GEANT4 simulation of the angular dependence of TLD based monitor response
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2006
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INTERNATIONAL SYMPOSIUM ON RADIATION PHYSICS, 10th
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In this work the response of thermoluminescent monitors to X-ray beams
impinging on them at different angles was investigated and compared with results of
simulations performed with the GEANT4 radiation transport toolkit. Each monitor
contains four thermoluminescent detectors (TLD): two CaF2 pellets and two TLD-100
(one of each type within lead filter and the other without filter). This set of detectors
allows the determination of photon energy. Monitors were irradiated free-in-air with
beams of narrow and wide spectra with effective energies of 34, 61 and 130 keV and
angles of incidence of 0°, 30°, 45° and 60° using a X-ray Philips MG-450 tube.
Curves of thermoluminescence response relative to air kerma as a function of photon
effective energy for each detector experimentally obtained are used to correct the
energetic dependence of TL response. Such curves were also obtained from the data
of radiation energy stored into the TLDs provided by the simulations. The differences
between experimental results and the Monte Carlo simulations indicate that the dose
distribution is strongly affected by the thickness of lead filter, which attenuates the
intensity of radiation incident on the monitor. The attenuation increases with the
increase of the incidence angle, since the thickness of lead traversed by the beam
also increases. As the monitor calibration is usually performed with the beams
impinging the monitor at 0°, changes in the attenuation become a source of error in
the energy determination and consequently in the value of dose equivalent which is
obtained with this monitor. Correction factors to compensate this effect can be
evaluated with Monte Carlo simulations.
Como referenciar
GUIMARAES, C.C.; MORALLES, M.; OKUNO, E. GEANT4 simulation of the angular dependence of TLD based monitor response. In: INTERNATIONAL SYMPOSIUM ON RADIATION PHYSICS, 10th, September 17-22, 2006, Coimbra, Portugal. Abstract... p. D-34. Disponível em: http://repositorio.ipen.br/handle/123456789/20401. Acesso em: 30 Dec 2025.
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