Ba-133/I-131 calibration procedures

["Samson, Daniel J" <Daniel.Samson@LABOR.STATE.NY.US>]

Greetings radsafe; I'm a first time poster, long time lurker.



Does anyone have any experience using a Barium 133 rod source instead of

Iodine 131 for the calibration of scintillation counting systems used for

thyroid bioassays? Specifically, has anyone ever adjusted the window so that

the correction factor is essentially 1. It seems that due to compton

scattering of the 637 keV photon from Iodine 131, this could theoretically

be done. Are there any disadvantages to doing it this way? Also does anyone

know of any ANSI standards that deal with using Ba-133 as a substitute for

Iodine?



Thanks for your help,

Daniel Samson, CHP

usddps@labor.state.ny.us



************************************************************************

You are currently subscribed to the Radsafe mailing list. To

unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu  Put the

text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,

with no subject line. You can view the Radsafe archives at

http://www.vanderbilt.edu/radsafe/