The transition metal oxide embodied organic composites have great promise for high energy radiation detection. The interaction of high energy radiation such as γ-rays with the organic composite can generate photoelectric responses, Compton scattering and electron hole pairs, which can provide favorable properties to enhance the radiation detectivity of the composite. These effects along with changes of oxidation state of metal oxides, provide significant change in the electrical characteristics of composites due to radiation exposure. We have developed nickel oxide (NiO2) nanoparticles embodied urea composite (urea-NiO2), and determined effect of γ-radiation on the current – voltage characteristics in the frequency range of 100 Hz to 100,000Hz. In this paper, we describe the results of effect of additional oxidizing agent MnO2 (urea-NiO2-MnO2) on the morphology, processing and current voltage characteristics due to exposure of Cs-137 γ-radiation. It was observed that addition of MnO2 in urea-NiO2 composite decreases the sensitivity of detection. However, urea-NiO2-MnO2 composite recovers to original properties after irradiation much faster than urea-NiO2 composite.
N. B. Singh, Ching Hua Su, Bradley Arnold, Fow-Sen Choa, Christopher Cooper, Stacey Sova, Puneet Gill, Vishall Dayal, Lisa Kelly, Narasimha Prasad, Paul Smith, and Brian Cullum, "Effect of additives: Organic-metal oxide nanocomposites for γ-ray sensors," Proc. SPIE 10629, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX, 106290D (Presented at SPIE Defense + Security: April 16, 2018; Published: 23 May 2018); https://doi.org/10.1117/12.2301084.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon