Re: LNT and resources [Was: Scientific responsibility]

["Gary Isenhower" <garyi@trinityphysics.com>]

John,



I should also mention that your c-arm had the benefit of a roughly 50% 

attenuation due to gypsum, but a 511 photon dose is higher on the 

other side of such a wall due to buildup.



About taking credit for the concrete slab.  Typical construction is about 

3" low density concrete poured over a 1 mm corrugated steel pan.  For 

PET isotopes, there is not much credit to be had there.  It takes 

roughly 10x as much regular density concrete as it does Pb to produce 

a given attenuation for 511 keV.



-Gary Isenhower



Date sent:      	Fri, 20 Jun 2003 10:01:52 -0700 (PDT)

From:           	John Jacobus <crispy_bird@yahoo.com>

Subject:        	Re: LNT and resources [Was: Scientific 

responsibility]

To:             	Gary Isenhower <garyi@trinityphysics.com>, 

radsafe@list.vanderbilt.edu



> Gary,

> Shielding is certainly reasonable problem for a small

> scale operation.  At our place, I did a shielding

> evaluation of a new C-Arm, and recommended only 1/32"

> lead of one wall.  The comment was, "Well, we can

> order and use 1/16" all around."  The difference in

> price was too small to worry about.  

> 

> By the way, I assume you were not taking "credit" for

> the concrete slab between the floors.



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