Alpha-decay induced shortening of fission tracks simulated by in situ ion irradiation
Alpha-decay induced shortening of fission tracks simulated by in situ ion irradiation
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原位离子辐照模拟阿尔法衰变引起的裂变径迹缩短
DOI：
10.1016/j.gca.2021.01.022
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发表时间：
2021-04
影响因子：
5
通讯作者：
Rodney C. Ewing
中科院分区：
文献类型：
--
作者：
Weixing Li;Yuanyuan Chen;Lei Feng;Jingjing Niu;Yingxin Liu;Vladimir Skuratov;Maxim V. Zdorovets;Lynn A. Boatner;Rodney C. Ewing
缺陷的扩散（例如，空位和空位）和用于定年的元素（例如，He和Pb）是一个热过程：这是用于确定矿物年龄和热历史的主要假设。例如，通过238U自发裂变产生的径迹的数目和长度分布，假设热事件是缩短裂变径迹的唯一能量源，就可以重建热历史。在这里，我们报告了一种新的，非热能源，诱导额外的裂变径迹的α衰变的α反冲238 U和232 Th的照射缩短。我们模拟α衰变诱导的轨道缩短相结合的离子加速器辐照与透射电子显微镜。这允许在原位照射期间首次观察到径迹收缩。我们表明，而不是α粒子，α反冲诱导核碰撞裂变轨道显着缩短。径迹长度的缩短可以量化为α衰变事件剂量的函数。然而，磷灰石对这种非热过程的敏感性低于锆石。这些发现揭示了单个矿物颗粒中α粒子、α反冲和裂变碎片核的不同类型自辐射之间的相互作用，对锆石和磷灰石在放射性测年和热年代学中的应用具有重要意义。
The diffusion of defects (e.g., vacancies and interstitials) and elements used for dating (e.g., He and Pb) in a mineral structure is a thermal process: This is the primary assumption used to determine the age and thermal history of minerals. For instance, thermal history reconstruction, through the number and length distribution of tracks produced by spontaneous fission of238U, is obtained by assuming a thermal event to be the only energy source for shortening of fission tracks. Here, we report a new, non-thermal energy source that induces additional shortening of fission tracks by the irradiation of alpha-recoils from the alpha-decay of238U and232Th. We simulate alpha-decay induced track-shortening by combining ion accelerator irradiations with transmission electron microscopy. This allows for the first observation of track-shrinkage duringin situion irradiation. We show that rather than alpha-particles, alpha-recoils induce a significant shortening of fission tracks by nuclear-collisions. The shortening of track-length can be quantified as a function of alpha-decay event dose. However, apatite is less sensitive than zircon to this non-thermal process. The findings exemplify the interactions among different types of self-irradiation from alpha-particles, alpha-recoils and fission-fragment nuclei in single mineral grains and have important implications for the use of zircon and apatite for radiometric dating and thermochronology.
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影响因子：
5
作者：
K. Crowley;M. Cameron;R. Schaefer
通讯作者：
K. Crowley;M. Cameron;R. Schaefer
DOI：
10.1016/1359-0189(90)90051-x
发表时间：
1990
期刊：
International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements
影响因子：
--
作者：
A. Carter
通讯作者：
A. Carter
影响因子：
3.9
作者：
Barbarand, J;Hurford, T;Carter, A
通讯作者：
Carter, A
DOI：
10.1007/978-94-007-6326-5_5-1
发表时间：
2014
期刊：
--
影响因子：
--
作者：
A. Gleadow;C. Seiler
通讯作者：
A. Gleadow;C. Seiler
影响因子：
56.9
作者：
M. House;M. Gurnis;P. Kamp;R. Sutherland
通讯作者：
M. House;M. Gurnis;P. Kamp;R. Sutherland