[ RadSafe ] Subsurface Gamma Spec Detector

Tue Jul 19 12:13:38 CDT 2011

Hi, Dan!
I was waiting for you to chime in!

You are right that most current downhole tools rely on NaI (and a few with
BGO). HPGe is, of course, really nice due to its high discrimination, but
the temperature limitation makes it a bit of a PITA for downhole
applications (at least for the deep boreholes of the O&G industry).

The "new kid on the block" is LaBr3 (Ce), which gives a better spectrum than
the NaI and none of the temp problems of HPGe. Download some info here:
http://www.ortec-online.com/download.asbx?AttributeFileId=e0a47196-05ea-4e35
-a5a7-7ab39c66f6e1&x230=page=1

I don't know if Ortec are already selling these, but it might be interesting
to contact them!
http://www.ortec-online.com/Contact/index.aspx

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: c/o Therese Wigzell,
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 Dan W McCarn
Sent: Tuesday, July 19, 2011 11:47 AM
To: 'The International Radiation Protection (Health Physics) MailingList'
Subject: Re: [ RadSafe ] Subsurface Gamma Spec Detector

Hi Dustin & Doug:

I assume all the systems that you have looked at are based on NaI(Tl)
spectrometry systems.  There was a guy up in Wyoming that developed a HPGe
system that used a "Coldfinger" to maintain cryogenic temperatures for
borehole logging for uranium. 

What is your objective for borehole logging? Are you looking for something
besides K-U-T systems e.g. radionuclides other than the uranium & thorium
decay chains?

Dan ii

--
Dan W McCarn, Geologist
108 Sherwood Blvd
Los Alamos, NM 87544-3425
+1-505-672-2014 (Home - New Mexico)
+1-505-670-8123 (Mobile - New Mexico)
HotGreenChile at gmail.com (Private email) HotGreenChile at gmail dot com

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Doug Aitken
Sent: Tuesday, July 19, 2011 10:24
To: 'The International Radiation Protection (Health Physics) Mailing List'
Subject: Re: [ RadSafe ] Subsurface Gamma Spec Detector

Joe: you are correct that EMR (now Schlumberger's Princeton Technology
Center) makes these detectors, but these are generally only for
Schlumberger's internal use. And many of the integrated detectors use
commercial crystals from Bicron/St Gobain.

They can be contacted in the States at:
Saint-gobain Crystals
17900 Great Lakes Parkway
Hiram, OH 44234
Tel: (440) 834-5600

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: c/o Therese Wigzell,
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 JPreisig at aol.com
Sent: Tuesday, July 19, 2011 11:00 AM
To: radsafe at health.phys.iit.edu
Subject: Re: [ RadSafe ] Subsurface Gamma Spec Detector

Hi,

     _jpreisig at aol.com_ (mailto:jpreisig at aol.com) 

     This is expensive and probably a bit too much  technology for your
project, but EMR Photoelectric/Schlumberger Technologies makes gamma
detectors  for oil well logging.  These gamma detectors are mechanically and
thermally stable and might fit in your  geoprobe borehole.  Such a gamma
detector used to cost  $2K (1978 dollars).
Don't know what they go for now.

      Their address is:   44 Wallace  Road, Princeton Junction, New Jersey

      I expect EMR Photoelectric/Schlumberger  Technologies has a website.  
Google it.

      Such a detector would work well with a  portable MultiChannel Analyzer
and PC.

      Perhaps one could even power such a system  in the field with a
portable AC electricity
      generator.

      Have fun.

      Joe Preisig

In a message dated 7/18/2011 10:41:32 P.M. Eastern Daylight Time,
dgmiller at enercon.com writes:

My  internet search skills are failing me today.  Does anyone know where  to
rent or purchase a gamma spec unit with a detector that has  dimensions
capable of logging a geoprobe boring?  I have found the  detector in the
link below, but I don't know where to purchase and/or  rent.

http://www.detectors.saint-gobain.com/SlimLine.aspx  

Thank you,

Dustin G. Miller

RSO/Health  Physicist

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