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Re: Thorium in urine
The thorium in urine background is highly variable. The ICRP 23 value is 0.1
ug/day.
P.Roth et. al., Journal of Radioanalytical and Nuclear Chemistry, Vol. 226, 1997
is a reference. They report:
Background Urinary excretion of Th-232 average: 47+/-27 uBq/day with a range
between 9 and 121 uBq/day. One person varied between 26 and 167 uBq/day over a
15 day period.
P Roth also refers to several studies, including:
H. Dang, Health Physics, 1989: 16+/-6 uBq/day
Minoia, Sci. Tot. Environ., 1990: 0.35+/- 0.16 mBq/liter with a range from 0.04
to 2.9 mBq/liter.
>From my own experience, I am reasonably certain that there are a number of
individuals (in the U.S.) with much higher levels of ambient thorium in their
urine and that the levels fluctuate for even more dramatically than what has
been published.
Of course, all thoughts are entirely my own and do not necessarily reflect that
of my employer or clients.
Brian Keele, CHP
BLHamrick@AOL.COM on 04/03/2001 11:34:34 PM
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Subject: Thorium in urine
Does anyone have a reference for an average (i.e., background value) of
thorium in human urine?
Thank you,
Barbara L. Hamrick
BLHamrick@aol.com
Does anyone have a reference for an average (i.e., background value) of
thorium in human urine?
Thank you,
Barbara L. Hamrick
BLHamrick@aol.com