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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?
Thanks you for comments/direction
Henry Wood
Thomas Henry Wood
Blue Ridge Environmental Consulting, Inc. 600 Highway 25 North Travelers Rest, SC 29690 864-834-5513 thenry@viperlink.net |