[ RadSafe ] Subsurface Gamma Spec Detector

Tue Jul 19 11:52:18 CDT 2011

Doug and Radsafe,

      Hmmmmm.  Not all EMR tubes are internal  use only.  Back in the day, 
I remember the
Engineers and/or Technicians used to SELECT some of the better EMR  
photodetectors, and direct
them to Santa Barbara (Hughes Corporation???) California.  They used  to 
call them the Santa
Barbara tubes and they were always very pleased when sent one out.   
Perhaps they were used
in satellites or other industry well logging.  My Minitrons (a neutron  
generator tube) cost $5K
back then (1978 dollars).  My friend Jerome (an electronics  technician) 
dropped one Minitron
tube (that had tested well and was ready to be shipped!!!!) on the ground  
and because of the glass
used in the Minitron back then, the tube broke into many pieces.  A  dumb 
kid production engineer
named Joe Preisig was called in to clean up the mess.  Fortunately the  
tritium is absorbed 
into the tube storage filament(s), so the mess wasn't too bad.

      I think Minitrons have ceramic  envelopes(instead of glass) these 
days.  Joanie, a QC technician
commonly referred to Minitrons as Bit__itrons.  What a cool tube to  build 
and work on.

     Regards,   Joseph R. (Joe) Preisig,  PhD

In a message dated 7/19/2011 12:24:57 P.M. Eastern Daylight Time,  
jdaitken at sugar-land.oilfield.slb.com writes:

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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