Abstract Thermoluminescence data for several materials show that there are measurable differences between signals from crystalline and powder variants. With examples starting with crystalline calcite, Iceland Spar, and aragonite, and calcium fluoride (with rare earth impurities) the crushed material has altered signals. The changes are variously (i) alterations in the relative intensities of the glow peaks, (ii) modifications of the emission spectra, (iii) higher intensity per unit weight from the powdered material and (iv) examples with different numbers of peaks. (v) Whilst the thermoluminescence peaks sometimes appear at lower temperatures, which is consistent with features (i) to (iv), caution is required as there can be experimental reasons which also result in lowered temperatures. These include altered thermal coupling and/or temperature gradients at the sample heater. The scale of potential experimental variations is surprisingly large, and they have relevance to all thermoluminescence studies. Examples of such effects have been noted and new suggestions to minimise them are presented.

中文翻译：

---

晶体和粉末样品的热释光信号比较

摘要 几种材料的热释光数据表明，结晶变体和粉末变体的信号之间存在可测量的差异。以结晶方解石、冰岛晶石、文石和氟化钙（含稀土杂质）开始的例子，粉碎的材料已经改变了信号。这些变化是不同的（i）辉光峰的相对强度的改变，（ii）发射光谱的修改，（iii）粉末材料每单位重量的更高强度和（iv）具有不同数量峰的例子。(v) 虽然热释光峰有时出现在较低温度下，这与特征 (i) 至 (iv) 一致，但需要谨慎，因为可能存在也会导致温度降低的实验原因。这些包括样品加热器处改变的热耦合和/或温度梯度。潜在实验变化的规模惊人地大，并且它们与所有热释光研究相关。已注意到此类影响的示例，并提出了将其最小化的新建议。