Analysis of photo neutron production from the patient during radiotherapy treatment using CR 39 SSNTD

Abstract

Most radiation treatments for curing cancer are completely non invasive. Usually patients will undergo radiation treatment to relieve symptoms and pain. The research focuses the various processes involved in generating photo neutron spectrum and dose proceeding from accelerator for treatment. The electrons are stimulated to high energies through a linear tube. These high-energy electron beams similarly treats shallow malignant growths. It tends to strike an objective to create x-ray beams for deep-seated tumor treatments. Hydrogen thyratrons are the direct current power supply for the modulator that has a pulse-forming network with switch tube. This results in a flat-topped high voltage pulse from the modulator area to DC pulse for a few microseconds of the period.Photo neutron spectrum and dose calculated. 15 MV lead to photo neutron production from many of the elements including Tungsten, Lead, Tantalum Nitrogen, Phosphorus and so on. Particularly 207Pb has photo neutron threshold as low as 6.74 MeV and 182W has threshold 8.04 MeV. Moreover, Nitrogen and Phosphorus have a lesser threshold for photo-proton emission at 7.55 MeV and 7.3 MeV respectively. Considering the radiation-weighting factor for neutrons, it is obvious that, the neutron dose considered in the treatment planning process, and we have to incorporate some mechanism in the radiotherapy treatment delivery for neutron free photons.