Oxalate molecule as the trap for γ-irradiation energy in the amorphous aluminosilicate Al2(OH)6H4SiO4

• Published in: Radiation research Vol. 123; no. 1; pp. 102 - 104
• Main Authors: NOTHIG-LASLO, V, HORVATH, L, BILINSKI, H
• Format: Journal Article
• Language: English
• Published: Oak Brook, Il Radiation Research Society 01-07-1990
• Subjects: ALUMINIUM COMPOUNDS; ALUMINIUM SILICATES; Aluminum Silicates - radiation effects; Biological and medical sciences; CARBOXYLIC ACID SALTS; CHEMISTRY; COBALT ISOTOPES; Cobalt Radioisotopes; ELECTROMAGNETIC RADIATION; ELECTRON SPIN RESONANCE; Electron Spin Resonance Spectroscopy; Fundamental and applied biological sciences. Psychology; GAMMA RADIATION; Gamma Rays; IONIZING RADIATIONS; ISOTOPES; MAGNETIC RESONANCE; OXALATES; Oxalic Acid; OXYGEN COMPOUNDS; PRECIPITATION; RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; RADIATIONS; RADIOCHEMISTRY; RESONANCE; SEPARATION PROCESSES; SILICATES; SILICON COMPOUNDS 400600 > Radiation Chemistry; Space life sciences; Tissues, organs and organisms biophysics; TRAPPING; Oxalate; Trap; Gamma radiation
• ISSN: 0033-7587; 1938-5404
• DOI: 10.2307/3577664

Paramagnetic species which were the products of gamma irradiation at 77 K and at room temperature were studied by ESR spectroscopy in the amorphous aluminosilicate, Al2(OH)6H4SiO4, prepared in the presence and in the absence of oxalate ion. The aluminosilicate precipitated from the solution containing the oxalate ion in 10(-4) mol dm-3 concentration contained the oxalate only in trace amounts. When gamma-irradiated at 77 K and at room temperature, this compound gave the stable paramagnetic species represented by the single ESR line centered at g = 2.000. We ascribe this spectrum to the CO2- radical formed from the oxalate ion. The same aluminosilicate prepared in the absence of the oxalate either produced no stable paramagnetic product after gamma irradiation at room temperature or resulted in composite ESR spectra, indicating the presence of several paramagnetic species if irradiated at 77 K. Complex ESR spectra were transformed by heating to the stable paramagnetic centers which differed from the one obtained from oxalate ion. We conclude that in Al2(OH)6H4SiO4 oxalate acts as a trap for the gamma-radiation energy.