[ RadSafe ] Request for Assistance

[Doug Aitken]

Wireline logging companies were using Cs137 sources (generally with activity of under 75 GBq) for subsurface density logging (in oil/gas/mineral exploration wells) since the late  '50s. The first sources used (from 3M) used (soluble) Cesium chloride encapsulated in ceramic microspheres (obviously encapsulated in (2 or 3 levels of) steel encapsulation. These could have created pretty nasty contamination if ruptured and I believe the last of these were removed from service in the "80s, replaced for "solid" sources with the active material fused into ceramic material. 

Regards
Doug
___________________________________________________________________________________
Doug Aitken
QHSE Advisor, Schlumberger D&M Operations Support
Cell Phone: 713-562-8585
(alternate e-mail: doug.aitken at slb.com )
Mail:
Schlumberger, Drilling & Measurements HQ,
300 Schlumberger Drive, MD15,
Sugar Land, Texas 77478



-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Dahlskog, Leif
Sent: Wednesday, July 03, 2013 12:02 AM
To: The International Radiation Protection (Health Physics) MailingList
Subject: Re: [ RadSafe ] Request for Assistance

The Cs-137 sources used by industrial radiographers these days are only for pipeline crawler control, aren't that big and I believe are no longer as salt crystals.  I don't recall Cs-137 sources being used for industrial radiography imaging in the 1980's.  Perhaps 'bigger' Cs-137 sources were used in the earlier days of industrial radiography before other radioisotopes emerged with better imaging properties.  

Leif Dahlskog
Senior Health Physicist
Radiation Health Branch 


-----Original Message-----
From: radsafe-bounces at agni.phys.iit.edu
[mailto:radsafe-bounces at agni.phys.iit.edu] On Behalf Of Jeremy Nicoll
Sent: Wednesday, 3 July 2013 12:31 PM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Request for Assistance

<Of course robbing an industrial radiographer would get you a bigger
Cs-137 source and would probably be an easier exercise.>

Jeremy
________________________________
From: Otto G. Raabe
Sent: 3/07/2013 11:26 a.m.
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Request for Assistance


>July 2,  2013

My questions is what radionuclides would the Nuclear Medicine Department in a British hospital in 1983 that would be suitable for contaminating a deactivated air base so the USAF cannot deploy a new nuclear missile weapon system there?

Otto

**********************************************
Prof. Otto G. Raabe, Ph.D., CHP
Center for Health & the Environment
University of California
One Shields Avenue
Davis, CA 95616
E-Mail: ograabe at ucdavis.edu
Phone: (530) 752-7754   FAX: (530) 758-6140
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