Re: AW: Xenolite Protective clothing

[garyi@trinityphysics.com]

Hi Sam,



I admit that a brief look at the curves suggests you are right, but I am recalling a study 

sponsored by the FDA about 5 years ago to investigate the safety of lightweight aprons.  

Dr. Ben Archer at Baylor College of Medicine did the study.  I did not see the results on 

paper, but I since I was in the same department I know from his comments that 

composites can be nearly as good as lead (based on direct measurements), and that 

weight reduction was a key benefit for the lighter aprons.



I'm sorry I can't give you any better information than that.   



Have a nice day,

Gary Isenhower



On 3 Dec 2004 at 7:09, Sam Iverstine <sam_iverstine@YAHOO.COM> wrote:



 

> the apparentformula forXenolite, absorption coeficient for Al at 300

> keV is 15 times less than Pb, and 7 times less than Pb at 500 keV;

> therefore at diagnostic ranges (<300 kVp), by extrapolation, Pb (88

> keV, k-edge)becomes an even better absorber for lower energies. Al and

> Si haveabout equal electron densities, k-edges (1.6,1.8 keV), and

> densities. In other words, there appears to be no way around weight

> for absorption properties. 

> 

> Hope this helps the discussion along. 

> 

> Sam

> 



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