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- W2487626111 abstract "Abstract The following study describes the experimental results obtained by energy dispersive x-ray analysis on a series of representative samples, concentrated by precipitation, to spots 1.5 mm in diameter on Millipore (R) membranes. Using modified detector collimation, the contributions of air scatter and membrane (Substrate) scatter to the background under a peak, can be minimized to achieve limits of detection approaching a nanogram of the element present in the precipitate. The equipment used here is composed of an 80 mm 2 Si(Li) detector connected to a computer based data handling unit. Excitation was achieved with a Rhodium target x-ray tube having a maximum output of 50 kV at 5.0 ma. Even with the high detection efficiency of the Si(Li) detector and the capability of minimizing the source to sample and sample to detector pauh lengths, it was found with these samples that at least 3.0 ma of tube current is needed in the excitation source. A mechanism has been developed for this work that allows reproducible sample positioning for standards and unknowns. This mechanism is used to produce element profiles on larger precipitated standards to measure radial uniformity." @default.
- W2487626111 created "2016-08-23" @default.
- W2487626111 creator A5080426854 @default.
- W2487626111 date "1973-01-01" @default.
- W2487626111 modified "2023-09-26" @default.
- W2487626111 title "Quantification of Sub-Microgram Elemental Concentrations Using Micro-Dot Samples" @default.
- W2487626111 cites W2051616453 @default.
- W2487626111 doi "https://doi.org/10.1154/s0376030800005383" @default.
- W2487626111 hasPublicationYear "1973" @default.
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