This work shows the results of optically stimulated luminescence (OSL) and radiocarbon (14C) dating applied to mortars of historical structures in northern Italy. All the results are compared with archaeological evidence and thermoluminescence (TL) dating of bricks. The main issue for OSL mortar dating is that the quartz grains contained in the mortar may be only partially bleached, leading to an overestimation of the sample age. In order to identify the best protocol to apply, both multi-grain (MG) and single grain (SG) methods were used. The minimum age model (MAM) statistical approach was applied to refine their accuracy. However, the identification of the bleached grains is not always successful, indicating that further investigations are needed to develop suitable dating protocol. For the 14C technique, a crucial aspect is the selection of anthropogenic calcite. In this work the mortars were treated using a Cryosonic method to select anthropogenic calcite from raw material, and the obtained powder was sieved to select the finer fraction. Unfortunately, only in two cases an acceptable amount of sample could be obtained. All the fractions were dated via accelerator mass spectrometry (AMS), and the results compared with independently obtained dates. The results show that the execution of the dating analysis requires previous characterizations to assess the nature of the mortar components and avoid unusable fractions.

中文翻译：

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Milano-Bicocca 实验室砂浆的发光和放射性碳测年

这项工作显示了光受激发光 (OSL) 和放射性碳 (14C) 测年适用于意大利北部历史建筑的砂浆。所有结果都与考古证据和砖的热释光 (TL) 测年进行了比较。OSL砂浆测年的主要问题是砂浆中所含的石英颗粒可能仅部分漂白，导致样品年龄被高估。为了确定要应用的最佳协议，使用了多粒 (MG) 和单粒 (SG) 方法。应用最小年龄模型（MAM）统计方法来提高其准确性。然而，漂白谷物的鉴定并不总是成功的，这表明需要进一步调查以制定合适的测年协议。为了14C技术中，一个至关重要的方面是人为方解石的选择。在这项工作中，使用 Cryosonic 方法处理砂浆以从原料中选择人为方解石，并将获得的粉末过筛以选择更细的部分。不幸的是，只有在两种情况下可以获得可接受的样本量。所有馏分均通过加速器质谱法 (AMS) 测定日期，并将结果与​​独立获得的日期进行比较。结果表明，进行测年分析需要先前的表征来评估砂浆成分的性质并避免不可用的部分。