中文摘要：

以随机扩散理论为基础,研究该机理下材料中氦的热释放可能呈现的特征,考察了氦的初始深度分布和扩散系数等因素对氦的热释放率的影响;阐明了随机扩散模型下和脱附模型下的氦释放特征之异同;指出对实验观察到的热解析谱的分析应和基底中氦的深度分布的分析以及氦的聚集状态的分析相结合,才能对氦的热释放机理给出正确的理解和判断.

英文摘要：

Based on the theory for random-walk with an absorption wall,the characteristics of thermal release of helium in materials are studied.The influences of the initial depth distribution and the diffusion coefficient of helium in materials on the thermal release are investigated.A comparison is made between the thermal releases induced by the random-walk mechanisms and the thermal desorption mechanisms.It is pointed out that the initial depth distribution and the states that Helium atoms stay in are required for the correct understanding of experimental observations of thermal releases of helium in materials.