The Diffusion of Tc-99 in Beishan Granite-Temperature Effect
The Diffusion of Tc-99 in Beishan Granite-Temperature Effect作者机构：Beijing National Laboratory for Molecular Science Radiochemistry & Radiation Chemistry Key Laboratory for Fundamental Science College of Chemistry and Molecular Engineering Peking University Beijing China Beijing National Laboratory for Molecular Science Radiochemistry & Radiation Chemistry Key Laboratory for Fundamental Science College of Chemistry and Molecular Engineering Peking University Beijing China North China Electric Power University Beijing China
出 版 物：《World Journal of Nuclear Science and Technology》 (核科学与技术国际期刊（英文）)
年 卷 期：2013年第3卷第1期
页 面：33-39页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Diffusion Technetium Beishan Granite Temperature Effect
摘 要：In the safety assessment of a potential site for high-level radioactive wastes (HLW) disposal, the investigation on the geochemical behaviors of key radionuclides with the possibility for releasing from the potential repository is an important aspect. Due to the high mobility of technetium under most repository conditions, lots of research works were performed to investigate the diffusion of technetium in different potential rocks. In spite of these studies, there remains a lack of data addressing temperature effects. In this paper, the diffusion of 99Tc in Beishan granite at temperatures from 25℃ to 55℃ was studied with laboratory small scale diffusion devices. The experimental data were fitted with a finite difference scheme to get the effective diffusion coefficient (De) of . The results indicated that the relationship of De with temperatures could be described as the modified Stokes-Einstein equation, and the formation factor of Beishan granite was constant in the temperature range of 25℃ - 55℃ with the value of (3.91 ± 1.77) × 10-4.
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