QA/QC activities and estimation of uncertainty for ultra-trace analysis of uranium and plutonium in safeguards environmental samples

Usuda, Shigekazu*; Magara, Masaaki  ; Esaka, Fumitaka  ; Yasuda, Kenichiro   ; Kokubu, Yoko   ; Lee, C. G.; Miyamoto, Yutaka   ; Suzuki, Daisuke   ; Inagawa, Jun; Sakurai, Satoshi ; Murata, Fujio*

In order to keep and enhance the reliability of the measurement results, validation of analytical methods and estimation of measurement uncertainty in such ultra-trace analysis should be properly done in accordance with worldwide standards. the authors introduce current activities on achievement of QA/QC (quality assurance and quality control) and estimation of measurement uncertainty in isotopic analysis of the ultra-trace uranium and plutonium in environmental samples for safeguards at CLEAR (Clean Laboratory for Environmental Analysis and Research) of JAEA.