Re: Apparent Discrepancy in Am241 ALI in EPA-11

[John_Sukosky@DOM.COM]

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.  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) 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 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>             

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                      owner-radsafe@list.van        Subject:  Apparent Discrepancy in Am241 ALI in EPA-11                               

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                      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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