Detection of high Z (>20) trace elements in calcareous biological materials by PIXE using a Si(Li) detector requires suppression of pile-up due to high intensity Ca and P X-rays. These X-rays may be attenuated evenly by pinhole. Data processing will be straightforward if the filter material is uniform in thickness and if the dimensions of the hole are well-known. However, trying this approach, numerous minuscule punctures and pits in the aluminium foils to start from were detected by STIM microanalysis. Instead of pursuing an ideal filter, a non-ideal aluminium pinhole filter was calibrated for further use. A model was drawn-up and the required parameters were determined, including Si(Li) crystal depth, solid angle, beam energy and an STIM area mass density map.
|Number of pages||5|
|Journal||Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms|
|Publication status||Published - 2000|
Quaedackers, J. A., Brands, P. J. M., Rokita, E., IJzendoorn, van, L. J., Mutsaers, P. H. A., & de Goeij, J. J. M. (2000). Calibration procedure for pinhole filters for PIXE analysis. Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 161-163, 882-886. https://doi.org/10.1016/S0168-583X(99)00766-1