K fclin,fmsr Qclin,Qmsr CORRECTION FACTORS OF PLASTIC SCINTILLATORS AND OTHER STEREOTACTIC DETECTORS FOR SUB-CENTIMETER PHOTON FIELDS USING MONTE CARLO
The goals of this work are: (1) To evaluate a plastic scintillation detector and other stereotactic dosimeters for measuring output factors, dose profiles and percent depth dose curves of small and sub-centimeter radiation fieldsand (2) to obtain tables of K fclin,fmsr Qclin,Qm...
- Autores:
-
Machado, Norman H.
Restrepo, Johans
- Tipo de recurso:
- Article of journal
- Fecha de publicación:
- 2017
- Institución:
- Universidad Nacional de Colombia
- Repositorio:
- Universidad Nacional de Colombia
- Idioma:
- spa
- OAI Identifier:
- oai:repositorio.unal.edu.co:unal/67316
- Acceso en línea:
- https://repositorio.unal.edu.co/handle/unal/67316
http://bdigital.unal.edu.co/68345/
- Palabra clave:
- 53 Física / Physics
5 Ciencias naturales y matemáticas / Science
Small field dosimetry
Monte Carlo BEAMnrc and DOSXYZnrc
field output factors
plastic scintillation detectors
stereotactic detectors.
Dosimetría de campo bajo
Monte Carlo BEAMnrc and DOSXYZnrc
Factores de salida de campo
Detectores plásticos de centelleo
Detectores Estereotácticos
- Rights
- openAccess
- License
- Atribución-NoComercial 4.0 Internacional
Summary: | The goals of this work are: (1) To evaluate a plastic scintillation detector and other stereotactic dosimeters for measuring output factors, dose profiles and percent depth dose curves of small and sub-centimeter radiation fieldsand (2) to obtain tables of K fclin,fmsr Qclin,Qmsr correction factors based on Monte Carlo simulations using codes BEAMnrc and DOSXYZnrc.Tables of output ratios and dose profiles for radiation fields conformed by a micro-multileaf collimator were obtained for the stereotactic detectors: 1) Standard Imaging W1 Exradin Plastic Scintillation Detector with 1 mm diameter and 3 mm length, 2) PTW dosimetry diode E type 60017 with 1.13 mm diameter and 30 µm thickness and 3) PTW Pinpoint 31016 3D ionization chamber with 3.13 mm diameter.Monte Carlo BEAMnrc simulations were performed for the 6 MeV energy of a Varian Clinac iX linear accelerator with the micro-multileaf collimator attached to its gantry. The OSXYZnrc Monte Carlo code was used to calculate the output factors Ωfclin,fmsr Qclin, Qmsr ,water MC and the dose profiles in a virtual water phantom by means of the phase space file obtained from the BEAMnrc simulation. The K fclin,fmsr Qclin,Qmsr factor tables presented in this work show that for field sizes with radius larger than the range of secondary charged particles, the corrections for the set of detectors are lower than 7 % compared with Monte Carlo calculations. However, for sub-centimeter radiation fields, the corrections are about of 23 % for the PTW Pinpoint ionization chamber and up to 12 % for the rest of detectors. |
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