for buildup do
not consider photons less than 100 KeV. I would greatly appreciate any
suggested references for buildup factors of 20 KeV photons in water.
In a related problem, I am trying to find similar factors for 200 KeV
photons in air, but over very long distances (up to 150 relaxation lengths).
This information is posing similar problems as the RHH goes up to 40
lengths.
If you reply to me directly, I can post a summary to Radsafe. Thanks in
advance for your help.
Sincerely,
Andy
Andrew Karam, CHP (716) 275-1473 (voice)
Radiation Safety Officer (716) 275-3781 (office)
University of Rochester (716) 256-0365 (fax)
601 Elmwood Ave. Box HPH Rochester, NY 14642
Andrew_Karam@URMC.Rochester.edu
http://Intranet.urmc.rochester.edu/RadiationSafety
Mathematics may be compared to a mill of exquisite workmanship which grinds
you stuff of any degree of fineness; but, nevertheless, what you get out
depends on what you put in; and as the grandest mill in the world will not
extract wheat-flour from peascods, so pages of formulae will not get a
definite result out of loose data. (T.H. Huxley, 1869)
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