6533b870fe1ef96bd12cf293
RESEARCH PRODUCT
The FiR 1 photon beam model adjustment according to in-air spectrum measurements with the Mg(Ar) ionization chamber.
Sauli SavolainenSauli SavolainenPetri KotiluotoTobias SchmitzHanna KoivunoroHanna KoivunoroEero HippeläinenTom SerénIiro AuterinenYuan-hao Liusubject
PhotonQuantitative Biology::Tissues and OrgansPhysics::Medical PhysicsMonte Carlo methodAnalytical chemistryBoron Neutron Capture TherapySensitivity and SpecificityOpticsNuclear ReactorsDosimetryPenelopeIonization ChamberDosimetryComputer SimulationPhoton beamRadiometryMonte CarloPhysicsPhotonsRadiationModels Statisticalbusiness.industryAirRadiotherapy Planning Computer-AssistedReproducibility of ResultsEquipment DesignNeutron radiationEquipment Failure AnalysisIonization chamberBNCTPhysics::Accelerator PhysicsComputer-Aided DesignDose ratebusinessMCNP5Beam (structure)description
Abstract The mixed neutron–photon beam of FiR 1 reactor is used for boron–neutron capture therapy (BNCT) in Finland. A beam model has been defined for patient treatment planning and dosimetric calculations. The neutron beam model has been validated with an activation foil measurements. The photon beam model has not been thoroughly validated against measurements, due to the fact that the beam photon dose rate is low, at most only 2% of the total weighted patient dose at FiR 1. However, improvement of the photon dose detection accuracy is worthwhile, since the beam photon dose is of concern in the beam dosimetry. In this study, we have performed ionization chamber measurements with multiple build-up caps of different thickness to adjust the calculated photon spectrum of a FiR 1 beam model.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-01 | Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine |