Re-utilization of long lived Tc radio isotope via Photon induced nuclear reactions.

Technetium-99 is a radioactive waste produced primarily in nuclear reactors. It is also left as radioactive waste in hospitals, directly from Tc isomeric state. To bring down the quantity of technetium-99 radioactive waste, the nuclear reactions using photon beam is explored.

Spectroscopic analysis of photoneutrons in intense γ-ray background.

CR-39 SSNTD is used to measure the photoneutron spectrum produced by a medical linear accelerator in an intense γ-ray background. The spectroscopic resolution and the neutron detection threshold have been improved by introducing the event selection criteria, based on the track diameter-brightness correlation. The CR-39 detector's efficiency is determined by adapting the H(n,el) cross section from the ENDF/B-VIII.

The effect of geometry dependent Chamber Spatial Response Function in small field profile measurements.

The effect of Chamber-Spatial Response Function (CSRF) on beam profile measurements has been studied for Standard Ionization Chamber-Radiation Field Analyzer setup. The Chamber-Spatial Response Function is assumed to be Gaussian and parameterized through the projected geometry of the chamber along the measurement axis. CSRF widths was measured by constructing chamber diameter-FWHM correlation for a set of ionization chambers.

Experimental determination of thermal neutron fluence around Elekta Versa HD linear accelerator for various photon energies.

A complex neutron spectrum generated along with a useful photon beam imposes an additional radiation protection risk around medical linear accelerators (linac). The thermal neutron component of this complex neutron spectrum formed during different photon modes of operation of Elekta Versa HD linac has been quantified using Indium foil activation technique. The thermal neutron fluence (Φ ) at isocenter for 15 MV, 10 MV and 10 MV FFF beams was found to be 2.