TCQUENCH

    sets time cutoffs and/or quenching factors when scoring using the USRBIN or
    the EVENTBIN options.

    See also TIME-CUT

     
WHAT(1)
 > 0.0 : time cutoff for scoring (seconds)
             < 0.0 : resets any previously requested time cutoff to default
                     (infinity)
             = 0.0 : ignored

     
WHAT(2)
 > 0.0 : first Birks law coefficient in g/(MeV cm2)
             = 0.0 : ignored
             < 0.0 : resets both Birks law coefficients to default = 0.0

     
WHAT(3)
 > 0.0 : second Birks law coefficient in g2/(MeV2 cm4)
               
Default
 = 0.0


     
WHAT(4)
 = lower index bound (or corresponding name) of binnings in which
               the requested scoring time cutoff and/or Birks law coefficients
               must be applied ("From binning 
WHAT(4)
...")
               
Default
 = 1.0

     
WHAT(5)
 = upper index bound (or corresponding name) of binnings in which
               the requested scoring time cutoff and/or Birks law coefficients
               must be applied ("...To  binning 
WHAT(5)
..."
               
Default
 = 
WHAT(4)

     
WHAT(6)
 = step length in assigning indices ("...in steps of 
WHAT(6)
").
               
Default
 = 1.0

     
SDUM
 :    not used

     
Default
 (option TCQUENCH not given): no time cutoff for scoring and no
             quenching of dose binning

     
Notes:
         1) Binnings are numbered sequentially in the order they are input via
            the USRBIN or EVENTBIN options. Of course, for quenching to be
            applied the quantity binned must be energy (generalised particle 208
            or 211). The energy deposited in a charged particle step is
            "quenched" according to Birks law, i.e. it is weighted with a factor
            dependent on stopping power S = dE/dx:
                      dE' = dE/(1 + BS + CS**2)
            with B = first Birks parameter and C = Chou or second Birks
            parameter [Bir64].

         2) The time cutoff is useful in order to score only within a time gate
            between t = 0 and t = cutoff

         3) The scoring time cutoff should not be confused with the time cutoff
            for transport (see TIME-CUT). Particles outside the time gate
            defined by TCQUENCH are still transported and can contribute to
            scoring in regions and in binnings having a different time scoring
            cutoff.

         4) If the source has been defined as a radioactive isotope (command
            BEAM with 
SDUM
 = ISOTOPE), transport of each isotope decay secondary
            starts with an age equal to the time of decay.

     
Example:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+...
 TCQUENCH        20.0   7.35E-3   1.45E-5       4.0      10.0       3.0
 *  Set a 20 sec time scoring cutoff for binnings 4, 7 and 10, and apply to
 *  them the NE213 scintillator Birks parameters published by Craun and
 *  Smith, Nucl. Instr. Meth. 80, 239 (1970)

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