THE TRITIUM MONITORING OF PRECIPITATION AND DATING OF GROUNDWATER IN KOREA

The tritium level of the precipitation in Korea is monitored at the Po hang Station from 1961 to 1976 and at the KAERI from 1981 to 1994. The tritium contents of the precipitation were recorded to about 1,300TU owing to world-wide nuclear devices in 1963. The tritium contents of p recipitation, surface water, groundwater, and sea water in 1991 are 10 TU, 14TU, 15TU, and 4TU, respectively. The tritium content tends to in crease from Cheju Island (14TU) to Baekdu Mt. (48TU). This shows that the tritium contents increase with latitude and are effected by the al titude. The tritium contents of surface water, groundwater, and discha rged water from heavy water-type nuclear power plant are measured high er than natural level. The tritium contents of discharged water from t he fracture zone of the horizontal tunnel in the Chungyang area are an alyzed. The data of tritium contents are applied to dating of groundwa ter by PFM and EM. The tritium contents of precipitation monitored wer e available as input data for dating of groundwater. Results of dating of groundwater are from about 14 year to 20 years.