RE: Cf-252 neutron rate

[David_S_Hyder@RL.gov]

Dr Hertel,

Thanks for the help.  After doing the calculation, my results came
fairly close to information sent to me by private e-mail that "according
to the manufacturer, the unshielded neutron dose rate at 30 cm is 46
mRem/hr/mCi".  I guess it pays to check the reference material.

David Hyder
Health Physicist
David_S_Hyder@rl.gov
(509) 373-9652
Hanford Facility Evaluation Board



> -----Original Message-----
> From:	nolan Hertel [SMTP:nolan.hertel@me.gatech.edu]
> Sent:	Tuesday, August 03, 1999 11:17 AM
> To:	Multiple recipients of list
> Subject:	Re: Cf-252 neutron rate
> 
> 
> >
> >Rad Health Handbook (black) Table 7.2 lists 1.0 E+6 n/sec-Ci
> 
> The above value must be in error.  Table 7.2 lists ICRU 26 as the
> source of
> the information in the Table.  On p. 54 of ICRU 26, the specific
> neutron
> emission rate of a Cf-252 source is said to be 2.31E06 neutrons per
> microgram per second.  This is consistent with Table 7.9 and other
> references which I have, like ISO 8529 where it is listed as
> 2.4E15n/s/kg.    
> 
> >
> >Rad Health Handbook (black) Table 7.9 lists 2.3 E+12 n/sec-g and 536
> >Ci/g = 4.3 E+9 n/sec-Ci
> >
> >Rad Health Handbook (black) Table 7.5 is confusing but tends to agree
> >with Table 7.9
> >
> >Can anybody out there help me with the "real" neutron emission rate
> of
> >Cf-252? Table 7.2 and 7.9 differ by a factor of >1000
> >
> 
> ********************************************************************
> Nolan E. Hertel, PhD, PE
> Director, Neely Research Center
> Professor of Nuclear Engineering and Health Physics
> G. W. Woodruff School of Mechanical Engineering
> Georgia Institute of Technology
> Atlanta, GA 30332-0425
> (404)894-3601
> facs: (404) 894-9325
> email: nolan.hertel@me.gatech.edu
> www.me.gatech.edu 
> www.nnrc.gatech.edu
> *********************************************************************
> **********************************************************************
> **
> The RADSAFE Frequently Asked Questions list, archives and subscription
> information can be accessed at
> http://www.ehs.uiuc.edu/~rad/radsafe.html
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html