Physics Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Health Physics Section, King Faisal Specialist Hospital and Research Centre, Riyadh 11564, Saudi Arabia.
Sensors (Basel). 2023 Jan 16;23(2):1011. doi: 10.3390/s23021011.
The production of thermoluminescence (TL) dosimeters fabricated from BO-CaF-AlO-SiO doped with Cu and Pr for use in diagnostic radiology is the main goal of this research. The TL samples were synthesized via the melt-quench technique processed by melting the mixture at 1200 °C for 1 h, and, after cooling, the sample thus created was divided into two samples and retreated by heating for 2 h (referred to as TLV30) and for 15 h (referred to as TLV17). SEM and EDS analyses were performed on the TL samples to confirm the preparation process and to investigate the effects of irradiation dosimetry on the TL samples. Furthermore, the TL samples were irradiated with γ-rays using a 450 Ci Cs irradiator and variable X-ray beams (5-70 mGy). Two important diagnostic radiology applications were considered: CT (6-24 mGy) and mammography (2.72-10.8 mGy). Important dosimetric properties, such as the glow curves, reproducibility, dose-response linearity, energy dependence, minimum dose detectability and fading, were investigated for the synthetized samples (TLV17 and TLV30), the results of which were compared with the Harshaw TLD-100. The TLV17 dosimeter showed higher sensitivity than TLV30 in all applied irradiation procedures. The dose-response linearity coefficients of determination R for TLV17 were higher than TLD-100 and TLV30 in some applications and were almost equal in others. The reproducibility results of TLV17, TLV30 and TLD-100 were less than 5%, which is acceptable. On the other hand, the results of the fading investigations showed that, in general, TLV17 showed less fading than TLV30. Both samples showed a significant decrease in this regard after the first day, and then the signal variation became essentially stable though with a slight decrease until the eighth day. Therefore, it is recommended to read the TL dosimeters after 24 h, as with TLD-100. The SEM images confirmed the existence of crystallization, whilst the EDS spectra confirmed the presence of the elements used for preparation. Furthermore, we noticed that TLV17 had grown dense crystals that were larger in size compared to those of TLV30, which explains the higher sensitivity in TLV17. Overall, despite the fading, TLV17 showed greater radiation sensitivity and dose-response linearity compared with TLD-100. The synthetized TL samples showed their suitability for use as dosimeters in diagnostic radiology radiation dosimetry.
本研究的主要目标是制备用于诊断放射学的掺 Cu 和 Pr 的 BO-CaF-AlO-SiO 玻璃陶瓷热释光（TL）剂量计。通过在 1200°C 下熔融 1 小时来合成 TL 样品，然后冷却，将得到的样品分成两份，分别进行 2 小时（称为 TLV30）和 15 小时（称为 TLV17）的再加热处理。对 TL 样品进行 SEM 和 EDS 分析，以确认制备过程，并研究辐照剂量对 TL 样品的影响。此外，使用 450 Ci Cs 辐照器和可变 X 射线束（5-70 mGy）对 TL 样品进行γ射线辐照。考虑了两种重要的诊断放射学应用：CT（6-24 mGy）和乳房 X 光摄影术（2.72-10.8 mGy）。研究了合成样品（TLV17 和 TLV30）的重要剂量学特性，如发光曲线、重现性、剂量响应线性度、能量依赖性、最小剂量探测能力和退色性，其结果与 Harshaw TLD-100 进行了比较。在所有应用的辐照程序中，TLV17 剂量计的灵敏度均高于 TLV30。在某些应用中，TLV17 的剂量响应线性度决定系数 R 高于 TLD-100 和 TLV30，而在其他应用中则几乎相等。TLV17、TLV30 和 TLD-100 的重现性结果小于 5%，这是可以接受的。另一方面，退色研究结果表明，一般来说，TLV17 的退色程度低于 TLV30。两种样品在第一天之后都明显减少，然后信号变化变得基本稳定，尽管略有减少，直到第八天。因此，建议在 24 小时后读取 TL 剂量计，与 TLD-100 一样。SEM 图像证实了结晶的存在，而 EDS 谱证实了制备所用元素的存在。此外，我们注意到 TLV17 生长出的晶体密度较大，尺寸也较大，这解释了 TLV17 灵敏度较高的原因。总的来说，尽管存在退色现象，但 TLV17 显示出比 TLD-100 更高的辐射灵敏度和剂量响应线性度。合成的 TL 样品表明它们适合用作诊断放射学辐射剂量计的剂量计。
