
 ALL MATERIAL CONSTANTS ARE PARTLY STORED ON THE COMMON /MAT IN THE
 BLOCK DATA OR CALCULATED IN THE ROUTINE MATTER.IN PRESENT VERSION
 THERE MAY BE DEFINED UP TO 20 MATERIALS WITH THE MATERIAL-INDEX
 NUMBER 'IND' . THIS MATERIAL INDEX NUMBER MUST BE GIVEN FOR
 EACH CELL OF A CALORIMETER IN THE GEOMETRY INPUT DATA CARDS.
 (SEE COMMON /CALSTR AND INIT). IND =0 IS ALWAYS INTERPRETED AS
 VACUUM IN THE PROGRAM.
C
 DEN   (IND+1) =  DENSITY (GR/CM**3)
 RADLTH(IND+1) =  RADIATION LENGTH (CM)
 ATNO  (IND+1) =  ATOMIC NUMBER (AVERAGE VALUE, SEE LATER)
 ZNO   (IND+1) =  CHARGE NUMBER OF NUCLEUS (AVERAGE VALUE, SEE LATER)
 ABSL  (IND+1) =  ABSORPTION LENGTH (ONLY USED FOR STEP SIZE
                  CALCULATION)
 CDEN  (IND+1) =  C - PARAMETER IN STERNHEIMERS THEORY
 MDEN  (IND+1) =  M - PARAMETER IN STERNHEIMERS THEORY
 X0DEN (IND+1) =  X0- PARAMETER IN STERNHEIMERS THEORY
 X1DEN (IND+1) =  X1- PARAMETER IN STERNHEIMERS THEORY
 RION  (IND+1) =  IONISATION POTENTIAL
 MATID (IND+1)    =  GHEISHA ALPHANUMERIC LABEL (A4)
 MATID1(IND+1,24) =  EGS ALPHANUMERIC LABEL (24*A1)
   10 PARAMETERS DESCRIBING THE MATERIAL AT VARIOUS PLACES
   IN THE PROGRAM :
 PARMAT(IND+1, 1) = X    DE/DX CORRECTION FACTOR FOR LANDAU
                         TYPE DISTRIBUTIONS
 PARMAT(IND+1, 2) = 1.   FOR SOLIDS
                  = 2.   FOR FLUIDS
                  = 3.   FOE GASEOUS MATERIALS
 PARMAT(IND+1, 3) = 1.   DELTA-RAY SELECTION : ALL PARTICLES
                  = 2.   DELTA-RAY SELECTION : ONLY MUONS
                  = 3.   DELTA-RAY SELECTION : MUONS AND ELECTRONS
                  = 4.   DELTA-RAY SELECTION : MUONS,ELECTRONS,PIONS
 PARMAT(IND+1, 4) =      MINIMUM RANGE FOR DELTA-ELECTRONS
 PARMAT(IND+1, 5) = 1.   FOR ANORGANIC SCINTILLATORS ONLY
 PARMAT(IND+1, 6) =      SATURATION COEFFICIENT IN BIRK'S LAW
                  = 1.   DEFAULT VALUE  SAT=0.010/DENSITY,
                  > 1.                  SAT=PARMAT(IND+1,6)-1.
 PARMAT(IND+1, 7) > 0.   INDUCED HADRON NUCLEAR FISSION
 PARMAT(IND+1, 8) > 0.  PHOTOABSORBTION AND PHOTOFISSION
 PARMAT(IND+1, 9) > 0.  NATURAL RADIOACTIVITY
 PARMAT(IND+1,10) =     CORRECTION FACTOR FOR ENERGY LOSS BY
                        NUCLEAR BREAKUP EFFECTS
                  = 0.  DEFAULT MODEL DESCRIPTION IS USED.

    THE DENSITY, ATOMIC NUMBER AND CHARGE NUMBER , DEFINED ABOVE,
    ARE AVERAGE VALUES FOR COMPOUND MATERIALS LIKE BGO.
    THESE VALUES ARE USED FOR DE/DX- CALCULATIONS ONLY.

 ALL MATERIALS MAY BE DEFINED AS COMPOUNDS OR MIXTURES,
 THE FOLLOWING NUMBERS ARE TAKEN FROM THE EGS DATA FILE,
 OR, IF NOT GIVEN, CALCULATED.
 IFRAC(J)      = NUMBER OF COMPOUNDS IN THIS MATERIAL
 FRAC1(J,I)    = PARTIAL INTERACT.LENGTH OF THE I.TH COMPOUND
 DEN1 (J,I)    = PARTIAL DENSITY   OF THE I.TH COMPOUND
 ATNO1(J,I)    = ATOMIC NUMBER     OF THE I.TH COMPOUND
 ZNO1 (J,I)    = CHARGE NUMBER     OF THE I.TH COMPOUND


