[ RadSafe ] I-131 Spill Neutralization

[Cormack, John (FMC)]

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
 
AND
 
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.
 
Cheers
 
John
________________________________________________________ 
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
(International) 
Fax:                  (08) 8204 5450 (National) 618 8204 5450
(International)