Spectra of photons and neutrons generated in a heterogeneous head of a 15 MV LINAC at differents field sizes

被引：1
|
作者：
Benites-Rengifo, J. L. [1 ]
Vega-Carrillo, H. R. [2 ]
Velazquez-Fernandez, J. B. [1 ]
机构：
[1] Univ Autonoma Nayarit, Posgrado & CBAP, Carretera Tep Compostela Km 9 CP 63780, Xalisco, Nayarit, Mexico
[2] Universidad Autonoma Zacatecas, Unidad Acad Estudios Nucl, Monaco 98000, Monaco
来源：
MEDICAL PHYSICS | 2012年 / 1494卷
关键词：
LINAC; Neutrons; Monte Carlo;
D O I：
10.1063/1.4764585
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
Spectra of photons and neutrons were calculated, using the Monte Carlo code MCNP-5 using the e/p/n mode. A heterogeneous model was used to define the linac head where the collimators were modeled to produce five different treatment fields at the isocenter. Photon and neutron spectra were estimated in several points along two directions from the isocenter. The total photon fluence beyond 60 cm behaves according to 1/r(2) rule, while total neutron fluence, beyond 80 cm, can be described by diffusion theory using an infinite plane as a neutron source.
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页码：8 / 11
页数：4
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