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/cm² for CW-OSL and linearly ramped from zero to 72 mW/cm² 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.

介绍了来自三种不同类型贝壳的连续波光受激发光 (CW-OSL) 和线性调制 OSL (LM-OSL) 的特性。对于 CW-OSL，辐照样品以 72 mW/cm ²进行光刺激，并从零线性上升到 72 mW/cm ²获得LM-OSL。测得的壳的 CW-OSL 和 LM-OSL 曲线分别由三个分量组成，即快、中和慢分量。所有样品的快速、中速和慢速 LM-OSL 分量分别在 17.0 ± 0.8、45.0 ± 1.8 和 140.8 ± 6.7 s 达到峰值。此外，峰值位置与剂量无关。从 CW-OSL 估计的三个组分的 OSL 陷阱的光电离截面类似于使用 LM-OSL 确定的那些。三种成分的 OSL 随剂量线性增加。重复测量相同等分试样的响应变异系数低于 2.3%。因此，壳是用于追溯性剂量测定的潜在材料。