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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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