Experimental study of 210Po release from 17Li83Pb eutectic

Autor:	N. Borisov, O. Schipakin, S. Churkin
Rok vydání:	1995
Předmět:	Materials science Argon Mechanical Engineering Analytical chemistry Evaporation Humidity chemistry.chemical_element Sorption Aerosol chemistry.chemical_compound Nuclear Energy and Engineering chemistry Hydroxide General Materials Science Civil and Structural Engineering Eutectic system Polonium
Zdroj:	Fusion Engineering and Design. 29:164-169
ISSN:	0920-3796
DOI:	10.1016/0920-3796(95)80018-s
Popis:	The release of 210Po from 17Li83Pb eutectic was experimentally investigated up to 450 °C in flows of noble gases and atmospheric air at different humidity. Aerosol and sorption filters were applied for the quantitative determination of releasing polonium aerosol and gaseous fractions. The experimental results reveal the strong dependence of 210Po release rate on temperature and the state of the eutectic surface. In the eutectic temperature range from 350 to 450 °C the polonium release rate in argon is increasing from 10−11 to 10−9 Ci cm−2 h−1. In all tests the 210Po activity in the carrier gas was determined in aerosol and gaseous forms. Polonium in the gaseous phase was found to be in the range from 5% to 80% of the overall concentration. The total 210Po concentration in the carrier gas near the melted eutectic surface at the temperature 450 °C reached 2.7 × 10−10 Ci 1−1, which exceeds the permissible level by three orders of magnitude. Comparison of experimental data with estimates based on metallic polonium evaporation indicates the formation of chemical compounds of polonium with lead and in some cases with hydroxide.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2f3d1188ca75f39418b4f163be1f7686 https://doi.org/10.1016/0920-3796(95)80018-s Zobrazit plný text záznamu Full Text from ScienceDirect