Re: HVL for Xe-133

[gfeldman@uci.edu (Gerald Feldman)]

Peter Fundarek wrote:

>Would anyone out there in radsafer land have information on 
>the HVL in lead for Xe-133?  I have seen two values, 0.2 mm 
>Pb and 0.8 mm Pb.  Based on its decay energies (similar to 
>I-125) I would have expected something thinner at about the 
>same as I-125, 0.02 mm Pb.  
>
>Any assistance would be appreciated.
>
>*************************************
>Regards,
>Peter J. Fundarek
>University of Toronto
>email:  p.fundarek@utoronto.ca
>phone:  (416) 978-2374
>fax:  (416) 971-1384
>
>Standard Disclaimer:
>
>The opinions and thoughts expressed
>in this message are those of the 
>author and not necessarily those
>of the University of Toronto
>*************************************
>
>
>
>
>
Peter:

The Xe-133 Drug Data Sheet from Medi Nuclear Corporation shows the following:

     Radiation           Mean % Per               Mean Energy
                         Distintegration          (kEv)

     Beta-2              99.3                     100.6
     Gamma-2             34.99                     81.0
     K-electrons -2      47.24                     45.0
     L-electrons -2       7.84                     75.7
     M-electrons -2       9.84                     80.0    
     K X-rays            34.70                     30.8
     K X-rays             7.67                     35.2


     The specific gamma ray constant for 133 Xenon is 0.52 R/mCi at 1 cm.
     The half-value layer is 0.4 mm of lead.


Hope this helps.
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  Gerald Feldman, M.S.
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