[ RadSafe ] Regulating material activated in a non-medical/research linea...
JPreisig at aol.com
JPreisig at aol.com
Fri Nov 7 15:48:15 CST 2014
Don't know much about the NRC etc. regulations. I suspect activated
materials will be fairly short lived, thereby decaying away fairly
quickly. See Patterson and Thomas's book on Accelerator Health Physics, if one
can even find a copy of this book these days. Also see Cossairt's
Accelerator Health Physics course notes. There is also a book specifically written
about activated materials---the reference is in Patterson and Thomas.
One could probably measure actual radiation "fields" inside
shielding using pieces of plastic, chunks of carbon. plastic scintillators etc.
See Patterson and Thomas.
Once the accelerator is shut off, one can measure activation
radiation using a teletector detector and make measurements as a function of time.
Perhaps one could also place one or more radiation detectors into the
shielded area, and start to turn on the detectors once the accelerator is
turned off. You would probably need a power cable and an electronics cable
which would bring the counting results to a person or computer/MCA outside of
One might also activate pieces of plastic inside the shielding, and
perhaps have the plastic pieces attached to strings and the plastic pieces
could be dragged out of the shielded area and counted. BE CAREFUL ---
activated plastic, carbon chunks, plastic scintillators may be hot,
If one is using a plastic scintillator to find neutron flux densities from
20 MeV to 400 MeV or so (an n.2n reaction) the plastic scintillator should
be placed in a shielded container while being transported to the counting
Perhaps someone else on Radsafe can tell you about the relevant NRC
In a message dated 11/7/2014 4:20:47 P.M. Eastern Standard Time,
mary.donahue.2 at us.af.mil writes:
What is the NRC policy/regulation on material that becomes activated as a
result of the nuclear interactions from a nonmedical/research linear
accelerator? The material is not meant to be used or distributed for its
radiological properties. This is on a federal facility so not concerned about
agreement state regulations on NARM. I have seen some NUREGs but they are
several years old.
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