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Proceedings Paper

Neutron dosimetry in linear electron accelerator during radiotherapy treatment: simulation and experiment
Author(s): Claudio Manfredotti; U. Nastasi; C. Ongaro; E. Stasi; Alessandro Zanini
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Paper Abstract

In the electron linear accelerators used for radiotherapy by high energy electrons or gamma rays, there is a non negligible production of neutrons by photodisintegration or electrodisintegration reactions on the high Z components of the head machine (target, flattening filter, collimators). At the Experimental Physics Department of Torino University, Torino, Italy an experimental and theoretical evaluation has been performed on the undesired neutron production in the MD Class Mevatron Siemens accelerator used at the Radiotherapy Department of S. Giovanni Battista A.S. Hospital for cancer therapy by a 15 MV gamma ray beam. A simulation of the total process has been carried out, using EGS4 MonteCarlo computer code for the evaluation of photoneutron spectra and MCNP code for the neutron transport in the patient's body. The geometrical description both of the accelerator head in EGS4 and of the anthropomorphous phantom in MCNP have been highly optimized. Experimental measurements have been carried out by bubble detectors BD 100R appropriately allocated inside a new phantom in polyetylene and plexiglass, especially designed for this purpose.

Paper Details

Date Published: 3 March 1995
PDF: 8 pages
Proc. SPIE 2339, International Conference on Neutrons and Their Applications, (3 March 1995); doi: 10.1117/12.204162
Show Author Affiliations
Claudio Manfredotti, Univ. di Torino and INFN/Sezione di Torino (Italy)
U. Nastasi, Ospedale S. Giovanni Battista (Italy)
C. Ongaro, Ospedale S. Giovanni Battista (Italy)
E. Stasi, Ospedale S. Giovanni Battista (Italy)
Alessandro Zanini, INFN/Sezione di Torino (Italy)

Published in SPIE Proceedings Vol. 2339:
International Conference on Neutrons and Their Applications
George Vourvopoulos; Themis Paradellis, Editor(s)

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