Comparison of stability of WSiX/SiC and Ni/SiC Schottky rectifiers to high dose gamma-ray irradiation

2004 ◽  
Vol 84 (3) ◽  
pp. 371-373 ◽  
Author(s):  
Jihyun Kim ◽  
F. Ren ◽  
G. Y. Chung ◽  
M. F. MacMillan ◽  
A. G. Baca ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Dose ◽  
Schottky Rectifiers ◽  
Gamma Ray Irradiation

High Dose Gamma-Ray Irradiation of SiC Schottky Rectifiers

2003 ◽  
Vol 6 (8) ◽  
pp. G105 ◽  
Author(s):  
Jihyun Kim ◽  
S. Nigam ◽  
F. Ren ◽  
D. Schoenfeld ◽  
G. Y. Chung ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Dose ◽  
Schottky Rectifiers ◽  
Gamma Ray Irradiation

Effect of γ-ray irradiation on performance of LiNbO(3)-based piezoelectric vibration sensors

2021 ◽  
Author(s):  
Huifen Wei ◽  
Wenping Geng ◽  
Kaixi Bi ◽  
Tao Li ◽  
Xiangmeng Li ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Extreme Environments ◽  
Theoretical Work ◽  
High Dose ◽  
Mems Devices ◽  
Micro Electro Mechanical Systems ◽  
Vibration Sensors ◽  
Irradiation Dosage ◽  
Gamma Ray Irradiation ◽  
Γ Ray

Abstract LiNbO3 (LN)-based micro-electro-mechanical systems (MEMS) vibration sensors exhibit giant prospection in extreme environments, where exist a great amount of irradiation. However, to the best of our knowledge, it is still unknown whether the irradiation affects the performance of LN-based piezoelectric MEMS sensors. Based on this consideration, it is necessary to model the irradiation environment to investigate the effect of high dosage irradiation on LN-based vibration sensors. Firstly, the theoretical work is done to study the Compton Effect on the Gamma-ray irradiation with Co-60 source. After irradiation, X-ray diffraction (XRD) characterization was performed to verify the effect of irradiation on the crystalline of LN thin film. Meanwhile, the performances of output voltages on the five MEMS devices under various dosage of irradiation are compared. As a result, a neglected shift of 0.02 degrees was observed from the XRD image only under maximum irradiation dosage of 100 Mrad(Si). Moreover, the output voltages of cantilever-beam vibration sensors decrease by 3.1%. Therefore, it is verified that the γ-ray irradiation has very little influence on the LN-based MEMS vibration sensors, which have great attraction on the materials and sensors under high-dose irradiation.

Effects of Irradiation on Chitosan-Coated Nanoparticles for Hyperthermia

2011 ◽  
Vol 311-313 ◽  
pp. 419-431
Author(s):  
Kwo Ping Chang ◽  
Zhi Yuan Lin ◽  
Mao Chin Hung ◽  
Bor Tsung Hsieh
Keyword(s):  
Specific Absorption Rate ◽  
Gamma Ray ◽  
Quality Characteristic ◽  
Molar Ratio ◽  
High Dose ◽  
Optimal Parameters ◽  
Control Factors ◽  
Coated Nanoparticles ◽  
Gamma Ray Irradiation ◽  
Positive Effect

The optimal parameters of the chitosan-coated ferrofluid under two patterns of irradiation were investigated in this study. The quality characteristics were set both to the SAR (specific absorption rate, W/g) and the particle size (nm). The control factors were chosen as the gamma irradiation dose (Gy), the quantities of chitosan (g), and the molar ratio of Fe3+to Fe2+. It shows that SAR is a better choice for determining the quality characteristic. The quantities of chitosan have a less significant impact on SAR. The optimal condition for the Fe3+/Fe2+ratio was found to be between 2.0 to 2.5 when synthesizing the magnetite Fe3O4cores. High dose (100 k Gy in this study) of gamma ray irradiation given only to the solid chitosan will have a significantly positive effect on SAR of the chitosan-coated ferrofluid for hyperthermia. However, high dose irradiation of the chitosan-coated ferrofluid tends to destroy the chitosan-magnetite cores bonds.

Gamma-ray irradiation and post-irradiation responses of high dose range RADFETs

2002 ◽  
Vol 49 (3) ◽  
pp. 1356-1363 ◽  
Author(s):  
A. Jaksic ◽  
G. Ristic ◽  
M. Pejovic ◽  
A. Mohammadzadeh ◽  
C. Sudre ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Dose Range ◽  
High Dose ◽  
Post Irradiation ◽  
Gamma Ray Irradiation

Grafting of polymers from clay nanoparticles via high-dose gamma-ray irradiation

2007 ◽  
Vol 61 (17) ◽  
pp. 3723-3727 ◽  
Author(s):  
Tao Wang ◽  
Mozhen Wang ◽  
Zhicheng Zhang ◽  
Xuewu Ge ◽  
Yue'e Fang
Keyword(s):  
Gamma Ray ◽  
High Dose ◽  
Clay Nanoparticles ◽  
Gamma Ray Irradiation

scholarly journals A Performance Evaluation of a Notebook PC under a High Dose-Rate Gamma Ray Irradiation Test

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Jai Wan Cho ◽  
Kyung Min Jeong
Keyword(s):  
Performance Evaluation ◽  
Dose Rate ◽  
Nuclear Power ◽  
Gamma Ray ◽  
Control Unit ◽  
High Dose Rate ◽  
High Dose ◽  
Robot System ◽  
Irradiation Test ◽  
Gamma Ray Irradiation

We describe the performance of a notebook PC under a high dose-rate gamma ray irradiation test. A notebook PC, which is small and light weight, is generally used as the control unit of a robot system and loaded onto the robot body. Using TEPCO’s CAMS (containment atmospheric monitoring system) data, the gamma ray dose rate before and after a hydrogen explosion in reactor units 1–3 of the Fukushima nuclear power plant was more than 150 Gy/h. To use a notebook PC as the control unit of a robot system entering a reactor building to mitigate the severe accident situation of a nuclear power plant, the performance of the notebook PC under such intense gamma-irradiation fields should be evaluated. Under a similar dose-rate (150 Gy/h) gamma ray environment, the performances of different notebook PCs were evaluated. In addition, a simple method for a performance evaluation of a notebook PC under a high dose-rate gamma ray irradiation test is proposed. Three notebook PCs were tested to verify the method proposed in this paper.

scholarly journals Impact of high-dose gamma-ray irradiation on electrical characteristics of N-polar and Ga-polar GaN p–n diodes

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025009
Author(s):  
F. Mirkhosravi ◽  
A. Rashidi ◽  
J. Gallagher ◽  
M. Monavarian ◽  
A. Aragon ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Dose ◽  
Electrical Characteristics ◽  
Gamma Ray Irradiation

Effect of radiation on mechanical properties and molecular structure of rubbers for nuclear robots

2021 ◽  
Vol 11 (9) ◽  
pp. 1561-1570
Author(s):  
Yuanyuan Li ◽  
Shuzhi Sam Ge ◽  
Kun Mo ◽  
Biao Liu
Keyword(s):  
Molecular Structure ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Decomposition Reaction ◽  
Nitrile Rubber ◽  
High Dose ◽  
High Radiation ◽  
Oxidative Decomposition ◽  
Automation Equipment ◽  
Gamma Ray Irradiation

As polymers, rubber materials are easily affected by radiation; therefore, their radiation resistance must be considered for their use in robots and automation equipment in high-radiation environments. In this study, the properties of several common rubber materials, ethylene propylene diene monomer (EPDM), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluororubber (FKM), and acrylate rubber (ACM), were investigated under high-dose gamma-ray irradiation. The dose rate of gamma rays was 66.76 Gy/min, and the cumulative dose was 1214965.24 Gy. Oxidative decomposition of the double bond of EPDM occurred, leading to slight decreases in the strength and elongation. NBR and HNBR were mainly subjected to crosslinking of the molecular structure, resulting in small increases in strength and significant decreases in elongation. The cyano decomposition reaction occurred in ACM, and its crystallinity increased, leading to embrittlement and decreases in the strength and elongation. Oxidative decomposition and cross-linking simultaneously occurred in FKM, resulting in an increase in strength and decreases in elongation and the elastic modulus.

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