[ RadSafe ] Excess relative risk

howard long hflong at pacbell.net
Thu Jan 17 13:50:17 CST 2008

Yes, a radiation risk formula without hormesis, 
is like global climate models omitting water vapor (>10x the effect of CO2).. 
Ignorant or deceptive.

Howard Long

----- Original Message ----
From: Otto G. Raabe <ograabe at ucdavis.edu>
To: howard long <hflong at pacbell.net>; radsafe at radlab.nl
Sent: Wednesday, January 16, 2008 8:49:05 AM
Subject: Re: [ RadSafe ] Excess relative risk

At 09:13 AM 1/12/2008, howard long wrote:

What would make clear in that formula that kD is 
a NEGATIVE excess relative risk when radiation exposure is under ~20cGy (rad), rapid rate,  
i.e. hormesis?  +-kD?

January 16, 2008

The linear model formula forces you to accept the structural hypothesis that risk is a linear function of dose with a fixed coefficient that is independent of dose (in this case k) from zero dose to some upper dose limit. So you cannot use this formula if the risk is negative over some lower dose range and positive over some higher dose range.  


----- Original Message ----
From: Otto G. Raabe <ograabe at ucdavis.edu>
To: radsafe at radlab.nl
Sent: Friday, January 11, 2008 12:11:10 PM
Subject: [ RadSafe ] Excess relative risk

January 11, 2008

If R=R(0)[1+kD] then the excess relative risk is kD.

Excess relative risk is {R-R(0)}/R(0) = {R(0)[1+kD]-R(0)}/R(0) =kD

Prof. Otto G. Raabe, Ph.D., CHP
Center for Health & the Environment
University of California
One Shields Avenue
Davis, CA 95616
E-Mail: ograabe at ucdavis.edu
Phone: (530) 752-7754   FAX: (530) 758-6140

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