Re: Am-Be source

["Mike Malaxos" <rss@arach.net.au>]

Radsafers,

How about gamma by Neutron Capture in the Am241 and the stainless steel
encapsulation.

Equivilent dose rates at 1000 mm from a 50 mCi (1.85 GBq) Am 241 Be source 
Ref Amersham Catalogue is 1.2 microSv/h Neutron and 1 microSv/h gamma.
How significant is the dose rate of the higher energy gamma compared to the
low energy (approx 60 keV) emmitted from the Am 241?  



Best Regards
M.Malaxos
Radiation Safety Services
69-71 Robinson Avenue Belmont
Western Australia.  6104 
Fax 61 89 475 0165
P 61 89 475 0099  a/h 089 255 1214
email rss@arach.net.au
 

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> From: Ninni Jacob <njacob@gsosun1.gso.uri.edu>
> To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
> Subject: Re: Am-Be source
> Date: Saturday, 24 January 1998 3:26
> 
> 
> 
> 
> > Date: Fri, 23 Jan 1998 08:43:52 -0600 (CST)
> > From: Mike McNaughton <mcnaught@lanl.gov>
> > Reply-To: radsafe@romulus.ehs.uiuc.edu
> > To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
> > Subject: Re: Am-Be source
> > 
> > In addition to the gammas from Am, there is also a 4.4 MeV gamma from
> > carbon-12. Alpha plus Be-9 goes to carbon-12 + neutron. The carbon-12
emits
> > a 4.4 MeV gamma.
> > 
> 
> 
> Mike:
> Carbon-12 does not emit a gamma, unless you mean the excited state of
> Carbon-13.
> But I dont think there is a gamma ray associated with that reaction.
> I think the 4.4 MeV is divided between the neutron and the recoil
nucleus.
> (see Page 123 and 124 of Cember).
>  
> 
> Ninni Jacob