scholarly journals Gamma-ray irradiation tests of CMOS sensors used in imaging techniques

2014 ◽  
Vol 29 (suppl.) ◽  
pp. 14-19 ◽  
Author(s):  
Salvatore Cappello ◽  
Calogero Pace ◽  
Aldo Parlato ◽  
Salvatore Rizzo ◽  
Elio Tomarchio
Keyword(s):  
Dose Rate ◽  
Gamma Ray ◽  
Imaging Techniques ◽  
Diagnostic Techniques ◽  
Image Sensors ◽  
Space Applications ◽  
Radiation Fluxes ◽  
Cmos Image Sensors ◽  
Long Time ◽  
Gamma Ray Irradiation

Technologically-enhanced electronic image sensors are used in various fields as diagnostic techniques in medicine or space applications. In the latter case the devices can be exposed to intense radiation fluxes over time which may impair the functioning of the same equipment. In this paper we report the results of gamma-ray irradiation tests on CMOS image sensors simulating the space radiation over a long time period. Gamma-ray irradiation tests were carried out by means of IGS-3 gamma irradiation facility of Palermo University, based on 60Co sources with different activities. To reduce the dose rate and realize a narrow gamma-ray beam, a lead-collimation system was purposely built. It permits to have dose rate values less than 10 mGy/s and to irradiate CMOS Image Sensors during operation. The total ionizing dose to CMOS image sensors was monitored in-situ, during irradiation, up to 1000 Gy and images were acquired every 25 Gy. At the end of the tests, the sensors continued to operate despite a background noise and some pixels were completely saturated. These effects, however, involve isolated pixels and therefore, should not affect the image quality.

Effect of proton radiation on 8T CMOS image sensors for space applications

2021 ◽  
pp. 1-9
Author(s):  
Jing Fu ◽  
Jie Feng ◽  
Yu-Dong Li ◽  
Qi Guo ◽  
Ying Wei ◽  
...  
Keyword(s):  
Image Sensors ◽  
Proton Radiation ◽  
Space Applications ◽  
Cmos Image Sensors

scholarly journals Simulation Technique on Dose-rate Distribution in a 60Co Gamma-ray Irradiation Field

RADIOISOTOPES ◽  
2010 ◽  
Vol 59 (1) ◽  
pp. 11-19
Author(s):  
Hirohisa KANEKO ◽  
Yasuyuki HARUYAMA ◽  
Hajime SEITO ◽  
Ryohei YAMAGATA ◽  
Hiroaki HANAYA ◽  
...  
Keyword(s):  
Dose Rate ◽  
Gamma Ray ◽  
Simulation Technique ◽  
Rate Distribution ◽  
Irradiation Field ◽  
60Co Gamma ◽  
Gamma Ray Irradiation

scholarly journals Effects of dose and dose rate of gamma ray irradiation on mutation induction and nuclear DNA content in chrysanthemum

2008 ◽  
Vol 58 (3) ◽  
pp. 331-335 ◽  
Author(s):  
Hiroyasu Yamaguchi ◽  
Akemi Shimizu ◽  
Konosuke Degi ◽  
Toshikazu Morishita
Keyword(s):  
Dose Rate ◽  
Dna Content ◽  
Gamma Ray ◽  
Nuclear Dna ◽  
Nuclear Dna Content ◽  
Mutation Induction ◽  
Gamma Ray Irradiation

scholarly journals Effect of Gamma-Ray Irradiation on the Thermal Contact Conductance of Carbon Nanotube Thermal Interface Materials

2013 ◽  
Author(s):  
Stephen L. Hodson ◽  
Robert A. Sayer ◽  
Timothy P. Koehler ◽  
Justin R. Serrano ◽  
Scott M. Dalton ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Thermal Performance ◽  
Gamma Ray ◽  
Thermal Contact Conductance ◽  
Thermal Interface Materials ◽  
Intrinsic Resistance ◽  
Space Applications ◽  
Thermal Interface ◽  
Gamma Ray Irradiation ◽  
Interface Materials

Thermal interface materials (TIMs) serve a critical role in the thermal management of electronic systems by enhancing the flow of heat from source to sink. Nanostructured materials, such as arrays of carbon nanotubes (CNTs) have been shown to outperform many commercially available TIMs due to their low intrinsic resistance and large compliance that enables them to conform to rough surfaces. These characteristics, combined with their low density and ability to withstand vacuum environments and extreme temperatures, make CNT-based TIMs very suitable for space applications. In space, materials are exposed to high doses of gamma radiation due to the lack of an atmosphere to serve as an absorbing medium. With typical design lifetimes of 5 to 10 years or even more, total radiation exposure can be significant and can affect the structure and performance of the TIM. In this work, the potentially adverse effects on the thermal performance of CNT TIMs of gamma-ray irradiation is reported. CNT TIMs were irradiated in a gamma cell at a rate of 250 rad/s to total doses of 50 and 100 Mrad. The thermal interface resistance was measured before and after gamma-ray irradiation using a transient photoacoustic (PA) method at room temperature and a contact pressure of 134 kPa and indicated no adverse effects of gamma-ray exposure on thermal performance.

scholarly journals Diversity Induction of Dendrobium sylvanum Orchid through In Vitro Irradiation of Gamma Ray

2018 ◽  
Vol 10 (3) ◽  
pp. 691-697
Author(s):  
Eka Puji Lestari ◽  
Ahmad Yunus ◽  
Sugiyarto Sugiyarto
Keyword(s):  
Tissue Culture ◽  
Gamma Ray ◽  
Leaf Length ◽  
The Other ◽  
New Variety ◽  
New Finding ◽  
Long Time ◽  
Gamma Ray Irradiation ◽  
The Impact

Dendrobium sylvanum orchid is categorized as lowland habitus orchid and able to survive wihtout any shade. Orchid cultivation takes a very long time so it needs faster cultivation and producing large quantities. Therefore, it is necessary to do orchid culture by using tissue culture processes and then given gamma ray irradiation to bring up new characters in the orchid .The purpose of this research was to discover the impact of gamma ray irradiation in vitro to the diversity of D. sylvanum. The doses of gamma ray used in this research were 0 Gy, 15 Gy, 30 Gy, 45 Gy, and 60 Gy. The results obtained indicated that mutation mostly occurred on the treatment with 15 Gy (4.4 cm of plant height, 2.67 of leaves, 2.36 cm of leaf length, 0.49 cm of leaf width, and 5.33 of root strands) compared to the other doses and the control plants. The new finding in this research is the gamma ray dose that can optimally stimulate the mutation in D. sylvanum. This information is useful to generate the new variety in orchid cultivation in Indonesia. This research provides innovation in orchid cultivation and new variety that is possible to arise after the mutation.

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.

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