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Radiation Protection Dosimetry Advance Access published online on October 20, 2008
Radiation Protection Dosimetry, doi:10.1093/rpd/ncn278
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

SPECTRA OF PHOTONEUTRONS PRODUCED BY HIGH-ENERGY X-RAY RADIOTHERAPY LINACS

M. Králík1,*, K. Turek2 and V. Vondrácek3

1 Inspectorate for Ionizing Radiation, Czech Metrology Institute, Radiová 1, CZ 102 00 Prague 10, Czech Republic
2 Department of Radiation Dosimetry, Nuclear Physics Institute, Na Truhlárce 39/64, CZ 186 00 Prague 8, Czech Republic
3 Teaching Hospital Na Bulovce, Budínova 2, CZ 180 81 Prague 8, Czech Republic

* Corresponding author: mkralik{at}cmi.cz

Received May 9, 2008, amended August 29, 2008, accepted September 19, 2008

Spectral fluence of photoneutrons generated in the head of the radiotherapeutic linac Varian 2100 C/D was measured by means of the Bonner spheres spectrometer whose active detector of thermal neutrons was replaced by a track detector, i.e. a sandwich of four CR-39s with the boron radiator inserted between them. Measurements with different collimator settings showed that the fluence of photoneutrons was higher for the more open collimator.


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