Department of Physics, University of Ibadan, Ibadan, Oyo State, Nigeria.
Department of Physics and Electronics, Rhodes University, Grahamstown, 6140, South Africa.
Appl Radiat Isot. 2021 Jan;167:109463. doi: 10.1016/j.apradiso.2020.109463. Epub 2020 Oct 8.
Characteristics of continuous wave optically stimulated luminescence (CW-OSL) and linear modulation OSL (LM-OSL) from three different types of cowrie shells are presented. Irradiated samples were optically stimulated at 72 mW/cm for CW-OSL and linearly ramped from zero to 72 mW/cm to obtain LM-OSL. The measured CW-OSL and LM-OSL curves of the shells are each determined to consist of three components namely fast, medium and slow components. The fast, medium and slow LM-OSL components peak at 17.0 ± 0.8, 45.0 ± 1.8 and 140.8 ± 6.7 s respectively for all samples. In addition, peak positions are independent of dose. The photoionization cross-sections of the OSL traps for the three components estimated from CW-OSL are similar to those determined using LM-OSL. The OSL of the three components increases linearly with dose. The coefficient of variation of responses from repeated measurements of same aliquot lies below 2.3%. The shells are thus potential materials for retrospective dosimetry.
本文介绍了三种不同类型的宝贝螺的连续波光激励发光 (CW-OSL) 和线性调制光激励发光 (LM-OSL) 的特征。辐照后的样品在 72 mW/cm 的光强度下进行 CW-OSL 光激励，并线性从零增加到 72 mW/cm 以获得 LM-OSL。测量得到的宝贝螺壳的 CW-OSL 和 LM-OSL 曲线各由三个分量组成，分别为快、中、慢分量。对于所有样品，LM-OSL 的快、中、慢分量的峰值分别为 17.0±0.8、45.0±1.8 和 140.8±6.7 s。此外，峰值位置与剂量无关。从 CW-OSL 估算的三个 OSL 陷阱的光致离化截面与使用 LM-OSL 确定的截面相似。三个分量的 OSL 随剂量线性增加。从同一等分试样的重复测量得到的响应的变异系数低于 2.3%。因此，这些宝贝螺是潜在的回溯剂量学材料。
