Some specific features of ionization chamber calibrations in linac x-ray beams at the LNE-LNHB.
The purpose of this note is to give some details about the modus operandi employed today to calibrate ionization chambers in radiotherapy linac photon beams at the Laboratoire National Henri Becquerel (LNE-LNHB). Some specific features are described: first the equipment (including the external monitoring ionization chambers), second the calculations of the profile or radial non-uniformity correction factors (up to 0.5% effect for commonly used ionization chambers) and finally the calculations to get the calibration coefficients for customer beam qualities.
Delaunay
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F
CEA-Saclay, Laboratoire National Henri Becquerel, PtC 104, 91191 Gif-sur-Yvette Cedex, France. franck.delaunay@cea.fr
Ostrowsky
A
A
D002138:Calibration; D010315:Particle Accelerators; D019047:Phantoms, Imaging; D014867:Water / Q000737:chemistry; D014965:X-Rays
D014867:Water