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Re: HVL of water for Ir-192 ?



I worked up some stuff for you to look at, since Ir-192 has several
different gamma emissions, the half value layer changes as the beam is
hardened (as more of the lower energy photons are attenuated.  15 cm is
reasonable and slighly conservative.  I attached a spreadsheet of dose rate
calcs for different (water) shield thickness at 100 cm from a 1 curie
source.  Enjoy!

Tom O'Dou
tom_dixie@msn.com

-----Original Message-----
From: Dahlskog, Leif <Leif.Dahlskog@health.wa.gov.au>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Date: Thursday, April 02, 1998 8:22 PM
Subject: HVL of water for Ir-192 ?


>I have been told the half value layer of normal tap water for Ir-192 is
>approx. 15 cm (6 inches).
>
>As this may have been a guesstimate, can someone confirm the value or
>provide a correct value with  a reference.
>
>regards
>
>Leif Dahlskog
>Scientific Officer
>Radiation Health Section
>Health Department of Western Australia


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end