Effect of Additives: Gamma-Ray Sensors Based on Ionizing Organic Nanocomposites

Dayal, Vishall ; Cooper, Christopher ; Sova, Stacey ; Gill, Puneet ; Su, Ching-Hua ; Arnold, Bradley ; Choa, Fow-Sen ; Kelly, Lisa ; Cullum, Brian ; Smith, Paul(Maryland Univ Baltimore County, Baltimore, MD, United States)

关键词: GAMMA RAYS;    RADIATION DETECTORS;    NANOCOMPOSITES;    ADDITIVES;    NICKEL OXIDES;    MANGANESE OXIDES;    IRRADIATION;    UREAS;   

RP-ID  :  M18-6599

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

We have developed ionizing organic-based composites which have demonstrated great promise for radiation sensing. Nickel oxide has been proven as an active material for detecting high energy radiation. The oxidation state of unusual oxides such as nickel oxide in nanocomposites of ionizing organics changes much faster than thin film or bulk, and hence increases the sensitivity for radiation sensing. The resistivity of the oxide composite increases following sequential irradiation processes because of the decrease in holes' concentration. In this paper, we will present the effect of additional oxidizing agent on the morphology, processing and sensing of gamma-rays by oxides - urea based nanocomposites. It was observed that addition of MnO2 decreases the sensitivity. However, it recovers to original properties after irradiation much faster than undoped composites.