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Iguchi, Kazunari
Nihon Shashin Gakkai-Shi, 68(1), p.56 - 59, 2005/02
In order to detect undeclared activities of nuclear facilities, Japan Atomic Energy Research Institute (JAERI) has developed analytical methods for safeguards environmental samples. As for particle analysis of safeguards environmental sample analysis which can determine isotope ratios of nuclear materials for individual particles, secondary ion mass spectrometry (SIMS) is known as a powerful method. However, it is difficult to analyze particles having diameter below 1 
m due to its detection limit. To overcome the problem, JAERI is developing an analytical method using fission track (FT) technique. The outline of the method is described in this report.
Lee, C. G.; Iguchi, Kazunari; Inagawa, Jun; Suzuki, Daisuke; Esaka, Fumitaka; Magara, Masaaki; Sakurai, Satoshi; Watanabe, Kazuo; Usuda, Shigekazu
Dai-26-Kai Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Nenji Taikai Rombunshu, p.171 - 178, 2005/00
Particle analysis by FT-TIMS method is effective for safeguards environmental samples because the isotope ratios of sub-micrometer particles can be determined. The FT-TIMS method developed by the authors, in which the particles are confined in the detector, has merits such as high detection efficiency and the possibility as a screening method for uranium particles according to their enrichment by controlling the etching time. However, it was found that a part of uranium particles contained in a detector may dissolve during the etching process of the detector. In order to overcome the problem, we are developing a novel sample preparing method in which the FT detector and the particle layer are separated. In the conventional FT sample of separated type, the detection process of particles of interest is time-consuming and complicated due to the discrepancy in position between tracks and particles. In contrast, the discrepancy was solved by fixing a part of a detector and a particle layer in our method, which improved the detection efficiency of particles containing fissile materials.
Yasuda, Kenichiro; Suzuki, Daisuke; Miyamoto, Yutaka; Usami, Hidehiko*
no journal, ,
In safeguards environmental sample analysis, isotopic composition analysis of particles containing nuclear materials is an important technique for detecting undeclared activities at nuclear facilities. The alpha track and the fission track method are often used to detect the position of particles containing nuclear materials, but it has been difficult to use both methods on a sample because the track detector was deformed by the chemical etching. In this study, the alpha track and fission track methods were successfully applied to individual particles by correcting their positions by marking the track detector with a laser. Therefore, it was possible to classify differences in the amount and composition of nuclear material contained in the particles, and it is expected that the particles will be recovered efficiently.
Yasuda, Kenichiro; Suzuki, Daisuke; Tomita, Jumpei; Tomita, Ryohei; Miyamoto, Yutaka
no journal, ,
The safeguards environmental sample analysis by the IAEA requires the development of efficient methods for measuring isotope ratios of ultra-trace amounts of plutonium and uranium particles. We have applied fission track and alpha track techniques to identify of discrimination between plutonium and uranium particles and have successfully measured isotope ratios of the particles using a continuous heating method with a thermal ionization mass spectrometer (TIMS). This method made it possible to find particles containing plutonium and uranium and measure them simultaneously by the TIMS without a chemical separation.
