Structural studies and optical properties of pearl nucleus irradiated by gamma-ray

Title
Structural studies and optical properties of pearl nucleus irradiated by gamma-ray
Author(s)
주상우Hea-Yeon Kim[Hea-Yeon Kim]요네스피로즈살라리바너지나라얀민봉기Woo-Geon Jung[Woo-Geon Jung]
Keywords
HIGH-PRESSURE; CACO3; ESR; ARAGONITE; FLUORESCENCE; CARBONATES; RADIATION; MINERALS; RADICALS; COLOR
Issue Date
201311
Publisher
TAYLOR & FRANCIS LTD
Citation
RADIATION EFFECTS AND DEFECTS IN SOLIDS, v.168, no.9, pp.696 - 704
Abstract
The effect of gamma-ray irradiation on the color and structure of the nucleus and cultured pearl nucleus is studied experimentally. By using a (Co-60) gamma-ray irradiator, the nucleus originating from freshwater shell is irradiated. Consequently, the color of the nucleus is altered from white to blackish brown or gray by an increase in the irradiation dose treatments. The structural identification of all samples has been confirmed using X-ray diffraction. It is clearly found that all the samples are composed of aragonite, a common phase of the mineral CaCO3. A slight change in the crystallinity of the sample is observed when irradiated with high dose of radiation. Scanning electron microscopy images show that there are no morphological changes by irradiation. UV-Vis spectroscopic measurement is used to distinguish and analyze the change of color due to different irradiation doses. With an increase in the gamma-ray radiation doses, a red shift in the absorption edge of the optical spectra of pearl nucleus is observed. Electron spin resonance signal shows mainly the presence of radiation-induced radicals CO2- as color center defects within the samples. An increase in the defects with a gradual increase in the radiation dose depicts that the defect-level transition is the dominant mechanism for the color change in the pearl nucleus.
URI
http://hdl.handle.net/YU.REPOSITORY/28557http://dx.doi.org/10.1080/10420150.2012.761997
ISSN
1042-0150
Appears in Collections:
공과대학 > 기계공학부 > Articles
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