ADAS Subroutine xfelem

      FUNCTION XFELEM ( IZ0 )
C-----------------------------------------------------------------------
C
C ************* FORTRAN77 CHARACTER*12 FUNCTION: XFELEM ****************
C
C PURPOSE: TO RETURN THE NAME OF THE ELEMENT WITH NUCLEAR CHARGE IZ0
C          (CHARACTER*12 FUNCTION VERSION OF 'XXELEM')
C
C CALLING PROGRAM: GENERAL USE
C
C FUNCTION:
C
C          (C*12) XFELEM  = FUNCTION NAME -
C                           NAME OF ELEMENT WITH NUCLEAR CHARGE 'IZ0'
C          (I*4)  IZ0     = ELEMENT NUCLEAR CHARGE
C
C          (C*12) NAMES() = NAMES OF FIRST 50 ELEMENTS.
C                           ARRAY DIMENSION => NUCLEAR CHARGE
C
C NOTES:    IF NUCLEAR CHARGE IS OUT OF RANGE, I.E.NOT BETWEEN 1 & 50,
C           THEN THE CHARACTER STRING 'XFELEM' IS RETURNED BLANK.
C
C ROUTINES: NONE
C
C
C AUTHOR:   PAUL E. BRIDEN (TESSELLA SUPPORT SERVICES PLC)
C           K1/0/81
C           JET EXT. 4569
C
C DATE:     13/02/91
C
C VERSION: 1.2
C UPDATE:   17/09/99  HUGH SUMMERS - INCREASED ELEMENT NUMBER TO 92
C
C-----------------------------------------------------------------------
C-----------------------------------------------------------------------
      INTEGER             IZ0