Abstract
Analytical method for technetium-99 in liquid effluent was investigated and had been applied for measurement of liquid effluents discharged from the Tokai reprocessing plant in Japan. The quarterly averaged concentrations of 99Tc in liquid effluents from 1990 to 2000 were ranged from N.D. (<5 × 10-7 Bq·cm-3) to 6.7 × 10-5 Bq·cm-3. The average of the normalized annual release of 99Tc was 7.4 × 10-4 GBq· (GWa) -1 and it was approximately one fiftyfifth of Iodine-129, which was one of the typical nuclides to have difficulty to remove from liquid effluent. The committed effective dose by intake of seaweed was evaluated to be less than 3 × 10-10 mSv·a-1.
