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Forum: Geometry
Re: Question Sensitive Detector (Manoj Kumar Parida)
Date: 11 May, 2015
From: John Apostolakis <John Apostolakis>

Dear Manoj,

Yes, you can have several sensitive volumes.  There is no limit.

Each logical volume can have *one* sensitive detector attached to it.
So, it could have either 
  - a copy (an object or instance) of the same sensitive detector attached to it - e.g. one measuring energy deposition, or
  - an object of a different, specialised sensitive detector which is specific to that volume.

So for example, you could have a tracker which has 10 silicon layers, and each one has a different object of the same type of sensitive detector.
 - Layer_1 => SD_n1  of type TrackerLayerSD
 - Layer_2 => SD_n2  of type TrackerLayerSD
and in the same application a calorimeter with 10,000 cells.  
Each calorimeter cell could be  represented by the same logical volume, meaning that those cells share the same Sensitive Detector object.  In this case the Sensitive Detector class' code would use the geometry information to keep 10,000 tallies of energy deposition, one each for each cell.

High Energy Physics experiments have thousands of volumes declared sensitive.  These use ten or more different types of sensitive detectors.

You can find several examples which have sensitive detectors, and a few which demonstrate two or more.  You can combine sensitive detectors of different types (e.g. from different examples) into one application - or create your own.

Hope this explanation helps,
John Apostolakis,  PH Department, CERN

> On 11 May 2015, at 10:54, Manoj Kumar Parida <> wrote:
> *** Discussion title: Geometry
> Dear All,
> Can we declare more than one logical volume as sensitive region?
> I will be thankful to you if some one helps me.
> Thank You Manoj
> -------------------------------------------------------------
> Visit this GEANT4 at message (to reply or unsubscribe) at: 

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