
               *******************
               ***  MANDATORY  ***
               *******************

 --- DETECTOR : do the following modifications to the
                previous ( 1_geom/ ) detector:
 
      *  Replace the absorber material from Iron to Copper

            Copper:       Z = 29
                          A = 63.546 g/mole
                    density = 8.96 g/cm3
            
      *  Change the temperature of the active layer of gas CO2 
         from 300 kelvin to: 
            temperature = 325 kelvin.
         (assuming all the rest the same as before).
