Neutron spectra and H*(10) of photoneutrons inside the vault room of an 18 MV LINAC

Bañuelos-Frías, Alan and Borja-Hernández, Candy Gretel and Guzmán-García, Karen Arlete and Valero-Luna, Claudia and Hernández-Dávila, Víctor Manuel and Vega-Carrillo, Héctor René (2012). Neutron spectra and H*(10) of photoneutrons inside the vault room of an 18 MV LINAC. "Revista Mexicana de Física", v. 58 ; pp. 192-194. ISSN 0035-001X.

Description

Title: Neutron spectra and H*(10) of photoneutrons inside the vault room of an 18 MV LINAC
Author/s:
  • Bañuelos-Frías, Alan
  • Borja-Hernández, Candy Gretel
  • Guzmán-García, Karen Arlete
  • Valero-Luna, Claudia
  • Hernández-Dávila, Víctor Manuel
  • Vega-Carrillo, Héctor René
Item Type: Article
Título de Revista/Publicación: Revista Mexicana de Física
Date: June 2012
ISSN: 0035-001X
Volume: 58
Subjects:
Freetext Keywords: Monte Carlo simulations; Linac; Radiotherapy; Spectrometry; Simulaciones Monte Carlo; Linac; Radioterapia; Espectrometría
Faculty: E.T.S.I. Industriales (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Las estimaciones se llevaron a cabo utilizando métodos Monte Carlo donde una sala realista fue modelada incluyendo un fantoma de tejido equivalente. El término fuente para neutrones fue calculado usando la función de Tosi et al, la cual contabiliza los neutrones de evaporación y reacción directa. El espectro fue estimado usando dos diferentes distribuciones de energía. Los detectores fueron colocados en el plano donde se encuentra el isocentro. Dentro de la sala de tratamiento, como la distancia respecto al isocentro aumenta, la cantidad de neutrones y H*(10) se reduce, los neutrones dentro de la región de alta energía son desplazados a una región de menor energía de alrededor de 0.1 MeV. Sin embargo, los neutrones epitérmicos y térmicos permanecen constantes debido al efecto de room-return. En el laberinto el espectro es dominado peor neutrones térmicos y epitérmicos los cuales contribuyen a la producción de activación y a la producción de rayos gamma prontos. = Neutron spectra and the ambient dose equivalent were estimated inside the radiotherapy hall with an 18 MV linac. Estimations were carried out using Monte Carlo methods where a realist hall was modeled including a phantom made of equivalent tissue. The source term for photoneutrons was calculated using the Tosi et al. function that account for evaporation and knock-on neutrons. The spectra were estimated using two different energy distributions. Detectors were located in several sites inside the hall including the maze and outside the hall door, all detectors were located at the plane were the isocenter is located. In the treatment hall, as the distance respect to the isocenter is increased, the amount of neutrons and the H*(10) are reduced, neutrons in the high-energy region are shifted to lower region peaking around 0.1 MeV, however the epithermal and thermal neutrons remain constant due to the room-return effect. In the maze the spectra are dominated by epithermal and thermal neutrons that contributes to produce activation and the production of prompt gamma-rays.

More information

Item ID: 45498
DC Identifier: http://oa.upm.es/45498/
OAI Identifier: oai:oa.upm.es:45498
Official URL: http://rmf.smf.mx/
Deposited by: Memoria Investigacion
Deposited on: 20 Apr 2017 17:45
Last Modified: 17 Jul 2019 14:07
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