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RE: gamma shielding factor for residential dose calculations
Henry,
The Table F4 of IAEA-TECDOC-955, pg.121 gives shielding factors for surface
deposition. The table itself is referenced to be from "Structures Shielding
from Cloud and Fallout Gamma-ray Sources for Assessing the Consequence of
Reactor Accidents, Burson, E.G., EGG-1183-1670, 1975.
Hope this helps a little.
Miro.
-----Original Message-----
From: Henry Wood [mailto:thenry@viperlink.net]
Sent: Friday, March 03, 2000 10:25 AM
To: Multiple recipients of list
Subject: gamma shielding factor for residential dose calculations
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This question relates to assessing external dose from radionuclides in =
soil for residential or recreational land use scenarios.
Can someone offer clarification about the appropriate application of the =
gamma shielding factor. EPA RAGs Part B suggest using a default factor =
of 0.2 due to shielding from structures. NUREG/CR-5512 equations are =
segregated into time spent indoors (with an indoor shielding factor) and =
outdoors (outdoor shielding factor assumed as no shielding).
When an individual is outdoors, should one always assume "no shielding"? =
Don't other issues such as soil moisture, vegetative cover (forested =
versus non-forested), and topography come into play when determining the =
actual amount of shielding? Is there a particular reference that =
expounds upon this issue?=20
Thanks you for comments/direction
Henry Wood=20
Thomas Henry Wood
Blue Ridge Environmental Consulting, Inc.
600 Highway 25 North
Travelers Rest, SC 29690
864-834-5513
thenry@viperlink.net
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<DIV><FONT face=3DArial size=3D2>This question relates to =
assessing external=20
dose from radionuclides in soil for residential or recreational =
land use=20
scenarios.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Can someone offer clarification about =
the=20
appropriate application of the gamma shielding factor. EPA RAGs =
Part B=20
suggest using a default factor of 0.2 due to shielding from =
structures. =20
NUREG/CR-5512 equations are segregated into time spent indoors (with an =
indoor=20
shielding factor) and outdoors (outdoor shielding factor assumed as no=20
shielding).</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>When an individual is outdoors, should =
one always=20
assume "no shielding"? Don't other issues such as soil =
moisture,=20
vegetative cover (forested versus non-forested), and topography come =
into play=20
when determining the actual amount of shielding? Is there=20
a particular reference that expounds upon this =
issue? </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Thanks you for =
comments/direction</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Henry Wood</FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Thomas Henry Wood<BR>Blue Ridge =
Environmental=20
Consulting, Inc.<BR>600 Highway 25 North<BR>Travelers Rest, SC =20
29690<BR>864-834-5513<BR><A=20
href=3D"mailto:thenry@viperlink.net";>thenry@viperlink.net</A></FONT></DIV=
></BODY></HTML>
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