Annalakshmi O, Jose M T, Madhusoodanan U
Radiological Safety Division, Radiological Safety and Environmental Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India.
Radiat Prot Dosimetry. 2012 Jun;150(2):127-33. doi: 10.1093/rpd/ncr379. Epub 2012 Jan 5.
Polycrystalline powder samples of BaSO(4) doped with Eu(2+) were prepared by solid-state reaction in different reducing atmospheres. Photoluminescence (PL), thermoluminescence (TL), TL kinetic and dosimetric studies have been carried out in this phosphor. The TL glow curve of BaSO(4):Eu(2+) showed only a single peak at 513 K unlike other phosphors and the TL intensity is about three to four times higher than that of CaSO(4):Dy, which is currently used as the radiation dosemeter for personnel monitoring in India. The TL dose response of the phosphor was found to be linear up to the dose range of 10(3) Gy beyond which saturation sets in. PL and TL spectra showed the characteristic emission of Eu(2+) ion. The TL parameters such as trap depth (E) or the energy required to release the electron or hole from the trap, frequency factor (s) and the order of kinetics (b) are determined by different methods such as isothermal decay, initial rise and variable heating rate.
通过在不同还原气氛下的固态反应制备了掺杂 Eu(2+) 的 BaSO(4) 多晶粉末样品。对该磷光体进行了光致发光（PL）、热释光（TL）、TL 动力学和剂量学研究。与其他磷光体不同，BaSO(4):Eu(2+) 的 TL 发光曲线在 513 K 处仅显示一个单峰，并且 TL 强度比目前在印度用作人员监测辐射剂量计的 CaSO(4):Dy 高约三到四倍。发现该磷光体的 TL 剂量响应在高达 10(3) Gy 的剂量范围内呈线性，超过此剂量范围则出现饱和。PL 和 TL 光谱显示了 Eu(2+) 离子的特征发射。通过等温衰减、初始上升和可变加热速率等不同方法确定了诸如陷阱深度（E）或从陷阱中释放电子或空穴所需的能量、频率因子（s）和动力学级数（b）等 TL 参数。
