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diff --git a/src/G4BeamTestUserTrackingAction.cxx b/src/G4BeamTestUserTrackingAction.cxx
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+++ b/src/G4BeamTestUserTrackingAction.cxx
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+/**
+ * Copyright (C) 2011
+ * The IceCube collaboration
+ * ID: $Id$
+ *
+ * @file G4BeamTestUserTrackingAction.cxx
+ * @version $Revision$
+ * @date $Date$
+ * @author Thomas Melzig
+ *
+ * $LastChangedBy$
+ */
+
+
+#include <g4-tankresponse/g4classes/G4BeamTestUserTrackingAction.h>
+
+#include "G4Track.hh"
+#include "G4UserLimits.hh"
+#include "G4TrackVector.hh"
+#include "G4TrackingManager.hh"
+
+G4BeamTestUserTrackingAction::G4BeamTestUserTrackingAction(){}
+
+void G4BeamTestUserTrackingAction::PreUserTrackingAction(const G4Track*){}
+
+void G4BeamTestUserTrackingAction::PostUserTrackingAction(const G4Track* track)
+{
+  const G4LogicalVolume *volume = track->GetLogicalVolumeAtVertex();
+  G4UserLimits *limit = volume->GetUserLimits();
+  if(!limit) G4cout << "----> G4LogicalVolume: " << volume->GetName() << " has no defined G4UserLimit" << G4endl;
+  G4double threshold = limit->GetUserMinEkine(*track);
+  G4TrackVector* secondaries = fpTrackingManager->GimmeSecondaries();
+  if(secondaries)
+  {
+    size_t nSeco = secondaries->size();
+    if(nSeco>0)
+    {
+      for(size_t i=0;i<nSeco;i++)
+      {
+        //check if secondary particle is a gamma
+        if((*secondaries)[i]->GetDefinition()->GetParticleName() == "gamma")
+        {
+          //check if particle energy is below threshold; if true, kill the particle
+          G4double energy = (*secondaries)[i]->GetTotalEnergy();
+          if(energy < threshold) (*secondaries)[i]->SetTrackStatus(fStopAndKill);
+        }
+      }
+    }
+  }
+}