Monte Carlo Dose Calculation Of Rhizophora Spp. Soy Protein Phantom At Radiotherapy Energy Range
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Date
2018-02
Authors
Rabaiee, Nor Ain
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The Malaysian mangrove hardwood, Rhizophora spp. has been extensively
studied as a potential tissue equivalent material. However, the untreated Rhizophora
spp. wood is unsuitable to be used as a phantom, due to its physical properties. Thus,
the treated Rhizophora spp. particleboard was suggested as an alternative. The aim of
this study was to explore the Rhizophora spp. particleboard with soy protein
adhesive, as a potential phantom material, with its application validated using the
Monte Carlo (MC) method at the radiotherapy energy range. The work was initiated
by choosing the best mixture of the Rhizophora spp. with soy protein, based on its
characteristics, i.e. density, electron density, dimensional stability, attenuation
coefficient and effective atomic number. The addition of soy protein as an adhesive
has resulted in a significant improvement in the particleboard’s dimensional stability.
The Rhizophora spp. with particle size of 50–104 μm and 8 % soy protein has been
chosen as the best mixture. The mixture was then used to fabricate the phantom with
various thicknesses (0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 cm) and densities (between 0.99
and 1.06 g/cm3). Meanwhile, the PRIMUS linear accelerator (LINAC) with photon
(6 and 10 MV) and electron (6 and 15 MeV) beams were modelled using the
EGSnrc/BEAMnrc code, while the dose distributions were calculated using the
EGSnrc/DOSXYZnrc code. A commercial solid water phantom was used as a
reference, to validate the performance of the Rhizophora spp. soy protein phantom.
The percentage depth dose (PDD) result for the photon beam energies shows that the
depth of maximum dose, dmax for the Rhizophora spp. soy protein phantom was
identical with that of the standard water phantom.
Description
Keywords
Monte carlo dose calculation of rhizophora spp , soy protein phantom at radiotherapy energy range