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methodSuzuki, Satoshi*; Komatsuzaki, Takashi*; Tadokoro, Hideaki*; Oki, Koichi
JAEA-Review 2011-039, 74 Pages, 2012/01
JAEA-Review-2011-039.pdf:2.6MB
This report summarizes outline, methods and measurement results of actual wastes of nondestructive measurement system using the passive method applied to the evaluation of the quantity of uranium in the drum waste (0.2 m
) and container waste (1 m). The following are the results. (1) The measurement number of drum wastes was 18,884 (4,703 of the number were pit wastes), at the end of March, 2011. (2) The measurement number of container wastes was 749 (110 of the number were pit wastes), at the end of March, 2011. (3) About 60% of drum wastes and about 80% of container wastes were metal and concrete. (4) 75% of drum wastes were less than detection limit, and average of radioactivity is 3.4 Bq (U-238)/g. Then 17% of container wastes were less than detection limit, and average of radioactivity is 2.3 Bq (U-238)/g. (5) If clearance level is 1.0 Bq (U-238)/g (IAEA RS-G-1.7), about 80% of wastes are below the clearance level.
Suzuki, Satoshi*; Komatsuzaki, Takashi*; Sukegawa, Yasuhiro*; Oki, Koichi
JAEA-Technology 2010-035, 134 Pages, 2010/09
JAEA-Technology-2010-035.pdf:22.59MB
It is important in the waste management to evaluate the quantity of radioactivity in the wastes. This report summarizes the improvement, examinations in the nondestructive measurement system using the passive method applied to the evaluation of the quantity of uranium in container waste. Results are followings. (1) Evaluation of the quantity of uranium in container waste was about 
50% against true value. (2) Repeatedly accuracy of the evaluation value is about 50%. (3) The validity of the evaluation to container wastes was confirmed by cross-checking with the system for the drum. (4) When the radioactivity is higher than 1 Bq/g, the facing couple method is effective. (5) If the weight of container is 1t, the detection limit by NaI detector is about 20g (U-238) at the center of container, 3g (U-238) at the surface. Detection limit by Ge detector is about 70g (U-238) at the center, 10g (U-238) at the surface. (6) There is a possibility that about 80% of the container wastes become clearance wastes.
Oki, Koichi; Ishibashi, Yuzo; Muto, Katsumi; Komatsuzaki, Takashi*; Suzuki, Satoshi*; Sukegawa, Yasuhiro*
no journal, ,
no abstracts in English