In situ production of alpha particles and alpha recoil particles in quartz applied to ESR studies of oxygen vacancies
In situ production of alpha particles and alpha recoil particles in quartz applied to ESR studies of oxygen vacancies
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石英中α粒子和α反冲粒子的原位产生应用于氧空位的ESR研究
DOI：
10.1016/s0277-3791(00)00018-4
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发表时间：
2001
影响因子：
4
通讯作者：
T. Kagami
中科院分区：
文献类型：
--
作者：
S. Toyoda;W. Rink;C. Yonezawa;H. Matsue;T. Kagami
与石英中氧空位（E1'中心和热处理的E1'中心）相关的ESR信号强度与其母岩的辐射年龄相关。氧空位的产生有两个自然过程：(1) 沿 α 反冲和 α 粒子轨迹的晶格损伤；(2) 来自高能电子（β 粒子）和伽马光子的随机分布的电离损伤。本文的目的是确定轨道损伤过程相对于电离过程是否占主导地位。热处理的 E1' 中心被认为是氧空位浓度的替代测量。石英的原位α辐射是通过中子辐射含锂和硼的石英来完成的。我们发现，通过 ESR 测量的氧空位数量比使用 Ziegler TRIM 软件计算损伤时估计的值高出 2 倍。考虑到 ESR 信号自旋浓度绝对测定的不确定性，该一致性非常好，并支持这样的理论：α 粒子损伤是石英在数亿年的自然辐射过程中氧空位产生的主要原因。
The intensity of an ESR signal associated with oxygen vacancies in quartz (E1′ center and heat-treated E1′ center) are correlated with the radiometric age of their host rocks. Two natural processes are responsible for the production of oxygen vacancies (1) lattice damage along alpha recoil and alpha particle tracks and (2) randomly distributed ionization damage from energetic electrons (beta particles) and gamma photons. The aim of this paper was to determine whether the track damage process is dominant relative to the ionization processes. Heat-treated E1′ centers are considered a proxy measure of the oxygen vacancy concentration. In situ alpha irradiation of quartz was accomplished by neutron irradiation of lithium and boron-bearing quartz. We found that the oxygen vacancy population measured by ESR was a factor of 2 higher than estimated from calculations of the damage using Ziegler's TRIM software. Considering the uncertainties in absolute determinations of spin concentration from ESR signals, the agreement is very good and supports the theory that alpha particle damage is largely responsible for oxygen vacancy production during natural irradiation of quartz over intervals of hundreds of millions of years.
影响因子：
0.8
作者：
S. Toyoda;M. Ikeya
通讯作者：
S. Toyoda;M. Ikeya