論文
コンクリート中のクリアランスレベルのトリチウム濃度測定法
2007 年 6 巻 1 号 p. 58-64
詳細
2007 年 6 巻 1 号 p. 58-64
Applicability of a leaching method to measurement of a clearance level of tritium in concrete was investigated. Static leaching tests were performed for tritium doped concrete samples in water, and the fraction of leached tritium was determined as a function of leaching time. The fraction increased rapidly in initial few days. After 10 days, the rate of increment was slow down, and stopped after 30 days in which the leaching ratio was 95±3%. In the case of actual concrete samples obtained from Japan Research Reactor No. 3, the leaching behavior was the same as that of simulated samples. The radioactivity of tritium determined by the leaching method showed good agreement with that from heating method. The method to leach out tritium from concretes with water is considered applicable to the analysis of a clearance level of tritium.
