Alpha-ray measurement of dissolved plutonium particle on the TIMS filament

Yasuda, Kenichiro   ; Suzuki, Daisuke   ; Kanazawa, Kazuhito; Miyamoto, Yutaka   ; Esaka, Fumitaka  ; Magara, Masaaki  

In order to detect of undeclared activities in nuclear facilities, we develop to technique of safeguards environmental sample analysis in JAEA. As part of this effort, isotope ratio analysis of individual MOX particle was performed using by TIMS without chemical treatment. It is possible to estimate an age determination of plutonium purification by a combination of the plutonium isotope ratios and (Pu-238+Am-241)/(Pu-239+Pu-240) alpha activity ratios were obtained by the alpha spectrometry. Since the plutonium particle size is more than 1m due to the influence of self-absorption, exactly measurement of the activity ratios has been difficult. Therefore, we were examining how to acid dissolution in the plutonium particles on the TIMS filament before alpha spectrometry.