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Hosoma, Takashi; Mukai, Yasunobu; Tanaka, Hideki
STI/PUB/1298 (CD-ROM), p.699 - 705, 2007/08
Accurate measurement of density and volume by dip-tubes in an annular tank for plutonium nitrate solution is indispensable for material accountancy and safeguards in a reprocessing and conversion plant. The principle of this method is to measure true hydrostatic pressure at the tip of the tube, which postulates that solution in a tank is motionless during measurement. Such condition is satisfied by short time measurement for material accountancy. However, solution is normally being agitated continuously for safety reasons. Therefore, the solution flows and causes some fluctuation and possibly some small bias on hydrostatic pressure measurement. Continuous volume monitoring data is very important information for safeguards, but some apparent change in volume is observed due to the above situation. The reason of fluctuation and small bias is estimated that the effect of solution flow on pressure measurement is not compensating between the density tube (several millimeter higher than the bottom) and the level tube (close to the bottom where solution flow is stagnated), thus measured density fluctuates. In principle, measured volume decreases when measured density increases. We focused attention to the solution mass simply calculated by volume multiplied by density measured coincidentally. As a result, fluctuation and small bias is significantly reduced in mass monitoring.
Onizawa, Toshikazu; Kimura, Takashi; Kurosu, Kazutoshi; Hayakawa, Tsuyoshi; Fukuhara, Junichi; Yatsu, Shoichi*
STI/PUB/1298 (CD-ROM), p.739 - 745, 2007/08
no abstracts in English
Sakurai, Satoshi; Magara, Masaaki; Esaka, Fumitaka; Hirayama, Fumio; Lee, C. G.; Yasuda, Kenichiro; Inagawa, Jun; Suzuki, Daisuke; Iguchi, Kazunari; Kokubu, Yoko; et al.
STI/PUB/1298 (CD-ROM), p.791 - 799, 2007/08
no abstracts in English
Shinonaga, Taeko*; Donohue, D.*; Klose, D.*; Kuno, Takehiko*; Kuno, Yusuke*; Esaka, Fumitaka; Esaka, Konomi; Magara, Masaaki; Sakurai, Satoshi; Usuda, Shigekazu
STI/PUB/1298 (CD-ROM), p.525 - 531, 2007/08
More precise, accurate and prompt analyses of uranium and plutonium in various types of environmental samples are increasingly requested from the Clean Laboratory Unit, Safeguards Analytical Laboratory of IAEA in recent years. Particles show unique information and up to now, the secondary ion mass spectrometry (SIMS) has been employed for the uranium and plutonium particle analysis. The SIMS that is the most rapid method for particle analysis has, however, disadvantages for the analysis of the minor isotopes like 
U and 
U, i.e., not precise enough. The SIMS measurement also has a difficulty on Pu determination because of the interference of U-based isobaric signals. In this study, a combination of techniques, picking-up particles by a manipulator attached to a scanning electron microscope (SEM), followed by uranium and plutonium chemical purification and measurement by an inductively coupled plasma mass spectrometer (ICP-MS) and thermal ionization mass spectrometer (TIMS), was demonstrated for particle analysis using standard materials (NBS U500 and NBS 947) to develop a particle-chemical analysis.
Surugaya, Naoki; Taguchi, Shigeo; Kurosawa, Akira; Watahiki, Masaru
STI/PUB/1298 (CD-ROM), p.673 - 679, 2007/08
We have been analyzing nuclear materials at the Tokai pilot reprocessing plant, Japan, since 1977. To obtain reliable measurements for nuclear material such as uranium and plutonium, we have developed various kinds of measurement techniques and implemented effective ones for accountability and verification analyses in a nuclear material accountancy system. One of our role as a pilot plant has been successfully accomplished with the effort put into various analytical activities. Now, it is time to transfer the experience gained with our technology to the next large-scale commercial plant in Rokkasho. This paper presents our analytical methods and their results obtained using analytical techniques we have applied over recent years.