[ RadSafe ] I-131 Spill Neutralization

Cormack, John (FMC) John.Cormack at fmc.sa.gov.au
Fri Apr 4 02:26:54 CDT 2008

Hi Folks.
Does anyone out there know the correct formulation for sodium
thiosulphate solution widely recommended for I-131 spill neutralization,
and/or a reference for this? I've seen it variously specified as:
0.1 N sodium thiosulfate + 0.1 N sodium hydroxide ( to bring the pH up)
+ 0.1 N sodium iodide
the same as above , except that 0.01 N sodium hydroxide is specified
rather than 0.1 N.
Sometimes the sodium iodide isn't mentioned , so I'm wondering what
purpose it serves.
I'd be grateful for any information that anybody can give.
John Cormack 
Chief Medical Scientist 
Division of Medical Imaging 
Flinders Medical Centre 
Bedford Park 
South Australia 5042 
Telephone :       (08) 8204 4642 (National) 618 8204 4642
Fax:                  (08) 8204 5450 (National) 618 8204 5450

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