RE: Iodine devolatizer

["Marco Caceci" <mcaceci@radal.com>]

Iodide when oxidized (by oxygen, etc.) to iodine becomes volatile.

Sodium Thiosulphate, in neutral aqueous solution, would destroy oxygen hence

keep the I as iodide. It is cheap, extremely soluble (highly endothermic!)

and hardly toxic at all. Want a number, use 200 g/L stock and add a few

drops per 10-25 mL. Consider aerated water has some 10 mg/L oxygen, you want

to destroy that and any that could get in in time. Beware that Na2S2O3 (sure

hope I got that right!) could react with some organics (aldehydes and

chetones) and acids.

Would not work with I bound (covalently) to organic molecules.

Other reductants (vitamin C...) would also work.

Knowing what status I- is in (solution? with what else?) would help.



Marco







-----Original Message-----

From: owner-radsafe@list.vanderbilt.edu

[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of Engelbretson,

David A.

Sent: 12 December, 2001 15:00

To: 'Radiation Safety Mail'

Subject: Iodine devolatizer





Would anyone have any recipe or reference information for a solution that

would assist in preventing the volatization of iodine-131?  Seems like the

recipe included Sodium Thiosulfate.



Thanks.



Dave





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