Ae. Pillay et al., The use of macro and micro proton beams to study the variation in PIXE yield from metal targets insulated with PTFE, glass and nylon, J RAD NUCL, 240(1), 1999, pp. 315-319
Proton beams of diameters of 3 mm and 3 mu m, were used to observe the diff
erences in PIXE yield from pure metal targets encapsulated with PTFE, glass
(macor) and nylon. The beam energy was kept constant at 700 keV. Beam curr
ents varied from about 200 pA with the microbeam and between 1-10 nA with t
he macrobeam. Considerable enhancement was observed mainly with the use of
PTFE, up to about a factor of 18 with the macrobeam and 306 with the microb
eam.