Abstract
X-ray fluorescence with high-energy photon excitation is a promising method for heavy element analysis. For trace determination, however, it is necessary to optimize the excitation spectrum. In this study, quasi monochromatization by a primary-beam filter and by a secondary target is quantitatively studied in order to detect an important bioelement, iodine, in an environmental sample. The primary-beam-filter technique gives the lowest detection limit, which is 1/5th the limit given by white excitation.
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