ORIGINAL ARTICLES
CHIME monazite dating: Pb analysis on an RR = 100 mm spectrometer and correction of interferences between Th, U, and Pb with natural monazite
2017 年 112 巻 2 号 p. 88-96
詳細
2017 年 112 巻 2 号 p. 88-96
This paper outlines an advanced procedure involving the chemical Th–U–total Pb isochron method (CHIME) dating of monazite using a field–emission electron probe microanalyzer (FE–EPMA) equipped with spectrometers of 100 mm Rowland circle (RR) radius. The higher count rate of RR = 100 mm wavelength dispersive spectrometer (WDS) compared to RR = 140 mm WDS enables measurements to be taken in a shorter time. CHIME dating using RR = 100 mm WDS had previously been difficult because of lower resolution compared to that of RR = 140 mm WDS. This problem has been overcome by a new interference correction method using natural monazites.
