Formation of different types of paramagnetic centers in the alanine dosimeters exposed to alpha and gamma radiation - Study by EPR spectroscopy

ABSTRACTElectron paramagnetic resonance (EPR) spectroscopy is a well-established method of dating based on trapped charges, applied to various crystalline materials, including carbonates, bones, and teeth. It provides a detailed insight into the structure of radiation defects—paramagnetic centers generated by irradiation, without the need of a painstaking sample preparation, often challenging in other methods. Using EPR we studied the effect of γ radiation on lime mortars and plasters from ancient settlement Hippos in Israel, in order to analyze the process of defect generation. Analysis of the complex spectra revealed the presence of radiation-induced species, including CO2–, NO32– and organic radical. Using an artificial UV source, we generated relatively strong signals of paramagnetic centers, analogous to those created by γ irradiation, reaching their maximum intensity after 5–6 hr of UV exposure. Our results confirm the previous reports that radiation defects can also be generated, instead of bleached, in calcite by UV radiation, which is crucial for identifying the issues related to light exposition, affecting the accuracy of age determinations in trapped-charge dating methods.

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Nitrogen concentration and anisotropic effects on the EPR spectra of natural diamonds

CrystEngComm ◽

10.1039/d0ce01653e ◽

2021 ◽

Author(s):

Ira Litvak ◽

Haim Cohen ◽

Yaakov Anker ◽

Sharon Ruthstein

Keyword(s):

Epr Spectroscopy ◽

Nitrogen Concentration ◽

Epr Spectra ◽

Paramagnetic Centers ◽

Natural Diamonds

EPR spectroscopy of pre-color treated natural diamonds – yellow and green: correlation between natural pre colored diamond paramagnetic centers and nitrogen concentration.

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The effect of proton and gamma radiation on different types of temperature sensors

2009 European Conference on Radiation and Its Effects on Components and Systems ◽

10.1109/radecs.2009.5994550 ◽

2009 ◽

Cited By ~ 2

Author(s):

Miguel Gonzalez-Guerrero ◽

Maria T. Alvarez ◽

Juan J. Jimenez ◽

Jaime Sanchez-Paramo ◽

Hector Guerrero

Keyword(s):

Gamma Radiation ◽

Temperature Sensors ◽

Different Types

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Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with 13C

Nukleonika ◽

10.1515/nuka-2015-0076 ◽

2015 ◽

Vol 60 (3) ◽

pp. 429-434 ◽

Cited By ~ 7

Author(s):

Jarosław Sadło ◽

Anna Bugaj ◽

Grażyna Strzelczak ◽

Marcin Sterniczuk ◽

Zbigniew Jaegermann

Keyword(s):

Calcium Carbonate ◽

Epr Spectroscopy ◽

Orthorhombic Symmetry ◽

Paramagnetic Centers ◽

Calcium Carbonates ◽

Radiation Induced

AbstractIn calcite and aragonite, γ-irradiated at 77 K, several paramagnetic centers were generated and detected by EPR spectroscopy; in calcite, CO3−(orthorhombic symmetry, bulk and bonded to surface), CO33−, NO32−, O3−, and in aragonite CO2−(isotropic and orthorhombic symmetry) depending on the type of calcium carbonate used. For calcium carbonates enriched with13C more detailed information about the formed radicals was possible to be obtained. In both natural (white coral) and synthetic aragonite the same radicals were identified with main differences in the properties of CO2−radicals. An application of Q-band EPR allowed to avoid the signals overlap giving the characteristics of radical anisotropy.

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Determination of the Energy Levels of Paramagnetic Centers in the Band Gap of Nanostructured Oxide Semiconductors Using EPR Spectroscopy

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.8b01621 ◽

2018 ◽

Vol 122 (18) ◽

pp. 10248-10254 ◽

Cited By ~ 12

Author(s):

Elizaveta A. Konstantinova ◽

Anton A. Minnekhanov ◽

Alexander I. Kokorin ◽

Tatyana V. Sviridova ◽

Dmitry V. Sviridov

Keyword(s):

Band Gap ◽

Epr Spectroscopy ◽

Energy Levels ◽

Paramagnetic Centers ◽

Oxide Semiconductors ◽

Nanostructured Oxide

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Frequency and Spectrum of Induced Viable Macromutations in Chickpea (Cicer arietinum L.) Cultivar ‘Vishwas’

International Letters of Natural Sciences ◽

10.18052/www.scipress.com/ilns.30.1 ◽

2014 ◽

Vol 30 ◽

pp. 1-10

Author(s):

J.D. Barshile

Keyword(s):

Gamma Radiation ◽

Cicer Arietinum ◽

Wide Spectrum ◽

Plant Type ◽

Different Types ◽

Chickpea Cultivar ◽

Generation Differences ◽

Gamma Radiations ◽

And Control

Present investigation was undertaken to study the frequency and spectrum of induced viable macromutations employing SA, EMS and gamma radiation in chickpea (Cicer arietinum L.) cultivar Vishwas (Phule G 5). The seeds of chickpea, cultivar Vishwas were treated with three different concentrations / doses of SA (2, 3 and 4 mM), EMS (8, 12 and 16 mM) and gamma radiations (400, 500 and 600 Gy). The mutagen administered seeds were sown in experimental fields to raise M1 progeny. Seeds of M1 plants and control were harvested separately and sown to raise M2 population. The M2 progeny were screened for viable macromutaions. A wide spectrum of viable macromutations was isolated in the M2 generation. In all twenty four different types of viable morphological macromutations were observed. These included 7 types of plant type mutations and 6 types of leaf mutations, 1 types of flower mutation, 5 types of pod mutation and 5 types of seed mutations. Results indicated that all mutagenic treatments were effective in inducing viable mutations in chickpea, during M2 generation. Differences in response to different mutagens were observed in the spectrum and frequency of viable mutations. Some mutation types occurred more frequently than others. The frequency and spectrum of viable mutations were relatively high with EMS followed by gamma radiation and SA. In the present investigation, an attempt has been made for increasing frequency and spectrum of locally important chickpea cultivar ‘Vishwas’ employing chemical and physical mutagens.

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Protective Capacity of Fusarium oxysporum Extract Against Gamma Radiation. Study for Some Biochemical Parameters in Albino Male Rats

Arab Journal of Nuclear Sciences and Applications ◽

10.21608/ajnsa.2021.61068.1443 ◽

2021 ◽

Vol 0 (0) ◽

pp. 1-11

Author(s):

Samir Eskander ◽

Alia Ezz El arab

Keyword(s):

Gamma Radiation ◽

Fusarium Oxysporum ◽

Biochemical Parameters ◽

Male Rats ◽

Protective Capacity ◽

Radiation Study

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Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials

Nukleonika ◽

10.1515/nuka-2015-0080 ◽

2015 ◽

Vol 60 (3) ◽

pp. 449-453

Author(s):

Jakub Adamczyk ◽

Paweł Ramos ◽

Barbara Pilawa

Keyword(s):

Epr Spectroscopy ◽

Microwave Power ◽

Lattice Relaxation ◽

Biocompatible Materials ◽

Spin Lattice Relaxation ◽

Epr Spectra ◽

Natural Material ◽

Relaxation Processes ◽

Paramagnetic Centers ◽

Natural And Synthetic

Abstract Paramagnetic centers in the two exemplary synthetic and natural dental biocompatible materials applied in implantology were examined by the use of an X-band (9.3 GHz) electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra were measured in the range of microwave power 2.2–70 mW. The aims of this work were to compare paramagnetic centers concentrations in different dental biocompatible materials and to determine the effect of microwave power on parameters of their EPR spectra. It is the very first and innovatory examination of paramagnetic centers in these materials. It was pointed out that paramagnetic centers existed in both natural (~1018 spin/g) and synthetic (~1019 spin/g) dental biocompatible materials, but the lower free radical concentration characterized the natural sample. Continuous microwave saturation of EPR spectra indicated that faster spin-lattice relaxation processes existed in synthetic dental biocompatible materials than in natural material. Linewidths (ΔBpp) of the EPR spectra of the natural dental material slightly increased for the higher microwave powers. Such effect was not observed for the synthetic material. The broad EPR lines (ΔBpp): 2.4 mT, 3.9 mT, were measured for the natural and synthetic dental materials, respectively. Probably strong dipolar interactions between paramagnetic centers in the studied samples may be responsible for their line broadening. EPR spectroscopy is the useful experimental method in the examination of paramagnetic centers in dental biocompatible materials.

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