In situ TEM observation of alpha-particle induced annealing of radiation damage in Durango apatite.
In situ TEM observation of alpha-particle induced annealing of radiation damage in Durango apatite.
复制标题
杜兰戈磷灰石中 α 粒子诱导退火辐射损伤的原位 TEM 观察
DOI：
10.1038/s41598-017-14379-9
复制
发表时间：
2017-10-26
影响因子：
4.6
通讯作者：
Ewing RC
中科院分区：
文献类型：
--
作者：
Li W;Shen Y;Zhou Y;Nan S;Chen CH;Ewing RC
热年代学和U-Th-Pb定年中的一个主要问题是α衰变事件产生的α反冲造成的辐射损伤对放射性元素扩散的影响（例如，到目前为止，热事件一直被认为是辐射损伤恢复的唯一能量来源。然而，辐照，例如来自α衰变事件的α粒子的辐照，本身可以诱导损伤恢复。在α衰变事件中，由于难以观察到原子尺度的恢复过程，因此无法对α粒子引起的辐射诱导恢复进行量化。在这里，我们提出了在α粒子辐照过程中，使用原位透射电子显微镜（TEM）和连续的离子辐照：1 MeV的Kr 2+（模拟α反冲损伤），其次是400 keV的He+（模拟α粒子退火）的非晶到结晶的转变过程的动力学的细节。在He+照射后，原始的完全无定形的杜兰戈磷灰石的部分再结晶是明显的，并且基于TEM图像中新的结晶域的逐渐出现和选定区域电子衍射图案中的新的衍射最大值来量化。因此，α粒子诱导退火的发生和必须考虑的α衰变事件的损害及其对放射性元素的扩散在地质年代学和热年代学的影响模型。
A major issue in thermochronology and U-Th-Pb dating is the effect of radiation damage, created by α-recoils from α-decay events, on the diffusion of radiogenic elements (e.g., He and Pb) in host mineral. Up until now, thermal events have been considered as the only source of energy for the recovery of radiation-damage. However, irradiation, such as from the α-particle of the α-decay event, can itself induce damage recovery. Quantification of radiation-induced recovery caused by α-particles during α-decay events has not been possible, as the recovery process at the atomic-scale has been difficult to observe. Here we present details of the dynamics of the amorphous-to-crystalline transition process during α-particle irradiations using in situ transmission electron microscopy (TEM) and consecutive ion-irradiations: 1 MeV Kr2+ (simulating α-recoil damage), followed by 400 keV He+ (simulating α-particle annealing). Upon the He+ irradiation, partial recrystallization of the original, fully-amorphous Durango apatite was clearly evident and quantified based on the gradual appearance of new crystalline domains in TEM images and new diffraction maxima in selected area electron diffraction patterns. Thus, α-particle induced annealing occurs and must be considered in models of α-decay event damage and its effect on the diffusion of radiogenic elements in geochronology and thermochronology.
登录
查看更多内容
影响因子：
3.2
作者：
DIENES, GJ;DAMASK, AC
通讯作者：
DAMASK, AC
影响因子：
11.9
作者：
Jay, Eleanor E.;Fossati, Paul C. M.;Grimes, Robin W.
通讯作者：
Grimes, Robin W.
影响因子：
5.3
作者：
Li, Weixing;Wang, Lumin;Ewing, Rodney C.
通讯作者：
Ewing, Rodney C.
DOI：
10.1016/j.nimb.2013.03.010
发表时间：
2013-05-01
影响因子：
1.3
作者：
Li, Weixing;Rodriguez, Matias D.;Ewing, Rodney C.
通讯作者：
Ewing, Rodney C.
影响因子：
4.6
作者：
Mir, Anamul H.;Toulemonde, M.;Peuget, S.
通讯作者：
Peuget, S.