Effect of additives: organic-metal oxide nanocomposites for γ-ray sensors

N. B. Singh, N. B. Singh, Ching Hua Su, Ching Hua Su, Bradley Arnold, Bradley Arnold, Fow-Sen Choa, Fow-Sen Choa, Christopher Cooper, Christopher Cooper, Stacey Sova, Stacey Sova, Puneet Gill, Puneet Gill, Vishall Dayal, Vishall Dayal, Lisa Kelly, Lisa Kelly, Narasimha Prasad, Narasimha Prasad, Paul Smith, Paul Smith, Brian Cullum, 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 (23 May 2018); doi: 10.1117/12.2301084;

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Subjects

γ-ray
nanocomposite
urea
oxides
detectors
sensors
radiation
exposure

Abstract

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.