In X-ray radiotherapy accelerators, neutrons are produced mainly by ( , n) reaction when high energy X-rays interact with high Z materials of the linear accelerator head. These materials include the lead (Pb) used as shielding in the collimator, tungsten (W) target used for the production of X-rays and iron (Fe) in the accelerator head. These unwanted neutrons contaminate the therapeutic beam a...

This study involves the measurement of photoneutron contamination emitted from a Siemens Primus medical linear accelerator by using BD-PND bubble detectors. Various bubble detectors were arranged around the linac head with the interval of I m and at the same height as the isocenter to measure the dose equivalent distribution in the treatment room. The measurements were performed for 15 MV X-ray...

This work concerns neutron doses associated with the use of a Siemens Primus M5497 electron accelerator, which is operated in photon mode at 15 MV. The conditions offer situation within fraction bremsstrahlung emission energies exceed photoneutron threshold. For different field sizes, an investigation has been made dose equivalent values various measurement locations, including: (i) At treatmen...

We measured neutron energy spectra for the photonuclear reactions of 16.6 MeV linearly polarized photons on Pb, Au, Sn, Cu, Fe and Ti. The each target show dependence mass, as well angle between directions emission polarization. components angular were extracted from compare with excited levels residual nuclei. Based data, we discuss a plan further experiments to clearly observe features spectra.