Re: high energy gammas?

[Dave Brown <david.brown@nist.gov>]

>
>1) 7633 keV (+- ~2.0 keV) with its Single Escape @ 7122 keV and Double
>Escape @ 6611 keV
>2) 7647 keV (+- ~2.0 keV) with SE @ 7136 keV and DE @ 6625 keV
>
>Additionally;
>the following peaks @ ~7864 and 7978 keV were present; these are likely the
>DE ones, however, since the system gain was only up to approximately 8000
>keV. I can not confirm.  If true then the full energy gamma lines would be @
>approximately 8886 and 9000.

Mr. Lieskovský,

I believe what you are seeing may be prompt gamma (n,gamma) photons from, 
Fe, Cr, Ni in the reactor components.  At least the energies coincide.

Fe - 7631 keV   at 28.5 photons/100 neutrons
        7645 keV   at 24.1 photons/100 neutrons

Ni - 8998 keV    at 37.7 photons/200 neutrons

Cr - 8887 keV    at 27 photons/100 neutrons



Regards,

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dave Brown, CHP
National Institute of Standards and Technology
100 Bureau Drive, Stop 3543
Bldg 235 Rm A136
Gaithersburg, MD  20899-3543

301-975-5810 - office
301-921-9847 - fax
david.brown@nist.gov
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*The content of this message has not been endorsed by my employer* 
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html