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Wang, H.*; Miyatake, Hiroari*; Oba, Hironori; Saeki, Morihisa; Miyabe, Masabumi; Shibata, Takemasa; Iimura, Hideki
Review of Scientific Instruments, 75(10), p.3775 - 3776, 2004/10
Times Cited Count：1 Percentile：10.3(Instruments & Instrumentation)Laser-induced fluorescence spectroscopy has been employed to characterize a plume produced in nanosecond laser ablation of metallic neodymium. Kinetic energy distributions of ions and neutrals in the plume were investigated as functions of processing parameters such as laser fluence and ambient gas pressure. Population distributions of metastable levels in the ablated atoms were also measured. These investigations provide useful data for the design of a new types of resonance photo-ionization ion source and also for high-resolution laser spectroscopy.
Tamura, Koji
Shinku, 47(6), p.477 - 479, 2004/06
The lateral distributions of the laser photoionized neodymium ion at the ion energy between 1400eV and 300eV were measured with a multi-channel Faraday cup. The obtained ions were collimated within these energy regions, and are considered to be useful for the applications of the laser photoionized ions.
Tamura, Koji
Japanese Journal of Applied Physics, Part 1, 41(9), p.5845 - 5848, 2002/09
Times Cited Count：3 Percentile：15.64(Physics, Applied)The collimation properties of a Neodymium ion beam extracted from a laser photoionized plasma were measured by scanning a multichannel Faraday cup. The ion beam was collimated at the position of the Faraday cup by the electric field produced with a pair of semispherical electrodes set at the extraction electrode. The central ion beam intensity was increased about 36 times. The results were useful for the applications of laser photoionized ion source.
Tamura, Koji
Shinku, 45(3), p.255 - 257, 2002/03
For the application of laser photoionized ion beam, intensity distribution of extracted ions was measured with a multi-channel Faraday cup. In order to suppress beam divergence, hemi-cylindrical electrodes for collimation were used, and the lateral divergence of the ion beam was reduced. With hemi-spherical electrodes, lateral and vertical divergence was also reduced, and the central beam intensity was increased.
Tamura, Koji
Japanese Journal of Applied Physics, Part 1, 41(1), p.405 - 409, 2002/01
Times Cited Count：2 Percentile：10.8(Physics, Applied)The intensity distributions of a neodymium ion beam from laser photoionized plasma were measured by scanning a multichannel Faraday cup. The lateral width of ions at the position of the Faraday cup, which was broad without any additional electric field, was reduced by the additional concentric potential with a pair of semicylindrical electrodes set outside of the extraction electrode. The central ion beam intensity increased by about two times with these electrodes. These results were useful for the application of the laser photoionized ion beam.
Kitamura, Akira; *
JNC TN8400 2001-009, 54 Pages, 2001/01
Spectroscopic measurements of neodymium(III) and samarium(III) were carried out by spectrophotometer and laser-induced photoacoustic spectroscopic (LPAS) system for the investigation of the detection limit of both systems. The absorption spectra and photoacoustic spectra of Nd
and Sm were obtained with varying the concentration of the ions from 2
10
to 210
mol
dm
. The absorption spectrum of Nd was also determined by a special spectrophotometer, of which the measurement cell was set in a glove box filled with inert nitrogen gas. For the comparison with these photoacoustic and absorption spectra, the absorption spectra of Nd and Sm were determined by an usual spectrophotometer with the light-path lengths of 1 cm and 10 cm. The detection limit of the photoacoustic measurement was reported much lower than that of absorbance measurement by several researchers. However, the present study was concluded that the detection limit of photoacoustic measurement with the present LPAS system was similar to that of absorbance measurement with the light-path length of 10 cm. The detection limits of neptunium(IV,V) were estimated and the possibility of the speciation of neptunium(IV) was discussed from the results of the present study.
Jitsukata, Shu*; *; ; ; Kurosawa, A.
JNC TN8410 2001-002, 66 Pages, 2000/12
JNC-TN8410-2001-002.pdf:2.03MB
It was required from IAEA to determine a small amount of plutonium in the high active liquid waste solutions (HALW) in the tokai reprocessing plant. High performance spectrophotometer (HPSP), which could be obtained lower detection limit than conventional spectrophotometer, is studied to be applied to the inspection and verification analysis by the IAEA. [Cold Test] Neodymium, showing an absorption peak near the absorption wavelength of plutonium (VI), was used as an alternative element to plutonium, in order to review the calculation method of the peak intensity. As a result, the three-point correction method was found to be simple and effective. [Hot Test] Plutonium nitrate solution was used the fundamental test of this method. Since the method is known to be influenced by acidity, suspended sludge and coexistent elements in a sample, each dependency was examined. It was found that measurement results varied about 14% at a nitric acid concentration of 2-4 mol/L. Sludge should be removed by filtration before the measurement. The effect of coexisting elements could be eliminated adjusting the optical balance between reference and sample beam intensity. In the case of measuring a low concentration plutonium solution sample, a ratio of the peak intensity to the background intensity (S/B ratio) is relatively small. Therefore a method should be improved the S/B ratio by analyzing the obtained spectra. Accumulated average method, moving average method and Fourier transform method was tested. The results showed that a combination of the accumulated average method and the moving average method was the optimum method for the purpose. Linearity of the calibration curve was found between 0-11 mgPu/L. Synthetic sample solution, which simulated the actual constituents of the HALW with plutonium showed a good linear relation at 0-11 mgPu/L. The detection limit for plutonium concentration was 0.07 mgPu/L. When the synthetic HALW solution containing plutonium was measured, the de
Oda, Yoshihiro; Funasaka, Hideyuki; Wang, X.*; Obara, Kenji*; Wada, Hitoshi*
JNC TY8400 2000-002, 47 Pages, 2000/03
JNC-TY8400-2000-002.pdf:2.53MB
no abstracts in English
Tamura, Koji; Arisawa, Takashi
JAERI-Tech 99-058, 13 Pages, 1999/08
no abstracts in English
Shibata, Takemasa; Ogura, Koichi
JAERI-Research 99-008, 10 Pages, 1999/02
JAERI-Research-99-008.pdf:0.86MB
no abstracts in English
Nagano, Tetsushi; Mitamura, Hisayoshi; Nakayama, Shinichi; Nakashima, Satoru*
Clays and Clay Minerals, 47(6), p.748 - 754, 1999/00
Times Cited Count：16 Percentile：44.62(Chemistry, Physical)no abstracts in English
Tamura, Koji; Ogura, Koichi; Shibata, Takemasa
Japanese Journal of Applied Physics, Part 1, 37(9A), p.5005 - 5007, 1998/09
Times Cited Count：6 Percentile：32.57(Physics, Applied)no abstracts in English
Adachi, Hajime; Tamura, Koji; ; Shibata, Takemasa
JAERI-Tech 98-029, 32 Pages, 1998/08
no abstracts in English
Kimura, Takaumi; Kato, Yoshiharu
Journal of Alloys and Compounds, 271-273, p.867 - 871, 1998/00
Times Cited Count：67 Percentile：92.55(Chemistry, Physical)no abstracts in English
*
PNC TJ9607 97-001, 64 Pages, 1997/03
When minor actinides (MA) are returned to a core of fast breeder reactor for tbe purpose of incineration of them, rare earth nuclides and so on (RE) are also returned to the core because the separation of MA from RE is difficult at present. Then, accurate neutron cross section data of RE become necessary for investigating the characteristics of the core. Therefore, the measurement of keV-neutron capture cross sections of 
Nd and 
Nd were performed to obtain tbe accurate data. The measurement was relative to the standard capture cross sections of 
Au. A neutron time-of-flight method was adopted witb a ns-pulsed neutron source by a Pelletron accelerator and a large anti-Compton Nal(T1) gamma-ray detector. As a result, the capture cross sections of those nuclides were obtained with the error of about 4 % in an incident neutron energy region of 10 to 560 keV. A comparison between the present data and the evaluated values of JENDL-3.2 showed tbat JENDL-3.2 provided good evaluations for Nd, but underestimated the capture cross sections of 
Nd by 10-20 % at neutron energies below 30 keV and overestimated them by about 20 % at 560 keV, whereas it provided good evaluations in the energy region of 40-70 keV. The discrepancy is caused by the weak dependency of evaluated cross sections on the incident neutron energy.
; Shibata, Takemasa
JAERI-Tech 97-011, 14 Pages, 1997/03
no abstracts in English
*; *; *; Ogura, Koichi; Shibata, Takemasa
JAERI-Research 97-025, 36 Pages, 1997/03
JAERI-Research-97-025.pdf:1.04MB
no abstracts in English
Shibata, Takemasa; Ogura, Koichi;
Shinku, 40(8), p.668 - 670, 1997/00
no abstracts in English
, Nd and Eu on titanium antimonate and their chromatographic separation; Morita, Yasuji; Kubota, Masumitsu; *
Radiochimica Acta, 75, p.27 - 32, 1996/00
no abstracts in English
Shibata, Takemasa; Ogura, Koichi
Journal of the Physical Society of Japan, 64(9), p.3136 - 3140, 1995/09
Times Cited Count：5 Percentile：64.46(Physics, Multidisciplinary)no abstracts in English
