Influence of uranium enrichment on the etching rate of polycarbonate fission track detector containing uranium particles

Lee, C. G.; Iguchi, Kazunari; Esaka, Fumitaka; Magara, Masaaki; Sakurai, Satoshi; Watanabe, Kazuo; Usuda, Shigekazu

Nuclear Instruments and Methods in Physics Research B, 245(2), p.440 - 444, 2006/04

https://doi.org/10.1016/j.nimb.2005.11.002

The etching rates of fission track detectors made of polycarbonate containing uranium particles were measured after thermal neutron irradiation with fluence of 810 n/cm, in order to study the influence of uranium enrichment on the etching rate that was calculated from the weight loss by etching. There is a strong correlation between the etching rate of detector and the enrichment E of uranium particle: the former increases as the latter increases. Particularly, the etching rate per particle was proportional to E rather than E, which is probably due to the overlapping of fission tracks. The etching behaviors of detector revealed that the existence of two different etching rate regions, a nonlinear region in the beginning of etching process and a subsequent constant region, which was explained as the opening of fission tracks and the broadening of opened tracks, respectively.

Role of UV light illumination and DMF soaking in production of PET ion track membranes

Zhu, Z.; Maekawa, Yasunari; Koshikawa, Hiroshi; Suzuki, Yasuyuki; Yonezawa, Noriyuki*; Yoshida, Masaru

Nuclear Instruments and Methods in Physics Research B, 217(3), p.449 - 456, 2004/05

https://doi.org/10.1016/j.nimb.2003.11.011

The pretreatment effects using UV light illumination and DMF soaking on bulk and track etching rates of PET films were investigated. The wavelength of illuminated UV light plays an important role in sensitizing track etching. Illumination with the light at wavelengths longer than 320nm showed strong enhancement in the track etching rates without influence on the bulk etching rates, whereas light with the wavelengths lower than 320nm causes large enhancement in both track and bulk etching rates even in the interior of the material. The track etching rate is found to be not constant along ion tracks, which is attributed to the inhomogeneous distribution of reactive chemical species induced during post-UV light illumination. Furthermore, the DMF soaking of PET after UV light illumination can enhance the etching sensitivity of the track by more than 100 times. The phenomenon is attributed to the high diffusion of organic solution along tracks after UV light illumination.

Nd:YVO and YVO laser crystal integration by a direct bonding technique

Sugiyama, Akira; Fukuyama, Hiroyasu; Katsumata, Masaki*; Okada, Yukikatsu*

Integrated Optical Devices: Fabrication and Testing (Proceedings of SPIE Vol.4944), p.361 - 368, 2003/00

We report recent progress in bonding of crystals used in microchip lasers, Nd:YVO and non-doped YVO crystal that functions as a cold finger. The bonding technique consists of a dry etching process for polished crystal surfaces to be bonded and a successive transformation from hydrogen bonding to oxygen-bridged bonding at temperature below half of the melting point of crystal. Roughness of the surfaces was less than 0.2-lambda at 633 nm. After the etching of around 30 nm by an argon ion beam, the surfaces were contacted in the clean ambient, then heat treatment was done for 50 hours in a vacuum furnace. To evaluate the bonded region, we made optical scattering measurements, and laser oscillation tests pumped by a laser diode with the output power of 20 W. From these experiments, it was clear that the number of defects on the bonded surface is much smaller than that of the intrinsic defects, and the integrated crystal, improving thermal conductivity, can produce twice of laser output power compared with a usual one.

Large coherent structure formation by magnetic stretching term in two-dimensional MHD turbulence

;

Journal of the Physical Society of Japan, 67(12), p.4302 - 4303, 1998/12

https://doi.org/10.1143/JPSJ.67.4302

no abstracts in English

Elution of residual ions with etching of heavy ion-injected polyimide

Komaki, Yoshihide; ; Sakurai, Tsutomu; Matsumoto, Yasuyo*

Radiat. Meas., 23(4), p.725 - 729, 1994/00

https://doi.org/10.1016/1350-4487(94)90009-4

no abstracts in English

Observation of nuclear track development in polyvinylidene fluoride with several etchants

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J.Electron Microsc., 30(4), p.292 - 297, 1981/00

no abstracts in English

Chemical etching of fission tracks in polyfluoro plastic

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Science, 199(4327), p.421 - 422, 1978/00

https://doi.org/10.1126/science.199.4327.421

no abstracts in English

Electron microscopy of fine holes in polyethyleneterephthalate films irradiated by fission fragments

; ; Izui, Kazuhiko;

Journal of Applied Physics, 46(3), p.1155 - 1158, 1975/03

https://doi.org/10.1063/1.322216

no abstracts in English

Identification of dislocation in NaF crystals by electrolytic coloration and chemical etching

Journal of the Physical Society of Japan, 26(1), p.143 - 148, 1969/00

https://doi.org/10.1143/JPSJ.26.143

no abstracts in English

Preparation of metal nano-needles using ion-track membranes

Koshikawa, Hiroshi; Yamamoto, Shunya; Sugimoto, Masaki; Kitamura, Akane; Sawada, Shinichi; Yamaki, Tetsuya

no journal, , 

Chemical etching of polymer films irradiated with heavy ions leads to the formation of ion-track membranes with nanoscale pores in different shapes. Particularly, conically-shaped pores are expected to have a potential to create metallic nanoneedles by combination of vapor-deposition and electroplating methods. In this study, we prepared copper nanoneedles inside the conical pores of polyimide (PI)-based ion-track membranes and investigated their morphology. The PI films were irradiated with Ar ions. The irradiated films were etched in a sodium hypochlorite solution at 60C for 0.5 h, leading to the formation of conical pores with a surface diameter of ca. 500 nm. A very thin Au layer was deposited on this pore side of the ion-track membranes; then, it was used as a cathode for electroplating copper into the pores. After dissolving the PI templates, we obtained the copper needles ca. 500 nm in base diameter and 1.2 m in height on copper plates.