The purpose of this survey is to manufacture Rhizophora spp. Particleboard humanoid chest apparition and compare it with perspex apparition, and H2O apparition in therapy scope by utilizing TLD and other sensors to find the dosage in apparition at different deepness in different type of apparition utilizing photon and negatron beam.
Fabricate Rhizophora spp atom board torso apparition of an grownup medium female and compare it with perspex apparition that fabricated by Dr Ahmad Alzoubi ( Alzoubi 2009 ) for the same female in USM labaratory in therapy scope.
In radiation therapy, the term apparition is a tissue tantamount stuff used to mensurate the dose distribution alternatively of the patient to correlate the absorbed dose to the tissue.The primary apparition recommended for dosimetry is H2O apparition, but since it is non ever practical to execute dosimetric measurings in H2O medium, solid homogenous apparitions such as polystyrene, acrylic and apparitions made from proprietary stuffs have found considerable popularity ( Khan, 1994 ) .
The most late surveies were done on Rhizophora spp Phantom ( Tajuddin A.A et Al 1996, Tajuddin & A ; Banjade 2000 ) . Rhizophora spp is a genus of tropical trees which is hard to manage, to cut and determine due to it ‘s compact construction, heavy and strong in strength. While fabricated Rhizophora spp. Particle board can get the better of this job by being easy to manage, cut and determine into the needed size and form.
1.1 Literature reappraisal
Che Wan Sudin ( 1993 ) has studied the composing of Rhizophora spp, happening favorable composing between this medium and H2O. Further probe of this wood by Tajuddin et Al. ( 1996 ) , showed Rhizophora spp to hold similar sprinkling and radiographic belongingss to that of H2O and modified gum elastic. Eid ( 1999 ) measured dose distribution around brachytherapy beginnings, demoing for dose distributions around 137Cs and 192Ir beginnings, that there is general understanding between consequences for Rhizophora spp and H2O. In D.P. Banjade survey ( 2001 ) Rhizophora spp was evaluated as a H2O tantamount apparition medium for high energy photon and negatron beams both in footings of deepness ionisation and energy deposition. The depth-dose distributions in Rhizophora spp apparition have been found to be comparable with those for H2O, one exclusion being at deepnesss beyond Rt, for the 12MeV negatron beam.
Further survey of dose mapping techniques was done by D P Banjade et Al ( 2002 ) to look into the dose distribution throughout a planned mark volume ( PTV ) in a humanoid chest apparition exposed to a 6 MV photon beam.
1.2 Problem Statement
While fabricated Rhizophora spp was surveies by other research workers as noted in the literature reappraisal, but none of these surveies used this type of apparition in radiation therapy scope. Besides this survey will plan the fancied Rhizophora spp as humanoid chest apparition and torso apparition of an grownup medium female so that the hazard effects of radiation during chest malignant neoplastic disease radiation therapy intervention can be studied by mensurating the dosage in the lung, bosom and contralateral chest by utilizing this apparition. Furthermore, this survey will widen to analyze the dose function technique to look into the dose distribution throughout a planned mark volume ( PTV ) in a humanoid chest apparition exposed to a 6 MV photon beam.
1.3 Research Aims
The purposes of this survey are:
To manufacture Rhizophora spp. Particle board as tissue tantamount apparition
To analyze the response behaviour of thermolominensce ( TLD-100 ) for photon and negatron beam by utilizing Rhizophora spp. Particle board apparition.
To determine the fabricated Rhizophora spp. Particle board as android chest apparition and analyze the dose function techniques at 6 MV photon beam
To analyze the dosage in the lung, bosom and contralateral chest during radiation therapy intervention.
To compare Rhizophora spp. Particle board with Lucite apparition, and H2O apparition in therapy scope.
Procedure of Rhizophora spp Particleboard
The phonograph record of Rhizophora spp. wood is traveling under come offing procedure to do it smaller in size like chip-shape. Then, these will be put in crunching machine to bring forth flakes. Resin will be sprayed over these flakes to beef up the particleboard. Phenol Formaldehyde ( PF ) will be used in this survey, because it is more upwind resistant, better thermic features and highly lasting than other adhesives ( e.g. Urea methanal ) .
Then the mixture of flakes and PF will be put into the mold, after which it will undergo hot pressure. Last, particleboard must be cooled, so that it can be carried out from mold without any clefts.
Response Behavior of TLD
Reproducibility: utilizing 100 CGy, 100 centimeter SSD, 10 ten 10 cm2 Field size, TLDs placed at deepness ( 1.5 centimeter ) and ion camber in Rhizophora spp apparition.
Linearity Response: survey the one-dimensionality of TLD for different doses utilizing 6 MV X ray at fixed SSD and field size.
Field Size Response: the end product factor will be determined as a ratio of mensural doses at different field size to the calculated dosage at fixed field size ( 10 x 10 cm2 ) .and study the relationship of the end product factor and the field size.
Consequence of cuneus: the cuneus rectification factor is the ratio between the cuneus transmittal factor for a 10 x10 cm2 field size measured with the ionising chamber placed at dmax, and the cuneus transmittal factor for the same field size, measured with the TLDs placed at the field at dmax, in the apparition. The relationship between the Correction Factor calculated with the cuneus angle will be studied.
Dose rate dependance: exposing TLD and ion chamber for different SSD value and mention scene will be used for all measuring.
Percentage Depth Dose Curve ( PDD ) by exposing TLDs and ion chamber at different deepness in the fancied apparition, mention scene will be used for all measuring.
Fabricated Rhizophora spp Humanoid Breast and Torso Phantoms
The CT scan of 1 cm piece thickness of a medium built female will be used to bring forth the existent size and contour of her trunk including the lungs.
Flow chart for the methodological analysis
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Tajuddin, A.A. , Che Wan Sudin, C.W.A. , Bradley, D.A. , 1996.Radiographic and dispersing probe on the suitableness of Rhizophora spp as tissue tantamount medium for dosimetric survey. Radiat. Phys. Chem. 47, 739-740.
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