Study on the Effect of Energy Parameter of
Electron on the Percentage Depth Dose of
Electron Beam Using Monte Carlo Method
Department of Physics, Institut Teknologi Bandung, Indonesia
Abstract. In medical linear accelerator, the energy parameter of electron plays important role to
produce electron beam. The percentage depth dose of electron beams takes account not only on
the value of electron’s energy, but also on the type of electron’s energy. The aims of this work
are to carry on the effect of energy parameter of electron on the percentage depth dose of
electron beam. Monte Carlo method is chosen in this project, due to the superior of this method
for simulating the random process such as the transport particle in matter.
The DOSXYZnrc usercode was used to simulate the electron transport in water phantom. Two
aspects of electron’s energy parameter were investigated using Monte Carlo simulations. In the
first aspect, electron energy’s value was varied also its spectrum. In the second aspect, the
geometry of electron’s energy was taken account on. The parallel beam and the point source
were chosen as the geometry of The measurements of percentage depth dose were conducted to
compare with its simulation. The ionization chamber was used in these measurements.
Presentation of the results of this work is given not only based on the shape of the percentage
depth dose from the simulation and measurement, but also on the other aspect in its curve. The
result of comparison between the simulation and its measurement shows that the shape of its
curve depends on the energy value of electron and the type of its energy. The energy value of
electron affected the depth maximum of dose.
Keywords: Electron beam, Monte Carlo method, percentage depth dose.
Since electron beam has been used to kill cancer’s cells, the characteristics of
electron source are needed. The important of its characteristics are the information
about the electron energy source. Here, the value of energy of electron beam and the
geometry of the electron play important role to calculate dose in patient.
In practice, to determine the value of energy electron beam and the geometry of
electron source directly from linear accelerator are impossible. From the high voltage,
only the maximum value of energy electron beam can be known, but it is difficult to
have information of its spectrum. Some complicated and extensive measurement can
be done to have the both characteristics of electron beams [1, 2, 3].
On the other hand, the fast evolution in computer technologies and the adapted
Monte Carlo (MC) method reduce the computing time of this method, and can thereby
realize the virtual experiments to study the effect of parameters of beam source on its
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International Conference on Advances in Nuclear Science and Engineering—ICANSE 2009
edited by Z. Su’ud and A. Waris
© 2010 American Institute of Physics 978-0-7354-0790-9/10/$30.00