In this study, the structural, morphological, photoluminescence (PL), and dosimetric properties of Ca2-xAl2SiO7: xCr3+, at various Cr3+ concentrations (0 ≤ x ≤ 1 mol%) have been studied. The phosphor material was synthesized via sol-gel route with an octadecylamine as a catalyst. The average crystallite sizes were estimated to be in the range 21–30 nm using the modified Scherrer method which are in good agreement with data yielded by TEM micrographs. The energy-dispersive X-ray (EDX) spectra with scanning electron microscope (SEM) data confirm the homogeneous existence, and distribution of constituent elements within the structure and approved the sol-gel preparation method. PL spectra shows that Cr3+ doped Ca2Al2SiO7 structure has shoulder broadening and maximum peaks maintained at 442 ± 3.0 and 491 ± 3.02 nm upon 337 nm excitation which caused by 4F (4A2→4T2), 4F (4A2→4T1), and 4P (4A2→4T1) electronic spin-allowed transitions. Thermoluminescenc (TL) sensitivity characteristics of the obtained samples were scrutinized using Co-60 γ-radiation source. Cr0.4 sample was found to be optimum and its TL intensity increases linearly with increasing γ-doses from 0.5 up to 10 Gy. An accuracy using relative standard deviation (RSD) calculations of the homogenous study for Cr0.4 was found to be 4.02% (<10%, accepted due to ISO rules). Threshold dose of Cr0.4 sample was computed to be about 258 μGy. Acquired results of photon attenuation parameters estimations of Ca2Al2SiO7 composition using Phy-X PSD online program show that this composition is a bone equivalent dosimeter. According to this article, Cr0.4 doped Ca2Al2SiO7 sample can be considered as useful TL-material in various dosimetric applications.

中文翻译：

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溶胶-凝胶路线制备 Cr3+ 活化的 Ca2Al2SiO7 纳米荧光粉的合成、形貌和剂量学性能


在本研究中，研究了不同 Cr3+ 浓度 （0 ≤ x ≤ 1 mol%） 的 Ca2-xAl2SiO7： xCr3+ 的结构、形态学、光致发光 （PL） 和剂量学特性。以十八胺为催化剂，通过溶胶-凝胶路线合成了荧光粉材料。使用改进的 Scherrer 方法估计平均晶粒尺寸在 21-30 nm 范围内，这与 TEM 显微照片产生的数据非常一致。带有扫描电子显微镜 （SEM） 数据的能量色散 X 射线 （EDX） 光谱证实了结构内组成元素的均匀存在和分布，并批准了溶胶-凝胶制备方法。PL光谱显示，Cr3+掺杂的Ca2Al2SiO7结构在337 nm激发下具有肩部展宽，在337 nm激发下，最大峰保持在442 ± 3.0和491 ± 3.02 nm处，这是由4F （4A2→4T2）、4F （4A2→4T1） 和 4P （4A2→4T1） 电子自旋允许跃迁引起的。使用 Co-60 γ 辐射源仔细检查所获得样品的热释光 （TL） 灵敏度特性。发现 Cr0.4 样品是最佳的，其 TL 强度随着 γ 剂量从 0.5 Gy 增加到 10 Gy 线性增加。使用 Cr0.4 均质研究的相对标准偏差 （RSD） 计算的准确度为 4.02%（<10%，由于 ISO 规则而被接受）。计算出 Cr0.4 样品的阈值剂量约为 258 μGy。使用 Phy-X PSD 在线程序对 Ca2Al2SiO7 组成的光子衰减参数估计的获得结果表明，该成分是骨等效剂量计。根据本文，Cr0.4 掺杂的 Ca2Al2SiO7 样品可以被认为是各种剂量学应用中有用的 TL 材料。