[ RadSafe ] chemical form of industrial irradiation sources

[franz.schoenhofer at chello.at]

Hi Peter,

I have now been again for 3.5 months in Poland and will stay another two months after a four day visit to Vienna right now.
I am very far from being an expert in radiation sources but I use to state that one needs not know everything oneself, but one should know whom to ask and where to find the answers....
You are right, that the Cs-137 in the Goiana accident was soluble CsCl. There are extensive reports to be found by Jose Rozenthal. For Co-60 and Ir-192 it is evident that the metallic state is used for irradiation and neutron activation. However the irradiation sources are 
a l w a y s  encapsulated to make them "umschlossene radioaktive Stoffe" ("encapsulated radioactive material"). There exist international and also Austrian Standards for periodic testing of tightness of the cladding. For the Austrian Standard you may contact the Normeninstitut in Vienna.
The real expert person in Austria would be Gerhard Stolba from Seibersdorf, who was also the leader of the above mentioned working group on the Austrian standard where I have participated. gerhard.stolba at arcs.ac.at. In case you contact him please give him my very best regards. 

Ich wünsche Dir einen schönen Sommer und daß es Dir am JRC genauso gut gefällt wie mir noch immer in Katowice!

Franz


---- Peter Bossew <peter.bossew at jrc.it> schrieb:
> Dear listers:
> 
> Does anybody know in which chemical compound gamma irradiation sources 
> used for material testing, medical use or food irradiation and the like, 
> are usually delivered ? I am particularly interested in 137Cs, 60Co and 
> 192Ir in this context.
> Anything known about solubility in water or eventual reactions with air ?
> Are such sources being used in ceramic compounds ?
> 
> As far as I know the Cs source involved in the Goiânia accident was CsCl 
> as powder.
> 
> Thanks for hints.
> Peter
> 
> 
> 
> -- 
> 
> 
> -----------------------------------------------------
> Peter Bossew 
> 
> European Commission (EC) 
> Joint Research Centre (JRC) 
> Institute for Environment and Sustainability (IES) 
> 
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> 21020 Ispra (VA) 
> ITALY 
>   
> Tel. +39 0332 78 9109 
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> Email: peter.bossew at jrc.it 
> 
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> circumstances be regarded as stating an official position of the European
> Commission."
> 
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