Obtaining the intrinsic electron spectrum of linear accelerators using the relation between the current of the bending magnet and the absorbed dose in water.
OBJECTIVE
To present a novel methodology to model the intrinsic electron spectra of a linear accelerator and its situation with respect to the energy window.


METHODS
The spectra are obtained by fitting the variation of R(50) and the maximum dose rate measured in a water phantom with the bending magnet current. The obtained spectra are verified with a realistic Monte Carlo simulation of the accelerator.


RESULTS
The intrinsic spectra and their relative position with respect to the energy window of the bending magnet have been obtained for a Siemens Mevatron KDS and an ELEKTA SL20 accelerators.


CONCLUSIONS
Using this method in the commissioning and scheduled revisions of the accelerator, the tuning of the current of the bending magnet could be done in such a way that both the quality of the beam and the dose rate would reach a better long-term stability.
de la Vega
Jose M
JM
Servicio de Radiofísica, Hosp. Univ. San Cecilio, Granada, Spain. jasx77@gmail.com
Guirado
Damián
D
Vilches
Manuel
M
Perdices
Jose I
JI
Lallena
Antonio M
AM
D004583:Electrons; D008280:Magnetics; D010315:Particle Accelerators; D014867:Water
D014867:Water