RE: dose rate from plane source

["Lavera, Ron" <Ron.Lavera@nypa.gov>]

See Herman Cember Introduction to Health Physics 3rd Edition page 423.

H=pi x G x C x ln[ (R^2+D^2)/D^2]  

H= R/h
G= gamma constant (R m^2)/(Ci h)
C=Ci/m^2
D=Distance from plane source



Good Luck

Ron LaVera
Lavera.r@nypa.gov

		-----Original Message-----
		From:	Michael McNaughton [mailto:mcnaught@lanl.gov]
		Sent:	Tuesday, September 14, 1999 2:21 PM
		To:	Multiple recipients of list
		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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