ABSTRACT
The activation experiment was performed using the accelerated beam of Phasotron accelerator at the Joint Institute for Nuclear Research (JINR). The natural uranium spallation target QUINTA was irradiated with protons with energy 660â¯MeV. Monte Carlo simulations of neutron production were performed using the Geant4 code. The number of leakage neutrons from the sections of the uranium target surrounded by the lead shielding and the number of leakage neutrons from lead were determined. The total number of fissions in the setup QUINTA was determined. Experimental values of reaction rates for the produced nuclei in the 127I sample were obtained and several values of reaction rates were compared with the results of simulations. Experimentally determined fluence of neutrons in energy interval 10-175â¯MeV using the (n,xn) reactions in the 127I(NaI) sample was compared with the results of simulations. Possibility of transmutation of the long-lived radionuclide 129I in the QUINTA setup was estimated.
ABSTRACT
The first results of the formation and transportation of therapeutic proton beams at the JINR phasotron are presented. To ensure flat-top depth-dose distributions with a steep back slope, a method of forming a beam with a necessary energy spectrum from a non-monoenergic beam is employed. Extension of the flat hop of depth-dose distribution is 4.7 g/cm2 for a proton beam with the mean energy of 200 MeV.
Subject(s)
Particle Accelerators , Protons , Radiotherapy, High-Energy/instrumentation , Technology, RadiologicABSTRACT
A brief consideration of the hardware and software of the automated control system for proton beam therapy in the clinicophysical complex at the JINR Laboratory of Nuclear Problems is presented.
