[Gate-users] Specifying the source activity

[Fernando Rannou]

0.0001 Ci is the overall activity in the source (per second)
at the beginning of the experiment. Therefore, the concentration at the
start of the simulation is is 0.0001 Ci /(4/3.PI.(0.5^3)) cc


Fernando

On Mon, 2008-03-31 at 17:47 -0400, KB wrote:
> Hello All,
> 
>      Reading the Gate user manual, it is not clear what the activity
> is: is it the concentration or the total activity?
> 
>     In other words, what exactly am I specifying when the macro file says
> 
> /gate/source/F18HOTSPOT/setActivity 0.0001 Ci
> /gate/source/F18HOTSPOT/gps/type Volume
> /gate/source/F18HOTSPOT/gps/shape Sphere
> /gate/source/F18HOTSPOT/gps/radius 0.5 mm
> 
>    Is that a concentration of 0.0001 Ci/cc or   0.0001 Ci /
> (4/3.PI.(0.5^3)) cc.
> 
>     Thanks.
> 
> 
> KB
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