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.

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.

scholarly journals Gamma Ray-Induced Polymerization and Cross-Linking for Optimization of PPy/PVP Hydrogel as Biomaterial

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 111 ◽  
Author(s):  
Jin-Oh Jeong ◽  
Jong-Seok Park ◽  
Young-Ah Kim ◽  
Su-Jin Yang ◽  
Sung-In Jeong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Viability ◽  
Gamma Rays ◽  
Biomedical Applications ◽  
Gamma Ray ◽  
The Other ◽  
Cross Linking ◽  
Gamma Ray Irradiation ◽  
Good Cell ◽  
Scanning Electron

Conducting polymer (CP)-based hydrogels exhibit the behaviors of bending or contraction/relaxation due to electrical stimulation. They are similar in some ways to biological organs and have advantages regarding manipulation and miniaturization. Thus, these hydrogels have attracted considerable interest for biomedical applications. In this study, we prepared PPy/PVP hydrogel with different concentrations and content through polymerization and cross-linking induced by gamma-ray irradiation at 25 kGy to optimize the mechanical properties of the resulting PPy/PVP hydrogel. Optimization of the PPy/PVP hydrogel was confirmed by characterization using scanning electron microscopy, gel fraction, swelling ratio, and Fourier transform infrared spectroscopy. In addition, we assessed live-cell viability using live/dead assay and CCK-8 assay, and found good cell viability regardless of the concentration and content of Py/pTS. The conductivity of PPy/PVP hydrogel was at least 13 mS/cm. The mechanical properties of PPy/PVP hydrogel are important factors in their application for biomaterials. It was found that 0.15PPy/PVP20 (51.96 ± 6.12 kPa) exhibited better compressive strength than the other samples for use in CP-based hydrogels. Therefore, it was concluded that gamma rays can be used to optimize PPy/PVP hydrogel and that biomedical applications of CP-based hydrogels will be possible.

scholarly journals Study on Induced Current of Iron Plate Irradiated by Pulsed Gamma Rays

2018 ◽  
Vol 53 ◽  
pp. 01007
Author(s):  
Yinghong Zuo ◽  
Maoyu Zhang ◽  
Guoxin Cheng ◽  
Shengli Niu
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Transient Current ◽  
Current Response ◽  
Induced Current ◽  
Metal Component ◽  
Iron Plate ◽  
Gamma Ray Irradiation ◽  
Charge Deposition ◽  
The Relationship

To obtain the transient current response law of the metal component irradiated by pulsed gamma rays, the pulsed gamma ray irradiation experiment of the iron plate was carried out on “Qiangguang-I” accelerator. The transient current of iron plate generated by pulsed gamma rays was measured and analysed, and the relationship between the amplitude of pulse current and the dose rate of gamma rays was obtained. The results show that the current response sensitivity of the iron plate is about 5.7×10-7(A/m2)/(Gy/s) when the gamma rays with the energy of 0.8 MeV irradiate the iron plate. The charge deposition rate in the iron plate can be obtained by Monte Carlo simulation, and then it can be converted to gamma ray induced current of the metal component irradiated by gamma rays.

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.

Effects of Fabrication Process on the Electrical Characteristics of n-Channel MOSFETs Irradiated with Gamma-Rays

2008 ◽  
Vol 600-603 ◽  
pp. 707-710
Author(s):  
Shigeomi Hishiki ◽  
Naoya Iwamoto ◽  
Takeshi Ohshima ◽  
Hisayoshi Itoh ◽  
Kazu Kojima ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Radiation Resistance ◽  
Carbon Coating ◽  
Gamma Ray ◽  
Sample Surface ◽  
Fabrication Process ◽  
Channel Mobility ◽  
Carbon Coated ◽  
Gamma Ray Irradiation ◽  
Post Implantation

The effect of the fabrication process of n-channel 6H-SiC MOSFETs on their radiation resistance is investigated. MOSFETs that post implantation annealing for source and drain was carried out with carbon coating on the sample surface are compared to MOSFETs that post implantation annealing was carried out without carbon coating. The radiation resistance (gamma-rays) of the carbon-coated MOSFETs is higher than that of non-coated ones. The channel mobility for MOSFETs whose gate oxide was formed using pyrogenic or dry oxidation process dose not change by gamma-ray irradiation below 1x105 Gy. The value of channel mobility slightly increases with increasing dose above 1x105 Gy. No significant increase in irradiation induced interface traps is observed.

Oxygen Ion Induced Charge in SiC MOS Capacitors Irradiated with Gamma-Rays

2011 ◽  
Vol 679-680 ◽  
pp. 362-365 ◽  
Author(s):  
Takeshi Ohshima ◽  
Naoya Iwamoto ◽  
Shinobu Onoda ◽  
Takahiro Makino ◽  
Shinji Nozaki ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Ion Beam ◽  
Gate Oxide ◽  
Peak Amplitude ◽  
Induced Current ◽  
Mos Capacitors ◽  
Oxygen Ion ◽  
Before And After ◽  
Gamma Ray Irradiation

Charge induced in 6H-SiC nMOS capacitors by 15 MeV oxygen ion microbeams was measured using Transient Ion Beam Induced Current (TIBIC) before and after gamma-ray irradiations. The peak amplitude of TIBIC signals decreases and the fall time increases with increasing number of incident ions. The decrease in the TIBIC peak eventually saturated. The TIBIC signal can be refreshed to its original shape by applying a positive bias of + 1V to gate oxide. Small decrease in both the peak amplitude of TIBIC signal and collected charge was observed due to gamma-ray irradiation.

scholarly journals THE ADAPTATION LEVEL OF ALFALFA (MEDICAGO SATIVA L.) THAT IRRADIATED WITH GAMMA RAYS ON A FIELD SCALE

Pastura ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Prihantoro, I. ◽  
Anandia, A. ◽  
Aryanto, A. T. ◽  
Setiana, M. A. ◽  
Karti, P. D. M. H.
Keyword(s):  
Medicago Sativa ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Adaptation Level ◽  
Field Scale ◽  
Leaf Color ◽  
Randomized Design ◽  
Gamma Ray Irradiation ◽  
Medicago Sativa L ◽  
Dark Green

Alfalfa (Medicago sativa L.) a high nutritious and palatability legume for ruminant. Constrain of alfalfa availability in Indonesia are due to the plant adaptability in tropical environment. Aim of the study was to measure the adaptation level of alfalfa that irradiated with gamma rays on a field scale. The study consisted of four types of plant sources, mutation plants with different gamma ray levels (0Gy, 200Gy, 300Gy and 400Gy). Plant tillers was analyzed with a complete randomized design with 3 replications, 20 plants per replication. Growth capability, leaf color, flowering time and pest attack level were analyzed descriptively. The results showed that alfalfa irradiated with 300 Gy significantly (p<0.05) produced highest tillers. Irradiated 300 Gy plant gave better result on growth capability, flowering capability, and number of not attack plant from pests. The higher level of gamma ray irradiation showed the changed in leaf color levels from dark green to light green. Keywords: alfalfa (Medicago sativa L.), mutation, gamma ray irradiation, field scale

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
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