Temperature experiments on mollusc samples: an approach to ESR signal identification

Katzenberger, O.; Debuyst, René; Decanniere, P.; Dejehet, Fernand; Apers, Désiré; Barabas, Michael

doi:10.1016/0883-2889(89)90048-8

Cited by 48 publications

(13 citation statements)

References 5 publications

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“…4, respectively. Calculated rhombic g values correlate well with both experimental g values determined in the present work for strong resonance peaks: 8 (g 8 = 2.0082); 9 (g 9 = 2.0057); 10 (g 10 = 2.0022) and with those reported in the literature for SO 2 − ionic radical induced in sulphur containing compounds irradiated by gamma radiation [7][8][9][10][11][12][13][14]. In fact, SO 2 is the most sensitive sub group to radiation in SS molecule due to its high electrophilic feature, and is expected to be at the origin of the observed three strong resonance lines dominating ESR spectra through the formation of SO 2 − ionic radical species that is called radical B in the present work.…”

Section: Simulation Calculations and Proposed Tentative Radical Speciessupporting

confidence: 78%

“…The results of the microwave saturation studies indicate that, although, peaks 7 and 11 belong to weak peaks, their intensities increase much faster than the other weak peaks but much slower than the intensities of strong peaks. This shows that weak peaks appearing just at the left and right sides of the strong central peaks (8)(9)(10) are affected heavily from the presence of the strong peaks. …”

Section: Variation Of the Signal Intensities With Microwave Powermentioning

confidence: 93%

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ESR investigation of gamma irradiated sulbactam sodium

Yürüş

Özbey

Korkmaz

2004

Journal of Pharmaceutical and Biomedical Analysis

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Section: Simulation Calculations and Proposed Tentative Radical Speciessupporting

confidence: 78%

Section: Variation Of the Signal Intensities With Microwave Powermentioning

confidence: 93%

ESR investigation of gamma irradiated sulbactam sodium

Yürüş

Özbey

Korkmaz

2004

Journal of Pharmaceutical and Biomedical Analysis

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“…It contains a rather intense narrow isotropic signal (denoted by A) with g(iso) = 2.0055 and a line width ∆H = 0.13 mT. A similar signal (with g(iso) = 2.0053 [6]; 2.0054 [7]; 2.0057 [2,8], and 2.0060 [9,10]) was revealed in the EPR spectra of irradiated natural and synthetic carbonates. In [2,7,10], the reason for the appearance of the paramagnetic particles responsible for this signal was related to the presence of impurity sulfate-ions in specimens and assigned them to radiatively induced ion-radicals SO 2 − (iso).…”

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confidence: 87%

Stabilization of Ion-Radicals in the Structure of Calcium Sulfite

Bogushevich

Ugolev

2005

J Appl Spectrosc

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Using the EPR-and IR-spectroscopy methods, we studied the conditions of formation of stable ion-radicals in the structure of calcium sulfite and determined the limits of their stability. We detected and identified the ionradicals SO 2 − with g(iso) = 2.0055 in the initial substances, two types of thermally induced SO 2 − (with g 1 = 2.0093, g 2 = 2.0045, and g 3 = 2.0020, and g 1 = 2.0104, g 2 = 2.0049, and g 3 = 2.0018) when the substance was heated, and three types of mechanically induced SO 3 − (with g M = 2.0036 and g N = 2.0022, with g(iso) = 2.0033 and ∆H = 0.1 mT and with g(iso) = 2.0031 and ∆H = 0.33 mT) when the substance was ground up.Keywords: EPR and IR spectroscopy, EPR dosimetry, sulfite and sulfate anions, SO 2 − and SO 3 − ion-radicals.Introduction. One possible method of reconstruction of absorbed doses of ionizing radiations applied in spinresonance dosimetry and in the region of EPR dating of geological and archeological materials is the cumulative-dose method [1]. It is based on determination of the concentration of accumulated radiatively induced paramagnetic particles and involves an initial mechanical or thermal processing of the object under study and subsequent additional irradiation of this object. In the course of preliminary preparation, mechanically and thermally induced paramagnetic particles can form in the substance that have g factors close to the values of the g factors (or coinciding with them) for radiatively induced paramagnetic particles. As a result, additional, often neglected, errors are brought into the unknown value of the reconstructed dose and make its determination difficult. In view of this, there is a pressing need to investigate the nature of nonradiative paramagnetic particles, the mechanisms of their formation, and the conditions of stabilization in a substance.Along with other materials, carbonates of natural origin are used to reconstruct absorbed doses. The characteristic feature of these carbonates is the presence of sulfite-anions [2, 3]. Moreover, it is known that such a compound as barium sulfite in the absence of irradiation is capable of stabilizing ion-radicals in its structure [4,5]. Starting from this, it is the aim of the present work to elucidate the nature, the conditions of formation, and the stability of paramagnetic particles in the structure of nonirradiated calcium sulfite (CaSO 3 ), which is necessary for further evaluation of their contribution to the unknown value of the absorbed dose in natural carbonates.Experimental Technique. Calcium sulfite was synthesized at 20 o C by adding a solution of sodium sulfite to a solution of calcium chloride with subsequent filtering of the sediment and drying of it in air without heating. The purity of the salt obtained was controlled by x-ray phase analysis and IR spectroscopy. We used a DRON-3 x-ray diffractometer and a Prote ′ ge ′ 760 IR Fourier-spectrophotometer (Nicolet, USA). Specimens were tableted together with KBr.The calcium sulfite obtained was divided into two parts, one of which was ground u...

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“…Ikeya and Ohmura, 1981;Radtke et al, 1985;Molodkov, 1988Molodkov, , 1989Katzenberger et al, 1989;Skinner, 1989). But only scanty data are available on palaeodosimetric and radiospectroscopic properties of non-marine mollusc shells, and even these are mainly the results of earlier studies on fresh-water gastropods (Molodkov, 1988(Molodkov, , 1996.…”

Section: Esr-dating Of Shell Fossilsmentioning

confidence: 99%

ESR dating evidence for early man at a Lower Palaeolithic cave-site in the Northern Caucasus as derived from terrestrial mollusc shells

Molodkov¹

2001

Quaternary Science Reviews

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Temperature experiments on mollusc samples: an approach to ESR signal identification

Cited by 48 publications

References 5 publications

ESR investigation of gamma irradiated sulbactam sodium

ESR investigation of gamma irradiated sulbactam sodium

Stabilization of Ion-Radicals in the Structure of Calcium Sulfite

ESR dating evidence for early man at a Lower Palaeolithic cave-site in the Northern Caucasus as derived from terrestrial mollusc shells

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