Boron assisted low temperature immobilization of iodine adsorbed by silver-coated silica gel
To immobilize the radioactive iodine isotopes, a series of borosilver silica gel glasses with iodine loaded in silver-coated silica gel ranging from 20 to 30 wt% (I− content in each sample was 8 wt%) had been successfully immobilized by muffle furnace from 450 °C to 550 °C for 6 h. With the increase...
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Published in | Journal of nuclear materials Vol. 526; p. 151758 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.12.2019
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | To immobilize the radioactive iodine isotopes, a series of borosilver silica gel glasses with iodine loaded in silver-coated silica gel ranging from 20 to 30 wt% (I− content in each sample was 8 wt%) had been successfully immobilized by muffle furnace from 450 °C to 550 °C for 6 h. With the increase of I− in silver-coated silica gel, optimum sintering temperatures corresponding to the maximum amorphous fraction in each system decreased from 550 °C (0.98) to 490 °C (0.68) and finally to 460 °C (0.66). The IR spectrums results show that the vitrified matrix is mainly consisted of [BO3] and [SiO4]. The SEM-EDS patterns show that iodine is uniformly distributed in the sample loaded with 20 wt% of iodine in silver-coated silica gel. In addition, the specimen shows lower porosity with higher amorphous fraction. Our findings demonstrate the potential of boron for the immobilization of silver-coated silica gel with different radioactive iodine loadings. |
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ISSN: | 0022-3115 1873-4820 |
DOI: | 10.1016/j.jnucmat.2019.151758 |