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JAEA Reports

Re-Evaluation of a Method for Monitoring Airborne$$^{14}$$C Discharge and its Contribution to Development of an Advanced Method

Koarashi, Jun; Isaka, Keisuke*; Yokota, Tomokazu*; Kozawa, Tomoyasu*; Mikami, Satoshi; Kiyomitsu, Akiyama,; Kobayashi, Hirohide

JNC-TN8410 2005-005, 55 Pages, 2005/05

JNC-TN8410-2005-005.pdf:2.0MB

Some investigations were made for re-evaluating collection and measurement techniques in an airborne $$^{14}$$C discharge monitoring at the Tokai reprocessing plant (TRP), which include (1)collection efficiency of CO$$_{2}$$ in a carbon sampler using monoethanolamine as CO$$_{2}$$ absorbent;(2)affect of incorporating tritiated water into the carbon sampler on quantitative estimation of $$^{14}$$C activity in airborne effluent; (3)affect of leakage in air sampling on evaluating airborne $$^{14}$$C discharge; and (4)determination of chemical forms of $$^{14}$$C in airborne release from the TRP. The results presented not only the validity of the TRP's monitoring method, but also the technical aspects required for establishing a more reliable and effective monitoring method.

JAEA Reports

Re-Evaluation of a Method for Monitoring Airborne$$^{3}$$H Discharge and its Contribution to Development of an Advanced Method

Koarashi, Jun; Yokota, Tomokazu*; Kozawa, Tomoyasu*; Isaka, Keisuke*; Mikami, Satoshi; Kiyomitsu, Akiyama,; Kobayashi, Hirohide

JNC-TN8410 2005-004, 73 Pages, 2005/05

JNC-TN8410-2005-004.pdf:2.48MB

Some investigations were made for re-evaluating collection and measurement techniques in an airborn $$^{3}$$H discharge monitoring at the Tokai reprocessing plant (TRP), which include (1)collection efficiency of water in a tritium sampler; (2)quench correction in $$^{3}$$H activity measurement by liquid scintillation counting; (3)affect of leakage in air sampling on evaluating airborne $$^{3}$$H discharge; and (4)determination of chemical forms of $$^{3}$$H in airborne release from the TRP. The results presented not only the validity of the TRP's monitoring method, but also the technical aspects required for establishing a more reliable and effective monitoring method.

JAEA Reports

Methods and Their Performances for Collecting Tritium, Carbon-14 and Radioiodine in Airborne Effluent from Tokai Reprocessing Plant

Koarashi, Jun; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Isaka, Keisuke*; Kiyomitsu, Akiyama,; Asano, Tomohiro

JNC-TN8410 2004-003, 49 Pages, 2004/07

JNC-TN8410-2004-003.pdf:1.45MB

Radioactive airborne effluent discharged from Tokai reprocessing plant (TRP) contains tritium, carbon-14 and radioiodine. These radionuclides are collected with appropriate methods, respectively, in stacks to monitor their concentrations and discharged amounts. This report describes (1) the methods for collecting these radionuclides in TRP; (2) evaluations of the concentrations and discharged amounts; and (3) investigations on estimating performances of the collecting methods. The investigations showed that the collecting methods used in TRP have collecting efficiencies of more than 90% for tritium and radioiodine, and almost 100% for carbon-14. Considerations concerning collection of radionuclides in airborne effluent, made in this study, provided some technical aspects required for establishing more reliable monitoring systems.

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