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Monte Carlo and experimental relative dose determination for an Iridium-192 source in water phantom
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A.A. Mowlavi   , F. Cupardo , M. Severgnini |
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Abstract: (15062 Views) |
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Background: Monte Carlo and experimental
relative dose determination in a water phantom, due
to a high dose rate (HDR) 192Ir source is presented for
real energy spectrum and monochromatic at 356 keV.
Materials and Methods: The dose distribution has
been calculated around the 192Ir located in the center
of 30 cm ×30 cm ×30 cm water phantom using
MCNP4C code by Monte Carlo method. Relative dose
variation has been measured by using Gafchromic
Rtqa along X and Y axis, as well. Percentage depth
dose (PDD) variation along the different axis parallel
and perpendicular the source were calculated. Finally,
F (5cm, θ|) dosimetry parameters of TG-43 protocol
were determined. Results: The results showed that
the Monte Carlo method could calculate dose
deposition in high gradient region, near the source,
accurately. The isodose curves and dosimetric
characteristics obtained for 192Ir source are in good
agreement with experimental results. Conclusion:
The isodose curves of the 192Ir source were derived form
dose calculation by MCNP code. Also, Monte Carlo and
experimental PDD X=2.5 mm are in good agreement,
and the both results y=10 mm, in ||x [-25mm,25mm]
interval were well matched. However, out of this range
Monte Carlo result was estimated to be lower. The
calculated dosimetry parameters for the source were in
agreement with other results. Iran. J. Radiat. Res., 2008 6
(1): 37-42 |
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| Keywords: Brachytherapy, dose distribution, Monte Carlo method, MCNP code, anisotropy function, Gafchromic Rtqa film. |
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Full-Text [PDF 502 kb]
(4463 Downloads)
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Type of Study: Original Research |
Subject:
Radiation Biology
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