[ RadSafe ] chemical form of industrial irradiation sources
jdaitken at sugar-land.oilfield.slb.com
Mon Jun 30 09:41:26 CDT 2008
Peter: I cannot reply regarding the types of sources you mention. However,
all Cs137 sources we use for sub-surface measurements in oil wells are of
Cesium chloride contained in an insoluble, ceramic matrix,
triple-encapsulated in MP-35 alloy.
Some very old Cs137 sources had the cesium chloride encapsulated in glass
microspheres (a 3-m process, I believe). However, the danger of these
microspheres being broken (for instance, in a downhole incident where the
steel encapsulation was breached) and the (soluble) cesium chloride released
caused the US government to ban there use in downhole applications.
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Peter Bossew
Sent: Monday, June 30, 2008 5:12 AM
To: radsafe at radlab.nl
Cc: Marc De Cort
Subject: [ RadSafe ] chemical form of industrial irradiation sources
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
Thanks for hints.
European Commission (EC)
Joint Research Centre (JRC)
Institute for Environment and Sustainability (IES)
TP 441, Via Fermi 1
21020 Ispra (VA)
Tel. +39 0332 78 9109
Fax. +39 0332 78 5466
Email: peter.bossew at jrc.it
"The views expressed are purely those of the writer and may not in any
circumstances be regarded as stating an official position of the European
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