Am 13.09.2011 22:47, schrieb Man on Bridges:
Hi,
On 13-9-2011 20:44, Horace Heffner wrote:
<snip calculation of lead shielding>
Hmmm, is there a way to start and stop a gamma radiation source, as it
may be used only to trigger the process?
There is no other way than shielding or increasing the distance.
Rossi could inside use a shield that is moved electrically or by heat
(bimetal).
Or he could control the distance to the gamma source.
If it is a very small point source the /local/ intensity of radiation
could be changed by factor 10^2 or 10^3.
Peter
