sets time cut-offs and/or quenching factors when scoring using the
USRBIN or the EVENTBIN options.
(see also TIME-CUT)
WHAT(1) > 0.0 : time cut-off for scoring (seconds)
< 0.0 : resets any previously requested time cut-off 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 g/(MeV cm2)
Default = 0.0
WHAT(4) = lower index bound of binnings in which the requested
scoring time cut-off and/or Birks law coefficients must be
applied ("From binning WHAT(4)...")
Default = 1.0
WHAT(5) = upper index bound of binnings in which the requested
scoring time cut-off 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 cut-off for scoring and
no quenching of dose binning
Notes : 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].
The time cut-off is useful in order to score only within
a time gate between t = 0 and t = cut-off
The scoring time cut-off should not be confused with the
time cut-off 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 cut-off.
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)
