Amal Yousif Al Yasiri ¹, Hayder Fadhl Abed ²

Affiliations
1 Department of Basic Sciences, College of Dentistry - University of Baghdad, IR
2 Karbala Technical Institute -Al-Furat Al-Awsat Technical University, IR

Abstract

Objective: The objective of the current study was to estimate the energy spectrum and energy deposition of the photons emitted from ¹²⁵I seed model 6711 with and without the presence of titanium capsule using Monte-Carlo N-Particle code (MCNP) in order to investigate whether the titanium capsule attenuates photons and how much would be the attenuation. Materials and Methods: Two models were built and simulated using MCNPX code, in the first model, the simulation was performed assuming the geometry of ¹²⁵I seed provided by the manufacturers. Whereas in the second model, the simulation was performed assuming that ¹²⁵I seed without titanium encapsulation. For both models, the energy and energy deposition of the photons were estimated. Results: MCNPX computations showed that the energy spectrum released from ¹²⁵I seed with the presence of the capsule was lower than that released without the presence of the capsule for all energies in the spectrum by approximately 19 %. Further, the energy deposition computed with the presence of titanium capsule was lower than that computed without the presence of titanium capsule by nearly 31%. Conclusion: The titanium capsule has an impact on the energy spectrum as well as energy deposition of the photons emitted by ¹²⁵I seed. According to the MCNPX results, titanium capsule attenuates the energy and energy deposition of the radiation emerged from the seed by nearly 19% and 31% respectively.

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