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Re: NASA Re-entry (2)



Sorry folks,

Looks like I may have jumped the gun.  The instrument "EGRET" developed
here at Goddard did not have any check sources, but it appears the other
instruments did have some.  Details will probably be released by NASA Hq.


At 08:36 AM 10/5/98 -0500, you wrote:
>RADSAFERs,
>
>After speaking with one of the principal investigators at Goddard, he
>informed me that there are no radioactive check sources aboard the CGRO.
>
>He recalled that background radiation was a problem in developing the EGRET
>instrument and that a small amount of Potassium-40 (naturally occuring
>isotpe) was detected in one of the ceramic coatings after manufacture.  
>
>The detectors onboard are mainly sodium iodide and "detect" high energy
>photons.  
>
>I hope this tidbit helps a wee bit.
>
>
>At 08:56 PM 10/4/98 -0500, you wrote:
>>A posting by an anti nuclear group says that NASA is planning to
>>bring the C. G. R. O. (Gamma Ray Observatory) back to earth in
>>a controlled re-entry.  The gamma ray detectors are said (by the
>>anti-nukes) to be highly radioactive.
>>
>>Sopurces at Godard Space Flight Center for High Energy
>>Astrophysics in Greenbelt Md are mentioned as is the Energetic
>>Gamma Ray Experiment Telescope (EGRET).
>>
>>Can any RADSAFER shed light on what kind of gamma ray detector
>>may be highly radioactive?
>>
>>Mayber they think that a detector that absorbes gamma rays
>>becomes radioactive.
>>
>>Jesse Coleman
>>RADSHOALS@AIRNET.NET
>>************************************************************************
>>The RADSAFE Frequently Asked Questions list, archives and subscription
>>information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html
>>
>>
>************************** /^\   /^\ ***********************************
>Tad  Blanchard            /__ \ /___\   NASA-Goddard Space Flight Center
>Parallax, Inc                  O         Code 205.9, Greenbelt, MD 20771
>Sr Health Physics Tech        / \                    Phone: 301-286-9157
>Assistant RSO                /___\                   Fax:   301-286-1618
>                 mailto:Tad.M.Blanchard.1@GSFC.NASA.gov
>    http://gsfc-aphrodite.gsfc.nasa.gov/205/205-2/Health/RADPROT.HTM
>************************************************************************
>************************************************************************
>The RADSAFE Frequently Asked Questions list, archives and subscription
>information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html
>
>
************************** /^\   /^\ ***********************************
Tad  Blanchard            /__ \ /___\   NASA-Goddard Space Flight Center
Parallax, Inc                  O         Code 205.9, Greenbelt, MD 20771
Sr Health Physics Tech        / \                    Phone: 301-286-9157
Assistant RSO                /___\                   Fax:   301-286-1618
                 mailto:Tad.M.Blanchard.1@GSFC.NASA.gov
    http://gsfc-aphrodite.gsfc.nasa.gov/205/205-2/Health/RADPROT.HTM
************************************************************************
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html