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Re: DCGL Values and ALARA

To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>, "Johannes Strydom" <fritz.strydom@ors.gatech.edu>
Subject: Re: DCGL Values and ALARA
From: steve.rima@DOEGJPO.COM (Steven Rima)
Date: Fri, 17 Sep 1999 13:44:45 -0600
Return-receipt-to: steve.rima@DOEGJPO.COM (Steven Rima)
     Johannes,
     
     I am not aware of any "generic" list such as you ask for. In order to 
     derive a DCGL for a specific property, you must model that specific 
     property including isotopes, future use scenarios, etc., using RESRAD 
     or a similar code. We've done this successfully but be aware that it's 
     not an easy and cheap process. BTW, MARSSIM does not specify release 
     limits or tell you anything about how to come up with them. MARSSIM 
     takes over _after_ you have determined the DCGL; it then tells you how 
     to design and carry out a successful survey. If you have any questions 
     on the DCGL derivation process and/or MARSSIM survey methodology, give 
     me a call.
     
     Steven D. Rima, CHP, CSP
     Manager, Health Physics and Industrial Hygiene
     MACTEC-ERS, LLC
     steve.rima@doegjpo.com
     970-248-6787


______________________________ Reply Separator _________________________________
Subject: DCGL Values and ALARA
Author:  "Johannes Strydom" <fritz.strydom@ors.gatech.edu> at Internet
Date:    9/17/99 2:01 PM


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Radsafers,
     
As many of you may be aware, we are in the process of decommissioning our 
research reactor here at Georgia Tech.  We are decommissioning to Reg Guide 
1.86 levels (Not MARSIMM).
     
We are trying to find a method by which we can determine in what areas our 
money would best be spent to perform further decontamination after 1.86 
levels have been met.  The NRC put out a working Reg guide on ALARA Analysis 
that outlines a method to perform a determination on when further 
decontamination would be economically reasonable.  In order to use their 
equations, it is necessary to have DCGL values for both surface 
contamination and volumetric contamination.
     
The DCGL is the average concentration of residual activity that would give a 
dose of 25 mrem/yr to the average member of the population in units of 
activity per unit area for buildings or activity per unit volume for soils.
     
Does anyone know of a place where (or has someone calculated) I can get 
generic DCGL (Derived Concentration Guideline) values for common 
radionuclides in such things as concrete, building surface contamination, 
soil, etc for a building that is decommissioned to free release.  From what 
I have read, it seems that to get these numbers, an analysis using software 
such as Resrad needs to be done.  We can certainly do this if necessary, but 
I was wondering if there was a generic table somewhere?
     
Thank you.
     
------------------------------------------------ 
Johannes "Fritz" Strydom
Health Physicist
Georgia Institute of Technology
(404) 894-3605
(404) 894-9325 fax
fritz.strydom@ors.gatech.edu <mailto:fritz.strydom@ors.gatech.edu>
     
     
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<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'>Radsafers,<o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'><![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'>As many of you may be aware, we are in the process of = 
decommissioning
our research reactor here at Georgia Tech.<span style=3D"mso-spacerun: = 
yes">=A0
</span>We are decommissioning to Reg Guide 1.86 levels (Not = 
MARSIMM).<o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'><![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'>We are trying to find a method by which we can determine in what = 
areas our
money would best be spent to perform further decontamination after 1.86 = 
levels
have been met.<span style=3D"mso-spacerun: yes">=A0 </span>The NRC put = 
out a
working Reg guide on ALARA Analysis that outlines a method to perform a 
determination on when further decontamination would be economically = 
reasonable.<span
style=3D"mso-spacerun: yes">=A0 </span>In order to use their equations, = 
it is
necessary to have DCGL values for both surface contamination and = 
volumetric
contamination.<o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'><![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'>The DCGL is the average concentration of residual activity that = 
would
give a dose of 25 mrem/yr to the average member of the population in = 
units of
activity per unit area for buildings or activity per unit volume for = 
soils.<o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'><![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'>Does anyone know of a place where (or has someone calculated) I = 
can get
generic DCGL (Derived Concentration Guideline) values for common = 
radionuclides
in such things as concrete, building surface contamination, soil, etc = 
for a
building that is decommissioned to free release.<span = 
style=3D"mso-spacerun:
yes">=A0 </span>From what I have read, it seems that to get these = 
numbers, an
analysis using software such as Resrad needs to be done.<span 
style=3D"mso-spacerun: yes">=A0 </span>We can certainly do this if = 
necessary, but I
was wondering if there was a generic table = 
somewhere?<o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'><![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
Arial'>Thank you.<o:p></o:p></span></font></span></p>
     
<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 = 
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family: 
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ont
color=3Dblack><span =
style=3D'color:black'>------------------------------------------------</s= 
pan></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font><= 
/p>
     
<p class=3DMsoAutoSig><font size=3D3 color=3Dblack face=3D"Times New = 
Roman"><span
style=3D'font-size:12.0pt;color:black'>Johannes &quot;Fritz&quot; = 
Strydom</span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font><= 
/p>
     
<p class=3DMsoAutoSig><font size=3D3 color=3Dblack face=3D"Times New = 
Roman"><span
style=3D'font-size:12.0pt;color:black'>Health = 
Physicist</span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font><= 
/p>
     
<p class=3DMsoAutoSig><font size=3D3 color=3Dblack face=3D"Times New = 
Roman"><span
style=3D'font-size:12.0pt;color:black'>Georgia Institute of = 
Technology</span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font><= 
/p>
     
<p class=3DMsoAutoSig><font size=3D3 color=3Dblack face=3D"Times New = 
Roman"><span
style=3D'font-size:12.0pt;color:black'>(404) 894-3605</span></font><font 
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font><= 
/p>
     
<p class=3DMsoAutoSig><font size=3D3 color=3Dblack face=3D"Times New = 
Roman"><span
style=3D'font-size:12.0pt;color:black'>(404) 894-9325 = 
fax</span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font><= 
/p>
     
<p class=3DMsoAutoSig><font size=3D3 color=3Dblack face=3D"Times New = 
Roman"><span
style=3D'font-size:12.0pt;color:black'><a 
href=3D"mailto:fritz.strydom@ors.gatech.edu";>fritz.strydom@ors.gatech.edu= 
</a></span></font><font
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