RE: Lower limit for SCO 1 classification

["Alan R. Marchand" <radarm@accessnv.com>]

look up in the 49 CFR 171.10.  SI units are Regulatory standard. Units in parentheses are for information only and not intended to be regulatory standard.

Alan R. Marchand
Las Vegas, NV
radarm@accessnv.com

At 08:01 AM 11/6/98 -0600, you wrote:
>Response to this statement:
>
>Look at the definition of Radioactive material in 173.403 again. 70 Bq is
>the limit by law. This equal 1.89 nCi.
>
>
>Just how many significant figures is 70 Bq/g good for?  One significant
>figure would generate 2 nCi, not 1.89 nCi.  I wonder how many significant
>figures are applicable?  Look at the DAC values in 10CFR20.  They clearly
>display only one significant figure of precision.  The degree of precision
>is not entirely clear here. 
>
>Look at RQ values, the TBq values are clearly the conversion of the standard
>Ci.  The contamination limit standard appears to be 1E-5 and 1E-6 uCi/cm2
>and the conversion would be the 0.4 and 0.04 Bq/cm2 or the 22 or 2.2
>dpm/cm2.  If the Bq were the standard, surely the would have chosen
>something like 0.5 Bq/cm2.  When they write 0.04 they are definitely not
>trying to imply anything more than 1 significant figure.
>
>I don't know of anyone ever being audited to 1.89 nCi/g vs 2 nCi/g.  Any
>thoughts out there?
>
>
>Sincerely,
>Glen Vickers
>glen.vickers@ucm.com
>
>       
>
>       
>       At 02:36 PM 11/4/98 -0600, you wrote:
>       >I believe NUREG 1608 explicitly states that the contamination
>limits are
>       >those on the equipment and your smears can only be a tenth of that
>limit
>       >because of the 10% smear efficiency.
>       >
>       >As far as lower limits go, NUREG 1608, 3.1.2. says that if your
>material is
>       ><2 nCi/g, 2200 dpm/100 cm^2 beta/gamma, and 220 dpm/100 cm^2 alpha
>then it
>       >is below DOT concern.  This is where the free-release policy for
>your
>       >facility comes in.
>       >
>       >NUREG 1608 3.1.3. says that if you have a "limited quantity", then
>you may
>       >ship as a limited quantity and not SCO.
>       >
>       >Sincerely,
>       >Glen Vickers
>       >glen.vickers@ucm.com
>       >
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