Date: Mon, 12 Sep 2016 15:27:05 -0500
Dear FLUKA users,
Could you please help me with the following problem?
I want to calculate the LET spectra at different depths within Polyethylene
using 1GeV/n Silicon beam. Once the LET spectrum is scored at a certain
position within a medium, we can use it to calculate the absorbed dose at
that position. We can also score the absorbed dose directly in the same
depths by means of USRBIN card.
[image: Inline image 1]
However, the values of absorbed dose at the certain position calculated
from these two different methods, one using LET spectra and other scored by
USRBIN, do not agree with each other. I have compared both the absolute
values and normalized values. I am wondering if I am missing anything
specific in the calculation for this energy of beam (1GeV/n).
Below are the main FLUKA card options that I have used in my input file
besides the beam and geometry definitions.
DEFAULTS==> NEW-DEFA
PHYSICS==> EVAPORAT, New Evap with heavy frag
PAIRBREM==> Act: Both, e-e+ Thr: 0.0, y Thr:
0.001
Mat: AIR to Mat: POLYETHY
IONTRANS==> Transport: HEAVYION
USRYIELD==> Type: Yield ie: Particle LET,
ia: Particle charge
Part: HEAVYION, Yield:
,
Min1: Max1: 500
Min2: Max2: 100
Kind: d2N/dx1dx2 Mat: Water
USRBIN==> Type: X-Y-Z, Part: DOSE
I have used "ldpm3qmd" while compiling.
Kindly,
Rajesh Panthi
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