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首页> 外文期刊>Journal of magnetic resonance >Spin Concentration in a Possible ESR Dosimeter: An Electron Spin Echo Study of X-Irradiated Ammonium Tartrate
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Spin Concentration in a Possible ESR Dosimeter: An Electron Spin Echo Study of X-Irradiated Ammonium Tartrate

机译：可能的ESR剂量计中的自旋浓度：X辐照酒石酸铵的电子自旋回波研究

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摘要

Several single crystals and powder samples of ammonium tartrate, recently proposed as a possible ESR dosimeter, have been X-irradiated with different doses. The total radical concentration has been determined by quantitative cw ESR, by comparison with a standard. The samples have been studied by electron spin echo simulated by a single exponential function for different values of the microwave power of the pulses and for different pulse lengths. The dependence of the phase memory time T_M on the microwave power has been exploited to get information on the contribution of the instantaneous diffusion to spin dephasing. At room temperature in the range of radical concentrations of 10~(18)-10~(19) spins/cm~3 the instantaneous diffusion is the dominant spin dephasing mechanism. The linear dependence of the radicals is in agreement with the theory. Form the latter results we conclude that the average radical-radical distance corresponds to a random distribution of the radicals in the matrix. A simple method of measuring the radical concentration by the ESE decays in powder samples of irradiated ammonium tartrate is described.
机译：最近提出了几种酒石酸铵单晶和粉末样品作为可能的ESR剂量计，并用不同剂量进行了X射线辐照。总自由基浓度已通过定量cw ESR与标准品比较而确定。已通过电子自旋回波对样本进行了研究，该电子自旋回波由单个指数函数模拟，用于脉冲的微波功率的不同值和脉冲长度的不同。已经利用了相存储时间T_M对微波功率的依赖性来获得有关瞬时扩散对自旋移相的贡献的信息。在室温下，自由基浓度在10〜（18）-10〜（19）spins / cm〜3范围内，瞬时扩散是主要的自旋相移机理。自由基的线性相关性与理论相符。从后者的结果可以得出结论，平均自由基自由基距离对应于自由基在矩阵中的随机分布。描述了一种通过ESE衰减测量酒石酸铵铵粉末样品中自由基浓度的简单方法。

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