diff --git a/src/Classic/AbsBeamline/Source.cpp b/src/Classic/AbsBeamline/Source.cpp
index c270506e5280ae94bbb374bd69d907adac2abe3f..6a7a8a5b11226d26ad4e4f5b6dbb8b8d4c99e589 100644
--- a/src/Classic/AbsBeamline/Source.cpp
+++ b/src/Classic/AbsBeamline/Source.cpp
@@ -22,14 +22,16 @@ Source::Source():
 Source::Source(const Source &right):
     Component(right),
     startField_m(right.startField_m),
-    endField_m(right.endField_m)
+    endField_m(right.endField_m),
+    isTransparent_m(right.isTransparent_m)
 {}
 
 
 Source::Source(const std::string &name):
     Component(name),
     startField_m(0.0),
-    endField_m(0.0)
+    endField_m(0.0),
+    isTransparent_m(false)
 {}
 
 Source::~Source() {
@@ -41,6 +43,10 @@ void Source::accept(BeamlineVisitor &visitor) const {
 }
 
 bool Source::apply(const size_t &i, const double &t, Vector_t &/*E*/, Vector_t &/*B*/) {
+    if (isTransparent_m) {
+        return false;
+    }
+
     const Vector_t &R = RefPartBunch_m->R[i];
     const Vector_t &P = RefPartBunch_m->P[i];
     const double &dt = RefPartBunch_m->dt[i];
@@ -94,4 +100,8 @@ void Source::getDimensions(double &zBegin, double &zEnd) const {
 
 ElementBase::ElementType Source::getType() const {
     return SOURCE;
+}
+
+void Source::setTransparent() {
+    isTransparent_m = true;
 }
\ No newline at end of file
diff --git a/src/Classic/AbsBeamline/Source.h b/src/Classic/AbsBeamline/Source.h
index 2783702d0a2ba1ca09f44b1234d7afe261b3e506..1e4fa1f30e8f653b09b3c143a543c7da00258df2 100644
--- a/src/Classic/AbsBeamline/Source.h
+++ b/src/Classic/AbsBeamline/Source.h
@@ -39,11 +39,14 @@ public:
 
     virtual void getDimensions(double &zBegin, double &zEnd) const override;
 
+    void setTransparent();
 private:
 
     double startField_m;           /**< startingpoint of field, m*/
     double endField_m;
 
+    bool isTransparent_m;
+
     std::unique_ptr<LossDataSink> lossDs_m;
 
     // Not implemented.
diff --git a/src/Elements/OpalSource.cpp b/src/Elements/OpalSource.cpp
index e21a75f6c9daa9208fedb608996ec0fa8c766a02..e56b11580dda111539c8eebb559f98d7bf4c658b 100644
--- a/src/Elements/OpalSource.cpp
+++ b/src/Elements/OpalSource.cpp
@@ -26,8 +26,10 @@ OpalSource::OpalSource():
     OpalElement(SIZE, "SOURCE",
                 "The \"SOURCE\" element defines a Source.") {
     itsAttr[DISTRIBUTION] = Attributes::makeStringArray
-                             ("DISTRIBUTION", "List of particle distributions to be used ");
+                            ("DISTRIBUTION", "List of particle distributions to be used ");
 
+    itsAttr[TRANSPARENT] = Attributes::makeBool
+                           ("TRANSPARENT", "Make the source element transparent to impacting elements; Default value is FALSE", false);
     registerOwnership();
 
     setElement(new SourceRep("SOURCE"));
@@ -58,6 +60,10 @@ void OpalSource::update() {
 
     sol->setElementLength(length);
 
+    if (Attributes::getBool(itsAttr[TRANSPARENT])) {
+        sol->setTransparent();
+    }
+
     // Transmit "unknown" attributes.
     OpalElement::updateUnknown(sol);
 }
\ No newline at end of file
diff --git a/src/Elements/OpalSource.h b/src/Elements/OpalSource.h
index 7addfd83e94a87ee70d4b42cf2c61628cb0d1933..236ef3d6303ad2e9c3fb9ae9f2ef6b33fa609efe 100644
--- a/src/Elements/OpalSource.h
+++ b/src/Elements/OpalSource.h
@@ -28,6 +28,7 @@ public:
     /// The attributes of class OpalSource.
     enum {
         DISTRIBUTION = COMMON,  // The longitudinal magnetic field.
+        TRANSPARENT,
         SIZE
     };
 
@@ -52,4 +53,4 @@ private:
     OpalSource(const std::string &name, OpalSource *parent);
 };
 
-#endif // OPAL_OPALSOURCE_HH
+#endif // OPAL_OPALSOURCE_HH
\ No newline at end of file