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Re: Apparent Discrepancy in Am241 ALI in EPA-11
Correction: The limiting organ indicated below should be bone surface not
bone marrow.
John M. Sukosky, CHP
Dominion
Surry Power Station
(757)-365-2594 (Tieline: 8-798-2594)
John_Sukosky@DOM.COM
Sent by: To: "Michel, Lee S" <michel@BNL.GOV>
owner-radsafe@list.van cc: "'radsafe'" <radsafe@list.vanderbilt.edu>
derbilt.edu Subject: Re: Apparent Discrepancy in Am241 ALI in EPA-11
11/19/2004 06:17 PM
Please respond to
John_Sukosky
The ALI value of 0.006 micro-Ci is the more limiting non-stochastic ALI
which would result in 50 REM CDE to the bone marrow surface. The table 2.1
value
of 1.2E-4 Sv/Bq is equivalent to the less restrictive stochastic ALI of
0.01 micro-Ci which would result in 5 REM CEDE. In other words, a worker
breathing an airborne concentration of Am-241 will reach the 50 REM organ
(bone marrow surface) limit before reaching the 5 REM CEDE limit. So in
your
example below, the 120 pico-Ci intake would result in 1000 mrem CDE to the
bone marrow surface and 60 mrem CEDE. The 225 pico-Ci intake would result
in ~100
mrem CEDE. I'm not familiar with the DOE regs but I would guess that there
would be a level of exposure (comparable to the 100 mrem level for CEDE)
when organ dose is the more limiting.
John M. Sukosky, CHP
Dominion
Surry Power Station
(757)-365-2594 (Tieline: 8-798-2594)
"Michel, Lee S"
<michel@BNL.GOV> To:
"'radsafe@list.vanderbilt.edu'" <radsafe@list.vanderbilt.edu>
Sent by: cc:
owner-radsafe@list.van Subject: Apparent
Discrepancy in Am241 ALI in EPA-11
derbilt.edu
11/19/2004 02:41 PM
Please respond to
"Michel, Lee S"
Im hoping someone can explain the difference in Committed effective dose
equivalent in table 1 versus table 2 of FGR - 11 for Americium 241.
In table 1.b the ALI (inhalation) is 0.006 micro-Ci. This would therefore
determine a dose of 100 mrem from an intake of 120 pico-Ci.
In table 2.1 the CEDE inidicated is 1.2E-4 Sv/Bq, which translates to
444,000 mrem per micro-ci. This would therefore determine a dose of 100
mrem from an intake of 225 pCi.
Since I work at a DOE national Lab, I am interested in the 100 mrem level
of
exposure to satisfy 10CFR835.
Any guidance on this apparent discrepancy would be appreciated.
Lee Michel, RRPT
Personnel Monitoring, Bldg 490
Brookhaven National Laboratory
Upton, NY 11973
(631)344-6306
michel@bnl.gov
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