Query: 405.5 KeV gamma from I-131?

[Paul Tyree <mrpmt@empire.net>]

Dear Radsafers:

Please respond [directly] if you have a citeable reference or experience
which affirms that a low entensity (< 0.2%) gamma at 405.5 KeV is
attributable to the I-131 beta mode transformation to Xe-131. This "ROI"
is frequently returned by our gamma spectroscopy system in analysis for
radionuclidic purity of a I-131 radiopharmaceutical. A gamma at 405.5
KeV is a lesser intensity line of I-134 , but the primary lines of that
radionuclide do not present in the 0.05- 2 MeV RNP analysis range.

Thank you for your kind consideration and assistance.

Paul Tyree
CIS-US, Inc.
Paul_Tyree@CIS-US.CCMAIL.CompuServe.COM
also <mrpmt@empire.net>


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