Influence of Gamma Ray Irradiation on the Optical Properties of Calcite and Dolomite

Abstract

The class of carbonaceous chondrite meteorites has carbon in their structures, similarly to the terrestrial calcite and dolomite rocks, and contains the group =CO3 linked to Ca and/or Mg, which may be, in principle, more susceptible to the action of the spatial gamma radiation (γ–R) due to the presence of these light-atom elements. On the present work, we used a variety of optical techniques to investigate the possible effects of γ–R produced by an artificial 192Ir source in terrestrial calcite and dolomite, which may allow to understand the effect of the spatial radiation in that celestial bodies of the solar system. As a result, we verified that the γ–R irradiation caused the effect of untrapping of electrons from deep color centers, that spatially migrate to other color centers on the samples, resulting on the change of the electron energetic configuration.

Study on the Influence of Electron Beam Radiation Sterilization Method on Chinese Mural Pigment

“…Three p with signals at 281, 711 and 1086 cm −1 represent the stretching vibration of the C-O w the calcium carbonate from both Baishi and Aladdin, while a signal at 1049 cm −1 of th lead white samples represents the stretching vibration of the carbonate ion [32,33] unchanged positions of Raman peaks equally indicate the stable structure of the samples after irradiation. Moreover, decreased peak intensities suggest that the ele redistribution on the strength of the photon-phonon coupling was influenced [34]. 8 gives the Raman spectra of irradiated and unirradiated samples.…”

“…The unchanged positions of Raman peaks equally indicate the stable structure of the four samples after irradiation. Moreover, decreased peak intensities suggest that the electron redistribution on the strength of the photon-phonon coupling was influenced [34]. The XPS spectra of the O1s of the two lead white samples before and after irrad are shown in Figure 9.…”

Gamma Irradiation-Assisted Synthesis of Silver Nanoparticle-Embedded Graphene Oxide-TiO2 Nanotube Nanocomposite for Organic Dye Photodegradation

“…The ability of radiolyzing mol-ecules and releasing charged moieties also result in the application of gamma ray irradiation in the synthesis of many other hybrid nanomaterials [3,6], to overcome shortcomings, elevate the advantages of each component, and expand their applications. Gamma ray irradiation-assisted synthesis of different types of materials (zeolite [7], thin films [8,9], minerals [10], hydrogels [11], membranes [12], as well as many others [13,14]) have been studied, which reinforced the high potential of this technique to be widely applied in advanced materials synthesis.…”

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In this work, silver nanoparticle-(AgNP-) embedded graphene oxide-(GO-) TiO 2 nanotube (TNT) nanocomposite (labelled GAT) was successfully synthesized by gamma ray radiolysis. The influence of irradiation process, including one-step and two-step assistances and at different irradiation doses (5,10,15,20, and 25 kGy), on the GAT's physicochemical properties was achieved. Structure and properties of irradiated materials were analyzed by Fourier-transformed infrared (FT-IR), ultraviolet-visible absorption (UV-Vis), and Raman spectroscopies; X-ray diffraction (XRD); and scanning electron (SEM) and transmission electron (TEM) microscopies.

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