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Radiation Protection Dosimetry 2005 116(1-4):65-68; doi:10.1093/rpd/nci125
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

MCNP simulation of a Theratron 780 radiotherapy unit

R. Miró1,*, J. Soler1, S. Gallardo1, J. M. Campayo2, S. Díez2 and G. Verdú1

1 Departamento de Ingeniería Química y Nuclear, Universidad Politécnica de València, Camí de Vera, s/n, 46022 València, Spain
2 Hospital Clínic Universitari, Avgda. Blasco Ibáñez, 17, 46010 València, Spain

* Corresponding author: rmiro{at}iqn.upv.es

A Theratron 780 (MDS Nordion) 60Co radiotherapy unit has been simulated with the Monte Carlo code MCNP. The unit has been realistically modelled: the cylindrical source capsule and its housing, the rectangular collimator system, both the primary and secondary jaws and the air gaps between the components. Different collimator openings, ranging from 5 x 5 cm2 to 20 x 20 cm2 (narrow and broad beams) at a source–surface distance equal to 80 cm have been used during the study. In the present work, we have calculated spectra as a function of field size. A study of the variation of the electron contamination of the 60Co beam has also been performed.


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