Re: Risk with Am241/Be source? - Addendum

["Björn Cedervall" <bjorn_cedervall@hotmail.com>]

It can be assumed that the medium between the source and target is air.

Bjorn Cedervall
------------------------------------------------------------------
>Date: Sun, 10 May 1998 13:50:24 -0500 (CDT)
>From: "Björn Cedervall" <bjorn_cedervall@hotmail.com>
>To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
>Subject: Risk with Am241/Be source?
>
>Radsafers,
>
>A friend of mine recently asked about the potential radiation risks 
with 
>Americium (241)-Beryllium neutron generators. The probe device is used 
>for measuring moisture and density in soil etc. The probe contains 30 
>mCi 241-Am/Beryllium (the half-life of 241-Am is about 458 y) as well 
as 
>1 mCi cesium 137. The neutron yield can probably be taken as (??) 
>2.5x10E6 neutrons/(second,Ci).
>
>
>
>The question is what the radiation exposure (neutrons and gamma, what 
>would the energies of the neutrons and gamma components be?, weighted 
>whole body mSv/h?) whould amount to if the probe is taken out of its 
>protective shield (which I understand has to be done in order to 
perform 
>certain types of calibration measurements). Reasonable assumptions are 
>that the person in question - "the point target?" will stand 1 meter 
(m) 
>from the probe which can be considered as a point source.
>
>
>
>Many thanks in advance,
>
>
>
>Bjorn Cedervall,
>
>PhD (Karolinska Institutet)
>
>Fax: Int + 46 8 33 64 14
>
>email: bjorn_cedervall@hotmail.com
>
>______________________________________________________
>Get Your Private, Free Email at http://www.hotmail.com
>


______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com