Re: dose rate from plane source

["Darrell E Harris" <deh42@worldnet.att.net>]

A quick and dirty plane source thumb rule for Co60 energy levels
Reff = effective radius
from contact to .3 Reff dose rate = 3 x
from .3 Reff to .7 Reff dose rate = x
from .7 Reff out use the point source equation

It worked very well in practical use during spills and work on large source
geometries such as tank walls and floors.
----- Original Message -----
From: Michael McNaughton <mcnaught@lanl.gov>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Sent: Tuesday, September 14, 1999 2:20 PM
Subject: dose rate from plane source


> I have not seen a rule of thumb for the dose rate for a plane source, so I
> derived the following simple rule of thumb.
> If E is the average gamma energy per emission in MeV,
> a is the activity in Ci/m^3,
> h is the half-value layer in meters,
> pi = 3.14, and ln(2) = 0.693,
> then the dose rate in R/h = (pi)(E)(a)(h)/ln(2)
>
> I would appreciate any comments.
>
> mike
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