Making multiple sensitive Detectors

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Hi,

I am simulating a compton camera arrangement and so have two detectors with gamma interactions, (currently set at <1MeV incoming).

I have tried to set the two detectors to be sensitive, which I believe works, but when I output the hit information I find something strange:

--->Hits Collection: in this event there are 0 hits in the detector : BUT SHOWS TWO HITS
  trackID: 1  time: 325.428 ps   SPDetector No: 0  energy dep: 11.067 keV
  trackID: 2  time: 325.492 ps   SPDetector No: 0  energy dep: 134.739 keV

--->Hits Collection: in this event there are 2 hits in the detector : 
  trackID: 1  time: 325.428 ps   SPDetector No: 0  energy dep: 11.067 keV
  trackID: 2  time: 325.492 ps   SPDetector No: 0  energy dep: 134.739 keV

--->Hits Collection: in this event there are 0 hits in the detector : BUT SHOWS TWO HITS
  trackID: 1  time: 162.511 ps   SPDetector No: 0  energy dep: 11.067 keV
  trackID: 2  time: 162.581 ps   SPDetector No: 0  energy dep: 145.671 keV

--->Hits Collection: in this event there are 2 hits in the detector : 
  trackID: 1  time: 162.511 ps   SPDetector No: 0  energy dep: 11.067 keV
  trackID: 2  time: 162.581 ps   SPDetector No: 0  energy dep: 145.671 keV

--->Hits Collection: in this event there are 0 hits in the detector : BUT SHOWS THREE HITS
  trackID: 1  time: 183.959 ps   SPDetector No: 0  energy dep: 129.166 keV
  trackID: 1  time: 205.561 ps   SPDetector No: 0  energy dep: 61.9996 keV
  trackID: 1  time: 208.869 ps   SPDetector No: 0  energy dep: 14.6158 keV

--->Hits Collection: in this event there are 3 hits in the detector : 
  trackID: 1  time: 183.959 ps   SPDetector No: 0  energy dep: 129.166 keV
  trackID: 1  time: 205.561 ps   SPDetector No: 0  energy dep: 61.9996 keV
  trackID: 1  time: 208.869 ps   SPDetector No: 0  energy dep: 14.6158 keV

So I appear to be duplicating the hits collection rather than looking at the detectors independently. I don't understand if this is a problem in my detectorHits file or my sensitivedetector file or if I haven't declared the sensitive detectors correctly:

 G4SDManager *SDman = G4SDManager::GetSDMpointer(); 
  SPDetectorSD* aDetectorSD = new SPDetectorSD( detName[i] );
  SDman->AddNewDetector( aDetectorSD );
  detector_log[i]->SetSensitiveDetector(aDetectorSD);

(within a large looped geometry)

Any advice would be greatly appreciated,

thanks in advance,

Laura

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Making multiple sensitive Detectors - a probelm