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RE: I-126 in I-125
There shouldn't be much of a problem with the Iodine-126 as an impurity as
it has a half-life of ~13 days.
Edmond J. Baratta
Radiation Safety Officer
Tel. No. 781-729-5700, ext 728
FAX: 781-729-3593
-----Original Message-----
From: Arvic Harms [mailto:Arvic.Harms@npl.co.uk]
Sent: Wednesday, December 17, 2003 4:53 AM
To: 'John R Johnson'; Brian Rees; radsafe Mail list
Subject: RE: I-126 in I-125
Brian and John,
Recently, I was asking myself the same question as Brian. I thought the
I-126 originates from the I-125 (n,g) I-126 process. The cross section
for this reaction is quite high (~900 barns). I guess that if you
irradiate the Xe-124 for a short period of time, then the extent of the
I-126 contamination will be low.
Regards,
Arvic Harms
Dr Arvic Harms
Centre for Acoustics and Ionising Radiation
National Physical Laboratory
Queens Road
Teddington TW11 0LW
Middlesex
United Kingdom
E-mail: arvic.harms@npl.co.uk
Tel ++44 20 8943 8512
Fax ++44 20 8614 0488
> -----Original Message-----
> From: John R Johnson [mailto:idias@interchange.ubc.ca]
> Sent: 17 December 2003 01:02
> To: Brian Rees; radsafe Mail list
> Subject: RE: I-126 in I-125
>
>
> Brian
>
> If the I-125 is produced from the Xe-124( n,g) process there
> should not be
> any I-126 in it. That is the reason that Nordion uses this
> method at their
> or AECL's CRL reactors.
>
> I-125 can also be produced by Sb-123 (alpha, 2n) which will
> also produce
> I-126 from the Sb-123 (alpha,n) reaction.
>
> John
> _________________
> John R Johnson, Ph.D.
> *****
> President, IDIAS, Inc
> 4535 West 9-Th Ave
> Vancouver B. C.
> V6R 2E2
> (604) 222-9840
> idias@interchange.ubc.ca
> *****
> or most mornings
> Consultant in Radiation Protection
> TRIUMF
> 4004 Wesbrook Mall
> Vancouver B. C.
> V6R 2E2
> (604) 222-1047 Ext. 6610
> Fax: (604) 222-7309
> johnsjr@triumf.ca
>
> -----Original Message-----
> From: owner-radsafe@list.vanderbilt.edu
> [mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of Brian Rees
> Sent: December 16, 2003 12:12 PM
> To: radsafe Mail list
> Subject: I-126 in I-125
>
>
> Where would a I-126 impurity arise from in a I-125 source? I
> found one
> ref. that lists the production method of I-125 as a Xe-124
> (n,g), Xe-125,
> then decay of Xe-125 to I-125.
>
> Thanks in advance,
> Brian Rees
>
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