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RE: Need conversion from mrad/h to dpm/100 cm^2; beta and alpha D
I hope everyone was aware that, yes indeed, there are numerous variables to
take into consideration, and this method was suggested to get a "ballpark"
figure.
Jim Bult
NASA MSFC RSO
> ----------
> From: Lavera, Ron[SMTP:Ron.Lavera@nypa.gov]
> Reply To: radsafe@romulus.ehs.uiuc.edu
> Sent: Friday, September 18, 1998 11:20 AM
> To: Multiple recipients of list
> Subject: RE: Need conversion from mrad/h to dpm/100 cm^2; beta and
> alpha D
>
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> If you plan to use a factor to convert from counts to uCi you need to be
> VERY aware of the fact that the conversion factor will change
> appreciably from place to place within the plant and sometimes within a
> system within the plant. The significant changes that may occur in
> isotopic mix, especially when trans-uranics may be present, can have a
> major impact to the total dose an individual accumulates per each "mR/h"
> indicated on the meter.
>
>
> ... Mine and mine alone ...
> Ron LaVera
> lavera.r@nypa.gov
>
> -----Original Message-----
> From: Bult, James [mailto:james.bult@msfc.nasa.gov]
> Sent: Friday, September 18, 1998 9:12 AM
> To: Multiple recipients of list
> Subject: RE: Need conversion from mrad/h to dpm/100 cm^2; beta and alpha
> D
>
>
> A conversion factor that we used very successfully in my days at
> Browns Ferry was 1 mRad/hr per about 22,000 dpm. The way this was
> accomplished was taking an open window contact dose rate on the smear,
> and
> multiplying the result by 100,000 to convert to dpm. The beta
> correction
> factor on each ion chamber was determined individually, but they were
> all in
> the area of 4.5. The answer is roughly 1.8E6 dpm/100cm2 assuming it was
> a
> standard 100cm2 smear.
>
> The folks at the plant would be your best source of info on your
> airborne activity questions.
>
> Jim Bult, RRPT
> NASA MSFC RSO
>
>
> > ----------
> > From: Strom, Daniel J[SMTP:daniel.j.strom@pnl.gov]
> > Reply To: radsafe@romulus.ehs.uiuc.edu
> > Sent: Thursday, September 17, 1998 5:48 PM
> > To: Multiple recipients of list
> > Subject: Need conversion from mrad/h to dpm/100 cm^2; beta and
> alpha
> > DACs
> >
> > Power reactor folks,
> >
> > I have a couple of questions on power reactor outage operations.
> >
> > 1. NRC Info notice 97-36, June 20, 1997 describes an incident in the
> fuel
> > transfer canal at Haddam Neck. Removable beta-gamma contamination is
> > given as
> > "80 mrad/hr." I need an estimate of the conversion from mrad/hr to
> > dpm/100
> > cm^2, and the variability in or range of this estimate (i.e., "1
> mrad/hr
> > is
> > within a factor of 2 of 5E6 dpm/100 cm^2 95% of the time." I'd also
> like
> > to
> > learn about what affect this conversion, e.g., age of fission
> products,
> > whether
> > it's fission or activation, etc.
> >
> > 2. In the same notice, the airborne radioactivity levels were quoted
> as
> > "0.8
> > DAC beta and 24 DAC alpha." What would these DACs be? Probably a
> > plant-specific value for the kind of stuff they usually find, but I'd
> like
> > to
> > know the isotope mix, the assumptions (D, W, Y mix, particle size),
> etc.,
> > that
> > are used for this kind of DAC. How do you calculate results in DACs?
> X
> > dpm
> > beta-gamma per m^3 is Y DAC, and Z dpm alpha per m^3 is W DAC?
> >
> > Thanks in advance for your help.
> >
> > - Dan Strom
> >
> > The opinions expressed above are my own, and have not been reviewed or
> > approved
> > by Battelle, the Pacific Northwest National Laboratory, or the U.S.
> > Department
> > of Energy.
> >
> > Daniel J. Strom, Ph.D., CHP
> > Risk Analysis and Health Protection, K3-56, Pacific Northwest National
> > Laboratory
> > Battelle Boulevard, P.O. Box 999, Richland, WA 99352-0999 USA
> > (509) 375-2626 fax: (509) 375-2019 daniel.j.strom@pnl.gov
> >
> >
> >
> ************************************************************************
> > The RADSAFE Frequently Asked Questions list, archives and subscription
> > information can be accessed at
> http://www.ehs.uiuc.edu/~rad/radsafe.html
> >
> ************************************************************************
> The RADSAFE Frequently Asked Questions list, archives and subscription
> information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html
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> charset=3Dus-ascii">
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> <TITLE>RE: Need conversion from mrad/h to dpm/100 cm^2; beta and alpha =
> D</TITLE>
> </HEAD>
> <BODY>
>
> <P><FONT SIZE=3D2>If you plan to use a factor to convert from counts to =
> uCi you need to be VERY aware of the fact that the conversion factor =
> will change appreciably from place to place within the plant and =
> sometimes within a system within the plant. The significant =
> changes that may occur in isotopic mix, especially when trans-uranics =
> may be present, can have a major impact to the total dose an individual =
> accumulates per each "mR/h" indicated on the =
> meter.</FONT></P>
> <BR>
>
> <P><FONT SIZE=3D2>... Mine and mine alone ...</FONT>
> <BR><FONT SIZE=3D2>Ron LaVera</FONT>
> <BR><FONT SIZE=3D2>lavera.r@nypa.gov</FONT>
> </P>
>
> <P><FONT SIZE=3D2>-----Original Message-----</FONT>
> <BR><FONT SIZE=3D2>From: Bult, James [<A =
> HREF=3D"mailto:james.bult@msfc.nasa.gov"; =
> TARGET=3D"_blank">mailto:james.bult@msfc.nasa.gov</A>]</FONT>
> <BR><FONT SIZE=3D2>Sent: Friday, September 18, 1998 9:12 AM</FONT>
> <BR><FONT SIZE=3D2>To: Multiple recipients of list</FONT>
> <BR><FONT SIZE=3D2>Subject: RE: Need conversion from mrad/h to dpm/100 =
> cm^2; beta and alpha</FONT>
> <BR><FONT SIZE=3D2>D</FONT>
> </P>
> <BR>
>
> <P> <FONT SIZE=3D2>A =
> conversion factor that we used very successfully in my days at</FONT>
> <BR><FONT SIZE=3D2>Browns Ferry was 1 mRad/hr per about 22,000 =
> dpm. The way this was</FONT>
> <BR><FONT SIZE=3D2>accomplished was taking an open window contact dose =
> rate on the smear, and</FONT>
> <BR><FONT SIZE=3D2>multiplying the result by 100,000 to convert to =
> dpm. The beta correction</FONT>
> <BR><FONT SIZE=3D2>factor on each ion chamber was determined =
> individually, but they were all in</FONT>
> <BR><FONT SIZE=3D2>the area of 4.5. The answer is roughly 1.8E6 =
> dpm/100cm2 assuming it was a</FONT>
> <BR><FONT SIZE=3D2>standard 100cm2 smear.</FONT>
> </P>
>
> <P> <FONT SIZE=3D2>The folks =
> at the plant would be your best source of info on your</FONT>
> <BR><FONT SIZE=3D2>airborne activity questions.</FONT>
> </P>
>
> <P> <FONT SIZE=3D2>Jim Bult, =
> RRPT</FONT>
> <BR> <FONT SIZE=3D2>NASA MSFC =
> RSO </FONT>
> </P>
> <BR>
>
> <P><FONT SIZE=3D2>> ----------</FONT>
> <BR><FONT SIZE=3D2>> From: =
> Strom, Daniel =
> J[SMTP:daniel.j.strom@pnl.gov]</FONT>
> <BR><FONT SIZE=3D2>> Reply To: =
> radsafe@romulus.ehs.uiuc.edu</FONT>
> <BR><FONT SIZE=3D2>> Sent: =
> Thursday, September 17, 1998 =
> 5:48 PM</FONT>
> <BR><FONT SIZE=3D2>> To: Multiple recipients of list</FONT>
> <BR><FONT SIZE=3D2>> Subject: Need =
> conversion from mrad/h to dpm/100 cm^2; beta and alpha</FONT>
> <BR><FONT SIZE=3D2>> DACs</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> Power reactor folks,</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> I have a couple of questions on power reactor =
> outage operations.</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> 1. NRC Info notice 97-36, June 20, 1997 =
> describes an incident in the fuel</FONT>
> <BR><FONT SIZE=3D2>> transfer canal at Haddam Neck. Removable =
> beta-gamma contamination is</FONT>
> <BR><FONT SIZE=3D2>> given as</FONT>
> <BR><FONT SIZE=3D2>> "80 mrad/hr." I need an =
> estimate of the conversion from mrad/hr to</FONT>
> <BR><FONT SIZE=3D2>> dpm/100</FONT>
> <BR><FONT SIZE=3D2>> cm^2, and the variability in or range of this =
> estimate (i.e., "1 mrad/hr</FONT>
> <BR><FONT SIZE=3D2>> is</FONT>
> <BR><FONT SIZE=3D2>> within a factor of 2 of 5E6 dpm/100 cm^2 95% of =
> the time." I'd also like</FONT>
> <BR><FONT SIZE=3D2>> to</FONT>
> <BR><FONT SIZE=3D2>> learn about what affect this conversion, e.g., =
> age of fission products,</FONT>
> <BR><FONT SIZE=3D2>> whether</FONT>
> <BR><FONT SIZE=3D2>> it's fission or activation, etc.</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> 2. In the same notice, the airborne =
> radioactivity levels were quoted as</FONT>
> <BR><FONT SIZE=3D2>> "0.8</FONT>
> <BR><FONT SIZE=3D2>> DAC beta and 24 DAC alpha." What =
> would these DACs be? Probably a</FONT>
> <BR><FONT SIZE=3D2>> plant-specific value for the kind of stuff they =
> usually find, but I'd like</FONT>
> <BR><FONT SIZE=3D2>> to</FONT>
> <BR><FONT SIZE=3D2>> know the isotope mix, the assumptions (D, W, Y =
> mix, particle size), etc.,</FONT>
> <BR><FONT SIZE=3D2>> that</FONT>
> <BR><FONT SIZE=3D2>> are used for this kind of DAC. How do you =
> calculate results in DACs? X</FONT>
> <BR><FONT SIZE=3D2>> dpm</FONT>
> <BR><FONT SIZE=3D2>> beta-gamma per m^3 is Y DAC, and Z dpm alpha =
> per m^3 is W DAC?</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> Thanks in advance for your help.</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> - Dan Strom</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> The opinions expressed above are my own, and =
> have not been reviewed or</FONT>
> <BR><FONT SIZE=3D2>> approved</FONT>
> <BR><FONT SIZE=3D2>> by Battelle, the Pacific Northwest National =
> Laboratory, or the U.S.</FONT>
> <BR><FONT SIZE=3D2>> Department</FONT>
> <BR><FONT SIZE=3D2>> of Energy.</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> Daniel J. Strom, Ph.D., CHP</FONT>
> <BR><FONT SIZE=3D2>> Risk Analysis and Health Protection, K3-56, =
> Pacific Northwest National</FONT>
> <BR><FONT SIZE=3D2>> Laboratory</FONT>
> <BR><FONT SIZE=3D2>> Battelle Boulevard, P.O. Box 999, Richland, WA =
> 99352-0999 USA</FONT>
> <BR><FONT SIZE=3D2>> (509) 375-2626 fax: (509) 375-2019 =
> daniel.j.strom@pnl.gov</FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT SIZE=3D2>> =
> ************************************************************************=
> </FONT>
> <BR><FONT SIZE=3D2>> The RADSAFE Frequently Asked Questions list, =
> archives and subscription</FONT>
> <BR><FONT SIZE=3D2>> information can be accessed at <A =
> HREF=3D"http://www.ehs.uiuc.edu/~rad/radsafe.html"; =
> TARGET=3D"_blank">http://www.ehs.uiuc.edu/~rad/radsafe.html</A></FONT>
> <BR><FONT SIZE=3D2>> </FONT>
> <BR><FONT =
> SIZE=3D2>***************************************************************=
> *********</FONT>
> <BR><FONT SIZE=3D2>The RADSAFE Frequently Asked Questions list, =
> archives and subscription</FONT>
> <BR><FONT SIZE=3D2>information can be accessed at <A =
> HREF=3D"http://www.ehs.uiuc.edu/~rad/radsafe.html"; =
> TARGET=3D"_blank">http://www.ehs.uiuc.edu/~rad/radsafe.html</A></FONT>
> </P>
>
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> The RADSAFE Frequently Asked Questions list, archives and subscription
> information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html
>
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html