G4Element* elK = new G4Element( name = "Potassium",
                                  symbol = "P",
                                  z = 19.0, a = 30.0983* g/mole );
  G4Element* elP = new G4Element( name = "Phosphorus",
                                  symbol = "P",
                                  z = 30.0, a = 30.973976* g/mole );
  G4Element* elFe = new G4Element( name = "Iron",
                                   symbol = "Fe",
                                   z = 26, a = 56.845* g/mole );

the parameters for defining elements in DicomDetectorConstruction.cc are not correct, and they should be

  G4Element* elK = new G4Element(name="Potassium",
                                 symbol="P",
                                 z=19.0, a=39.0983*g/mole );//old a is wrong with 30.0983,2012-02-18
  G4Element* elP = new G4Element(name="Phosphorus",
                                 symbol="P",
                                 z=15.0, a=30.973762*g/mole );//old z is wrong with 30,2012-02-18
  G4Element* elFe = new G4Element(name="Iron",
                                  symbol="Fe",
                                  z=26, a=55.845*g/mole );//old a is wrong with 56.845,2012-02-18