In this study, cross-sections and yield of Pd isotopes induced by bremsstrahlungs, protons and neutrons were studied. The isomer yield ratios of 99m,g;101m,g;102m,gRh produced from the photon-induced nuclear reaction of Pd were investigated using bremsstrahlung from 50 to 70 MeV. The neutron capture cross- section and resonance integral to produce Pd-109 from Pd-108 were determined using thermal and epithermal neutrons. In addition, the production cross-sections of99m,g;101m,g;102m,gRh produced from proton-induced nuclear reactions of natPd were determined by using activation methods and offline γ –ray spectroscopic techniques.
The measurement experiment using the bremsstrahlung was performed at the 100 MeV electron linear accelerator of the Pohang Accelerator Laboratory (PAL). In this study, isomeric yield ratios of the 99m,g;101m,g;102m,gRh from the nuclear reactions natPd (γ, pxn) were first measured in the energy region of interest. We also make calculations of the isomeric yield ratios using the TALYS and compare with experimental data. This study provides important information on the dependence of the nuclear reaction rate on the number of nuclei emitted from the target nucleus and on the braking bremsstrahlung energy.
The production cross-sections of Pd-109 produced by the neutron-induced nuclear reaction on Pd-108 with thermal and epithermal neutrons were determined using the neutron activation method. The neutron capture cross sections on Pd-108 have been determined by using the 197Au(n,γ)198Au monitor reaction and the contributions of thermal and epithermal neutrons were classified by using cadmium ratio method. The aim of this present work is to develop the experimental procedures for the measurements of the reaction cross-sections for thermal and epithermal neutrons and provide more accurate data on the 108Pd(n,γ)109Pd reaction.
Finally, production cross-sections of 99m,g;101m,g;102m,gRh radionuclides produced by proton nuclear reactions of natPd were performed. The cross-sections were determined by the stacked-foil method and the offline γ-ray spectroscopy technique using the 45 MeV proton energy in the MC-50 Cyclotron at KIRAMS. The flux of the proton beam was determined using well-known cross sections of the monitor Cu, and the measured results were compared with the experimental data from the TENDL-2015 library. The experimental cross-section data are reported for the first time in the energy region from 20 to 40 MeV for natPd(p,x)102mRh reaction, in the energy region from 20 to 35 MeV for natPd(p,x)102gRh reaction.
Thesis Advisor: Prof. Guinyun Kim