Abstract
The thorium content of quartz glass tubing was found to vary greatly from very low values (<5 ng Th/g) to about 300 ng Th/g. When trace amounts of thorium are to be determined by activation analysis, e.g. in excreta, thorium content of quartz glass irradiation vials has to be taken into consideration. Analysis of fecal ash samples from persons living in the Vienna area who were not occupationally exposed to thorium containing dust, gave thorium excretion rates in feces of 0.5 to 8 μg per day. For occupationally exposed persons some of the values were much higher, up to 70 μg per day.
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