Re: Rad Silicon

[LIPTONW@detroitedison.com]

You wrote:  
 
Good morning from soggy California. 
 
Some time ago there was some discussion about "rads silicon" vs. "rads 
air". I did a search in the Radsafe archives, but didn't get good 
results. Do any of you know what "rads silicon" is and the conversion 
factor from silicon to air? Is it the ratio of the mu/rhos? 
 
Thanks for your help, and send us some sunshine, please! I was going to 
buy a house on a hillside, but I just let it slide. 
 
 
Donald P. Mercado 
Radiation Safety Officer 
Lockheed Martin Missiles & Space 
O/47-20, B/101 
1111 Lockheed Martin Way 
Sunnyvale, CA 94089 
 
For photons, the ratio of silicon dose to air dose would be the ratio of the 
mass energy absorption coefficients (mu-en/rho)silicon / (u-en/rho)air.  For
1 
MeV photons, this ratio is  0.0277 cm2/g / 0.0278 cm2/g ~ 1.0  (Appendix D3, 
Attix, ("Introduction to Radiological Physics and Radiation Dosimetry",
Wiley 
1986).   
 
 
The opinions expressed are strictly mine. 
It's not about dose, it's about trust. 
 
Bill Lipton 
liptonw@detroitedison.com