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首页> 美国政府科技报告 >Preparation and Characterization of Cesium-137 Aluminosilicate Pellets for Radioactive Source Applications
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Preparation and Characterization of Cesium-137 Aluminosilicate Pellets for Radioactive Source Applications

机译：用于放射源的铯-137硅铝酸盐球团的制备与表征

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Twenty-seven fully loaded exp 137 Cs aluminosilicate pellets were fabricated in a hot cell by the vacuum hot pressing of a cesium carbonate/montmorillonite clay mixture at 1500 exp 0 C and 570 psig. Four pellets were selected for characterization studies which included calorimetric measurements, metallography, scanning electron microscope and electron backscattering (SEM-BSE), electron microprobe, x-ray diffraction, and cesium ion leachability measurements. Each test pellet contained 437 to 450 curies of exp 137 Cs as determined by calorimetric measurements. Metallographic examinations revealed a two-phase system: a primary, granular, gray matrix phase containing large and small pores and small pore agglomerations, and a secondary fused phase interspersed throughout the gray matrix. SEM-BSE analyses showed that cesium and silicon were uniformly distributed throughout both phases of the pellet. This indicated that the cesium-silicon-clay reaction went to completion. Aluminum homogeneity was unconfirmed due to the high background noise associated with the inherent radioactivity of the test specimens. X-ray diffraction analyses of both radioactive and non-radioactive aluminosilicate pellets confirmed the crystal lattice structure to be pollucite. Cesium ion quasistatic leachability measurements determined the leach rates of fully loaded exp 137 Cs sectioned pollucite pellets to date to be 4.61 to 34.4 x 10 exp -10 kg m exp -2 s exp -1 , while static leach tests performed on unsectioned fully loaded pellets showed the leach rates of the cesium ion to date to be 2.25 to 3.41 x 10 exp -12 kg m exp -2 s exp -1 . The cesium ion diffusion coefficients through the pollucite pellet were calculated using Fick's first and second laws of diffusion. The diffusion coefficients calculated for three tracer level exp 137 Cs aluminosilicate pellets were 1.29 x 10 exp -16 m exp 2 s exp -1 , 6.88 x 10 exp -17 m exp 2 s exp -1 , and 1.35 x 10 exp -17 m exp 2 s exp -1 , respectively. (ERA citation 06:026941)

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