The codes (EGSnrc, BEAMnrc) are used to simulate 6MV photon beam produced by
Varian ix linear accelerator and different field size (2020, 1010, 44cm2). The
simulation data is stored in a phase space file that contains complete details of the dat
es of
each particle by tracking its path and interactions.
Phase space files were analyzed using BEAMDP code to:
- Obtain energy spectrum, energy flow, distribution of the mean energy and the
angular distribution of the photons and contaminant electrons on surface of water phantom
and 100cm away from linear accelerator head.
- Study effect of field size on distribution of the energy spectrum 6MV.
- Study of change in distribution of mean energy between center and edge of the field
size.
- Calculation the contribution of contaminant electrons within photonic beam at
21%.
To calculate the dose distributions of 6 MeV photon beam at variable depth
in 3D water phantom the MCNP4C2 code was used, and the simulated dose
profile was compared with that of the treatment planning computer system
(TPS), and a good agreement w
as found between them.
In conclusion, the MCNP4C2 code package presents a good tool adaptable
to get dose distributions for the 6MeV photon beam and it can be considered as
confirmed method for patient dose calculations.
This research could be considered as a continuous study of luminescence spectrum of praseodymium cascade photon emission Pr3+ of 1% ions effect on Li2YB5O10 and LaF3 crystals. The Li2YB5O10 crystal shows many spectrum peaks, mainly of 272nm and 300nm
wavelengths of luminescence decay τ=10.6 ns. The other crystal LaF3 shows two sharp spectrums of 478.6nm and 485.5nm wavelengths, which are due to the energetic transitions of 3P0→3H4 of luminescence decay τ=1.8 ns. This study proves that these two crystals exhibit good luminescence properties as promising compounds for laser and medical equipments to be used in radiation detectors and other research domains.
The measurements were done in Tech-governmental University of Petersburg, Russia, 2008.
