Development of low-cost simple dead time correction system for accurate quantitative electron probe microanalysis (EPMA) of trace element

Takenori Kato

Presentation information

Oral

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG56] Petrology, Mineralogy and Resource Geology

Thu. May 26, 2016 1:45 PM - 3:15 PM 201B (2F)

Convener:*Tatsuo Nozaki(Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology), Akira Miyake(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Nobutaka Tsuchiya(Department of Geology, Faculty of Education, Iwate University), Satoshi SAITO(Graduate School of Science and Engineering, Ehime University), Chair:Tatsuo Nozaki(Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology), Akira Miyake(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University)

2:00 PM - 2:15 PM

[SCG56-10] Development of low-cost simple dead time correction system for accurate quantitative electron probe microanalysis (EPMA) of trace element

*Takenori Kato¹ (1.Institute for Space-Earth Environmental Research, Nagoya University)

Keywords:Electron probe microanalysis (EPMA), Dead time correction, X-ray spectrometry, Wavelength dispersive spectrometer (WDS), Proportional counter

High-current and long-time X-ray sampling is required in quantitative electron probe microanalysis of trace elements. The X-ray count rate becomes extremely high in case of standard materials measurement at high-current. In this case, accuracy of dead time correction is an important factor to accurate quantitative EPMA of trace elements.
To achieve long-time maintenance-free stable dead time correction in quantitative EPMA, a simple pseudo-fixed dead time system has been developed. The mono-stable multivibrator is inserted after single-channel analyzer (SCA) / pulse-height analyzer (PHA). The dead time of this design can be considered to be a fixed value when the count rate is bellow 200kcps. The relative error in this system is smaller than 0.5%.