Diagram illustrating the process of

Diagram illustrating the process of neutron capture by target nucleus ...... 6
2-2 Characteristic shape of boron peak showing Doppler-broadening ............ 7
2-3 Prompt-gamma spectrum of 27Al .............................................................. 9
2-4 Schematic of reactor neutron spectrum...................................................... 11
2-5 A point source along the axis of a right circular cylindrical detector ....... 17
2-6 Absolute efficiency vs. energy for 32% GEM and GAMMA-X HPGe
coaxial detectors......................................................................................... 19
3-1 Beam port locations in the NSC reactor pool showing BP#1 .................... 27
3-2 Temporary shielding around beam port # 1 ............................................... 29
3-3 Beam port showing location of sapphire crystal ........................................ 32
3-4 Beam port collimator used for PGNAA..................................................... 33
3-5 Top view of the PGNAA system component arrangement........................ 36
3-6 PGNAA facility showing shielding around neutron beam collimator and
beam stop.................................................................................................... 37
3-7 Picture showing HPGe detector mounted on steel rollers.......................... 39
3-8 Picture showing initial shielding around HPGe detector ........................... 40
3-9 Schematic showing PGNAA detection system and acquisition electronics 41
3-10 Dram vials showing markings used to determine sample location ............ 44
3-11 Sample holder used for irradiation ............................................................. 45
3-12 NaCl filled Teflon vial attached to sample holder for irradiation .............. 46