Abstract
Absolute spectral reflectance of barium sulfate specimens was measured by a single integrating sphere method similar to that developed by Budde and Dodd. Barium sulfate specimens were prepared by us in 1976 and calibrated by Budde in 1976 and by Mishima in 1979, and since then they were stored on a dark shelf. Both average absolute spectral reflectance and coefficient of variation were calculated down to 240 nm. The coefficient of variation was 0.4-0.6% within a visible region and 3% at 240 nm. The average reflectance of pure barium sulfate was approximately equal to the data of Budde, and the significant difference was not observed between them. The reflectance of barium sulfate containing 0.2% poly (vinyl alcohol) as binder was somewhat deteriorated in the ultraviolet region, and the difference of reflectance caused by the setting position of specimen to the sample port of integrating sphere was observed. It is concluded that barium sulfate containing poly (vinyl alcohol) binder is not adequate as reflerence material for relative reflectance measurement.
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