Correlation between radiation-induced defects, and optical properties of pure fused silica-core optical fiber, under gamma-ray irradiation in air at 1273K

In this paper, we report the characterization of springback degradation of an Invar sheet with a combination of gamma-ray irradiation and repeated hot-then-cold stresses. The springback factor value of fresh Invar without radiation shows a linear increase with the number of hot-then-cold stress cycles. Continuous springback degradations are observed as the number of hot-then-cold stress cycles reaches 100. When the Invar sheet is subjected to gamma-ray irradiation, the springback factor is greater than that of the repeated hot-then-cold stressed samples. After applying the repeated hot-then-cold stresses to the post-irradiated Invar sheets, the springback factors are first restored to the value of fresh Invar, and then revert to an increasing trend. Our previous X-ray diffraction (XRD) analysis excluded the crystalline structural changes in the post-irradiated Invar. It is believed that the radiation-induced defects, which are closely related to the springback degradation, are possibly annealed during the first 20 hot-then-cold stress cycles. These cycles ultimately dominate the springback behavior of the stressed Invar sheets.

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Experimental research on radiation induced changes of polymer optical fiber under gamma-ray irradiation

10.1117/12.736339 ◽

2007 ◽

Author(s):

Wenping Ge ◽

Weijian Tian ◽

Zhenhong Jia ◽

Yaoxiang Wang

Keyword(s):

Optical Fiber ◽

Experimental Research ◽

Gamma Ray ◽

Polymer Optical Fiber ◽

Radiation Induced ◽

Gamma Ray Irradiation ◽

Induced Changes

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Gamma-Ray Radiation-Induced Surface Hydrophobic Effects in Invar Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.482-484.1585 ◽

2012 ◽

Vol 482-484 ◽

pp. 1585-1591 ◽

Cited By ~ 1

Author(s):

Cheng Fu Yang ◽

Wei Wen Wang ◽

Hsin Hwa Chen ◽

Wei Tan Sun ◽

Chi Lin Shiau ◽

...

Keyword(s):

Radiation Dose ◽

Structural Changes ◽

Gamma Ray ◽

Small Deviation ◽

Contact Angles ◽

Invar Alloy ◽

Hydrophobic Effects ◽

Post Irradiation ◽

Radiation Induced ◽

Gamma Ray Irradiation

In this paper, we report a new phenomenon observed in the gamma-ray radiation-induced hydrophobic effects on an Invar surface: When the Invar alloy is subjected to different doses of gamma-ray irradiation, the contact angle increases with the radiation dose. Invar samples with exposed to a higher dose appear more hydrophobic, but this tendency disappears following post-irradiation etching. The contact angles of the irradiated and etched Invar samples can be restored back to a stable value with small deviation after 30 min of annealing at 150°C. X-ray diffraction (XRD) analysis found no crystalline structural changes. High resolution field emission scanning microscope (FE-SEM) analyses showed that irradiation might induce crack-like surfaces which could be removed at higher radiation dose in the following acid etchings. It is believed that the chemical bonds of Invar oxide on the surface were broken by the gamma-ray irradiation, thus raising the likelihood of binding with free ions in the air and resulting in the exclusion of the hydrophilic OH bonds, leaving a hydrophobic post-irradiation Invar surface.

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Temperature dependence of radiation induced optical transmission loss in fused silica core optical fibers

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2004.04.243 ◽

2004 ◽

Vol 329-333 ◽

pp. 1503-1506 ◽

Cited By ~ 11

Author(s):

K Okamoto ◽

K Toh ◽

S Nagata ◽

B Tsuchiya ◽

T Suzuki ◽

...

Keyword(s):

Temperature Dependence ◽

Optical Fibers ◽

Optical Transmission ◽

Transmission Loss ◽

Fused Silica ◽

Radiation Induced ◽

Silica Core

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Radiation Induced Surface Activation on SUS304 Rod Surface Coated With Thin Film Layer Formed by Vacuum Evaporation Method

Volume 3: Thermal Hydraulics; Instrumentation and Controls ◽

10.1115/icone16-48192 ◽

2008 ◽

Author(s):

Jian Zhang ◽

Kaichiro Mishima ◽

Naoki Sugitani ◽

Masahiro Hino ◽

Tomoji Takamasa

Keyword(s):

Gamma Ray ◽

Vacuum Evaporation ◽

Outer Diameter ◽

Evaporation Method ◽

Thin Film Layer ◽

Radiation Induced ◽

Gamma Ray Irradiation ◽

Film Layer ◽

Coated Surface ◽

Coated Surfaces

In this study, the effect of film layer deposited on a metal surface by vacuum evaporation method on the RISA phenomenon was investigated from the view points of surface wettability and quenching velocity. Test rods were made of SUS304 with the outer diameter of 24mm and the length of 150mm. Four kinds of materials, i.e. titanium, zircaloy-II, germanium and silicon, were deposited separately on the half-circumference surface of a SUS304 rod with thickness of 200 nm. It was concluded that the RISA effect was observed on the film-coated surfaces after gamma-ray irradiation, which is similar to that on an oxide layer of SUS304 surface. It was also found that the quenching velocity on film-coated surfaces was much faster than that on an un-coated surface.

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