Environmental monitoring after remediation activity at old uranium mine site

Ishimori, Yuu  ; Tanaka, Hiroshi ; Sakoda, Akihiro   

This paper illustrates environmental monitoring results in and around an old uranium mine site remediated by the Japan Atomic Energy Agency (JAEA). The site remediated is the waste rock site located on the steep slope of a hill about 1.5 km upstream from a residential area along a main ravine. Major remedial action was performed by covering the waste rock yards with weathering granite soil. Radon exhalation rate, radon concentration and -ray dose rate are mainly discussed. These measurements were carried out at about 30, 50 and 3300 points, respectively. These results prove that soil cover keeps its function over 5 years. In addition, environmental impact from the site has been negligible before the action.