Although I-123 has a 14 hour half-life, it is not uncommon to have I-121 "contamination" present. I-121 beta decays (2.2 hour half-life) to Te-121 which has a 16.8 day half-life. Since this medical treatment was done a month ago that I would expect that at this time all you would see is the Te-121
From: [email protected] [mailto:[email protected]] On Behalf Of Mathiasen, Glenn D. Sent: Tuesday, November 06, 2012 5:30 AM To: '[email protected]' Subject: Powernet: RE: Te-121 on a whole body count, medical or something else? Stephen, A quick Google search indicates that Te-121 is expected in the Sodium Iodide I-123, no explanation of why it's there. ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Holmes, Stephen J Sent: Monday, November 05, 2012 11:06 PM To: '[email protected]' Subject: Powernet: Te-121 on a whole body count, medical or something else? We recently had an individual, arriving on site for our outage, alarm our entrance portal monitors. We whole body counted him and identified peaks at 507.4 and 573.2 keV. We determined Te-121 to be the likely suspect. The individual said he had a medical treatment about a month before and had been administered I-123. This seems to be the likely source, but I don't understand how an I-123 medical treatment would result in Te-121. Can anyone explain to me where the Te-121 would have come from? Is there another nuclide which would give us these peaks? Thanks, Stephen J Holmes Sr. Plant Health Physicist, CENG-RE Ginna NPP [email protected] 585-771-3577 >>> This e-mail and any attachments are confidential, may contain legal, >>> professional or other privileged information, and are intended solely for >>> the addressee. If you are not the intended recipient, do not use the >>> information in this e-mail in any way, delete this e-mail and notify the >>> sender. -IP1 --- NOTICE --- This message is for the designated recipient only and may contain confidential, privileged or proprietary information. If you have received it in error, please notify the sender immediately and delete the original and any copy or printout. Unintended recipients are prohibited from making any other use of this e-mail. Although we have taken reasonable precautions to ensure no viruses are present in this e-mail, we accept no liability for any loss or damage arising from the use of this e-mail or attachments, or for any delay or errors or omissions in the contents which result from e-mail transmission.
