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Journal Articles

Estimation of the activity median aerodynamic diameter of plutonium particles using image analysis

Takasaki, Koji; Yasumune, Takashi; Yamaguchi, Yukako; Hashimoto, Makoto; Maeda, Koji; Kato, Masato

Journal of Nuclear Science and Technology, 60(11), p.1437 - 1446, 2023/11

https://doi.org/10.1080/00223131.2023.2196969
 Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)

The aerodynamic radioactive median diameter (AMAD) is necessary information to assess the internal exposure. On June 6, 2017, at a plutonium handling facility in Oarai site of Japan Atomic Energy Agency (JAEA), during the inspection work of a storage container that contains nuclear fuel materials, accidental contamination occurred and five workers inhaled radioactive materials including plutonium. Some smear papers and an air sampling filter were measured with the imaging plate, and we conservatively estimated minimum AMADs for two cases, plutonium nitrate and plutonium dioxide. As a result of AMAD estimation, even excluding a giant particle of a smear sample, the minimum AMADs of plutonium nitrate from smear papers were 4.3 - 11.3 $$mu$$m and those of plutonium dioxide were 5.6 - 14.1 $$mu$$m. Also, the minimum AMAD of plutonium nitrate from an air sampling filter was 3.0 $$mu$$m and that of plutonium dioxide was 3.9 $$mu$$m.

Journal Articles

Electronic structure of aluminium trihydride studied using soft X-ray emission and absorption spectroscopy

Takeda, Yukiharu; Saito, Yuji; Saito, Hiroyuki; Machida, Akihiko; Aoki, Katsutoshi; Yamagami, Hiroshi; Muro, Takayuki*; Kato, Yukako*; Kinoshita, Toyohiko*

Physical Review B, 84(15), p.153102_1 - 153102_4, 2011/10

https://doi.org/10.1103/PhysRevB.84.153102
 Times Cited Count：7 Percentile：32.89(Materials Science, Multidisciplinary)

We have performed soft X-ray emission spectroscopy (SXES) and soft X-ray absorption spectroscopy (SXAS) experiments on aluminum hydride $${alpha}$$-AlH$$_{3}$$. The occupied and unoccupied electronic states of the Al 3$$p$$ partial density of states are obtained experimentally. By comparing the data from Al metal and $${alpha}$$-AlH$$_{3}$$, a band gap with a few eV is found for $${alpha}$$-AlH$$_{3}$$. In addition, the occupied states of $${alpha}$$-AlH$$_{3}$$ have a larger spectral intensity than that of Al metal, indicating an increase in the number of electrons with the Al 3$$p$$ character through Al-H bond formations. The results of a band-structure calculation account for the formation of the energy gap and the increase of the Al 3$$p$$ electrons qualitatively. This suggests that a covalent-like nature is important to the Al-H bond in $${alpha}$$-AlH$$_{3}$$.

Journal Articles

Electronic structure of lithium amide

Kamakura, Nozomu; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Tsubota, Masami*; Paik, B.*; Ichikawa, Takayuki*; Kojima, Yoshitsugu*; Muro, Takayuki*; Kato, Yukako*; et al.

Physical Review B, 83(3), p.033103_1 - 033103_4, 2011/01

https://doi.org/10.1103/PhysRevB.83.033103
 Times Cited Count：5 Percentile：25.35(Materials Science, Multidisciplinary)

The electronic structure of lithium amide, which is lightweight complex hydride expected as a high-capacity hydrogen storage material, is investigated by N 1$$s$$ soft X-ray emission spectroscopy (XES) and absorption spectroscopy (XAS). The overall feature of the electronic structure of lithium amide by the XES and XAS is consistent with the band calculation, while the strongly hybridized state with H 1$$s$$ is located at higher binding energy than the band calculation.

Journal Articles

Atomic stereophotograph of intercalation compound Fe$$_{1/3}$$NbS$$_{2}$$

Guo, F. Z.*; Matsushita, Tomohiro*; Kobayashi, Keisuke*; Matsui, Fumihiko*; Kato, Yukako*; Daimon, Hiroshi*; Koyano, Mikio*; Yamamura, Yasuhisa*; Tsuji, Toshihide*; Saito, Yuji

Journal of Applied Physics, 99(2), p.024907_1 - 024907_3, 2006/01

https://doi.org/10.1063/1.2163995
 Times Cited Count：8 Percentile：31.28(Physics, Applied)

Stereoatomscope was used to study the atomic arrangements of intercalation compound Fe$$_{1/3}$$NbS$$_{2}$$. The three-dimensional atomic arrangements around different kinds of atoms (Nb and Fe) are visualized by taking the photoelectron angular distribution (PEAD) patterns at clockwise and counterclockwise circularly polarized lights. Atomic distances between the emitters and the scatterers are obtained from the PEAD patterns by measuring the rotation angles of the forward focusing peaks. The applications of stereoatomscope to intercalation compound show the possibility to build an ultimate microscope for scientist.

Oral presentation

Photoelectron and auger electron holograph of Cu(001) by 2D-PES

Matsushita, Tomohiro*; Guo, F. Z.*; Agui, Akane; Kato, Yukako*; Matsui, Fumihiko*; Daimon, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Study of the electronic states of AlH$$_{3}$$ by soft X-ray emission spectroscopy

Takeda, Yukiharu; Okane, Tetsuo; Fujimori, Shinichi; Yasui, Akira; Saito, Yuji; Yamagami, Hiroshi; Saito, Hiroyuki; Muro, Takayuki*; Kato, Yukako*; Kinoshita, Toyohiko*

no journal, , 

no abstracts in English

Oral presentation

Study of the electronic structure of AlH$$_{3}$$ using soft X-ray emission and absorption spectroscopy

Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Saito, Hiroyuki; Machida, Akihiko; Aoki, Katsutoshi; Muro, Takayuki*; Kato, Yukako*; Kinoshita, Toyohiko*

no journal, , 

no abstracts in English

7 (Records 1-7 displayed on this page)
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