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Journal Articles

Silicon isotope separation utilizing infrared multiphoton dissociation of Si $_{2}$ F $_{6}$ irradiated with two-frequency CO $_{2}$ laser lights

Yokoyama, Atsushi; Oba, Hironori; Hashimoto, Masashi; Katsumata, Keiichi; Akagi, Hiroshi; Ishii, Takeshi*; Oya, Akio*; Arai, Shigeyoshi*

Applied Physics B, 79(7), p.883 - 889, 2004/11

https://doi.org/10.1007/s00340-004-1642-z

Times Cited Count：9 Percentile：42.05(Optics)

Silicon isotope separation has been done utilizing the Infrared Multiphoton Dissociation of Si $_{2}$ F $_{6}$ irradiated with two-frequency CO $_{2}$ laser lights. The two-frequency excitation method improved the separation efficiency with keeping the high enrichment factors. For example, Si $_{2}$ F $_{6}$ with the $^{28}$ Si fraction of 99.4 % was obtained at 40.0 % dissociation of Si $_{2}$ F $_{6}$ after the simultaneous irradiation of 100 pulses with 966.23 cm $^{-1}$ photons (0.089 J/cm $^{2}$ ) and 954.55 cm $^{-1}$ photons (0.92 J/cm $^{2}$ ), while 1000 pulses were needed to obtain 99.0 % of $^{28}$ Si at 27.2 % dissociation in the case of single frequency irradiation at 954.55 cm $^{-1}$ (0.92 J/cm $^{2}$ ). The single-step enrichment factors of $^{29}$ Si and $^{30}$ Si increased with increasing Si $_{2}$ F $_{6}$ pressure. The reason for this enhancement has been discussed in terms of the rotational and vibrational relaxations by collisions with ambient gases.

JAEA Reports

Numerical analysis of fractional distillation characteristics for radioactive metallic waste

Akaoka, Katsuaki; Maruyama, Yoichiro

JAERI-Research 2004-012, 12 Pages, 2004/08

JAERI-Research-2004-012.pdf:3.52MB

The fractional distillation characteristics at between 0 $^{circ}$ C and 2500 $^{circ}$ C(the rate is 200 $^{circ}$ C/h) of radioactive metallic waste for JPDR which mainly consists of stainless steel were analyzed numerically. In the simulation, the vaporization rates of the components of JPDR waste were calculated by using the Langmuir's equation and Henry's law. As the results, it was calculated that $^{152,154}$ Eu, $^{14}$ C and $^{94}$ Nb can be removed by the fractional distillation. On the other hand, $^{54}$ Mn and $^{55}$ Fe can be reduced by cooling them for about 30 years. Therefore, by removing $^{59,63}$ Ni and $^{60}$ Co using laser separation method, it will be possible to reduce the radioactive metallic waste by less than one one-hundredth.

JAEA Reports

Research of vacuum distillation for metals; Elemental separation of duralumin

Akaoka, Katsuaki; Maruyama, Yoichiro

JAERI-Research 2003-022, 16 Pages, 2003/10

JAERI-Research-2003-022.pdf:1.56MB

We measured and simulated the characteristics of vacuum distillation for duralumin (Aluminum alloy 7075: Al-5.6Zn-2.5Mg-1.6Cu-0.25Cr). In the experiment, the duralumin (378.7 mg) was heated to 1500 $^{circ}$ C (the rate is 200 $^{circ}$ C/hour) and vaporized. The ion current of components within the vapor using mass spectrometer was measured. In the simulation, the vaporization rate of components within vapor was calculated by using the formula of Langmuir and the law of Raoult. The simulation agreed well with the experiment, and it was found that the group of Al, Cu and Cr, and the group of Mg and Zn could be separated by the vacuum distillation.These results show that the radioactive wastes can be reduced using the vacuum distillation.

Journal Articles

High enrichment of $^{28}$ Si by infrared multiple photon decomposition of Si $_{2}$ F $_{6}$

Yokoyama, Atsushi; Oba, Hironori; Shibata, Takemasa; Kawanishi, Shunichi*; Sugimoto, Shunichi*; Ishii, Takeshi*; Oya, Akio*; Miyamoto, Yoshiki*; Isomura, Shohei*; Arai, Shigeyoshi*

Journal of Nuclear Science and Technology, 39(4), p.457 - 462, 2002/04

https://doi.org/10.3327/jnst.39.457

Times Cited Count：2 Percentile：17.03(Nuclear Science & Technology)

no abstracts in English

Journal Articles