correction, re cyclotron shielding

[Les Slaback <lester.slaback@nist.gov>]

The reference to the IAEA report on Rad Safety for Proton Accelerators
should be Report 283, not 285.
Also be aware that Ralph Thomas has submitted a draft revision to NCRP 51
to the NCRP.  I presume that whenever this gets to their peer review
process it will be on their web site.

Disclaimer:  the above are the personal musings of the author, and do not
represent any past, present, or future position of NIST, the U.S. government,
or anyone else who might think that they are in a position of authority. 
Lester Slaback, Jr.  [Lester.Slaback@NIST.GOV] 
NBSR Health Physics 
Center for Neutron Research 
NIST
100 Bureau Dr.  STOP 3543 
Gaithersburg, MD  20899-3543 
301 975-5810 
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