Development of a method for tritium measurement in ethylalcohol and application to individual component in Sake

We developed a method to analyze tritium activity in the individual compone nts of Japanese rice wine (Sake), i.e., aqueous and organic (alcohol). This method consists of a series of analytical procedures including fractionati on, alcohol-oxidation, tritium enrichment and radioactivity measurement. Sp ecialized fractionation and oxidation systems were designed and the operati on conditions were determined. The enrichment system and measurement method contained an electrolysis method using multiplate cells and liquid scintil lation analysis as previously described. In the first step of the pre-exami nation using ethylalcohol, the tritium content was measured within +/-5%. I n subsequent analyses, the tritium content was measured in Sake produced in 1990-1996. The tritium concentration in the aqueous component was consiste ntly higher in Sake produced in the northern regions (Hokkaido and Tohoku) than in the southern regions (Kyushu) and also higher in Sake produced in t he regions on the side of the Sea of Japan than that of the Pacific Ocean. However, this trend became less apparent with time. The tritium concentrati on in the organic component showed no relation to the area of production. I n general, the tritium level in this component was twice the aqueous compon ent.