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Abstract
Serguei E. Pashenko and Yuri V. Dublyansky-Generation of Cave Aerosols by Alpha Particles: Critical Evaluation of the Hypothesis. Journal of Cave and Karst Studies 59(3): 103- 105. The size distribution continuously changes inside the cave . Concentration of large particles (2,5-3,0 mcm) increases. 1 – out-cave, 2 – grotto Kollizei, 3 – Centralnii, 4 -Efirnii, 5 –Big Lake. GENERATION OF CAVE AEROSOLS BY ALPHA PARTICLES: CRITICAL EVALUATION OF THE HYPOTHESIS SERGUEI E. PASHENKO Institute of Chemical Kinetics and Combustion, Russian Academy of Sciences, Siberian Branch, 3 Institutskaya Str., 630090, Novosibirsk, RUSSIA YURI V. DUBLYANSKY Institute of Mineralogy and Petrography, Russian Academy of Sciences, Siberian Branch, 3 University Avenue, 630090, Novosibirsk, RUSSIA e-mail: dublyan@uiggm.nsc.ru The paper evaluates the feasibility of the hypothetical mechanism of cave aerosols generation under the action of natural radioactivity. Analysis has been performed from the standpoints of nuclear physics and aerosol mechanics. The hypothetical mechanism involves dislodgment of atoms and ions and knocking- out of larger fragments due to the bombardment of the bedrock by alpha-particles residing in the cave air. Calculations show that the largest amount of atoms and ions that could be generated by alpha-bom- bardment does not exceed 0.1 g from 1000 m2 of the cave surface per 1 million years a quite negligible value. Presence of any water film thicker than 0.1 micron on the cave wall would completely prevent the dislodgment. The hypothetical mechanism, though physically plausible, cannot play any essential role in the generation of cave aerosols, and much less in the formation of speleothems.


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