Data for Technical note: Darkroom lighting for luminescence dating laboratory

An optimal lighting setting for the darkroom laboratory is fundamental for the accuracy of luminescence dating results. Here, we present the lighting setting implemented in the new Luminescence Dating Research Laboratory at Stony Brook University, USA. In this study, we performed spectral measurements on different light sources and filters. Then, we measured the optically stimulated luminescence (OSL) signal of quartz and the infrared stimulated luminescence (IRSL) at 50 °C (IR50) as well as post-IR IRSL at 290 °C (pIRIR290) signal of potassium (K)-rich feldspar samples exposed to various light sources and durations. Our ambient lighting is provided by ceiling fixtures, each equipped with a single orange light-emitted diode (LED). In addition, our task-oriented lighting, mounted below each wall-mounted cabinet and inside the fume hoods, is equipped with a dimmable orange LED stripline. The ambient lighting, delivering 0.4 lux at the sample position, induced a loss of less than 5 % (on average) in the quartz OSL dose after 24 h of exposure, and up to 5 % (on average) in the IR50 dose for the K-rich feldspar samples, with no measurable effect on their pIRIR290 dose. The fume hood lighting, delivering 1.1 lux at the sample position, induced a dose loss of less than 5 % in quartz OSL and K-rich feldspar IR50 doses after 24 h of exposure, with no measurable effect on their pIRIR290 dose. As light exposure during sample preparation is usually less than 24 h, we conclude that our lighting setting is suitable for luminescence dating darkrooms, it is simple, inexpensive to build, and durable.暗室实验室的最佳光照设置，是保障光释光测年结果准确性的核心前提。在此，我们介绍美国石溪大学（Stony Brook University）新建光释光测年研究实验室所采用的光照设置方案。本研究中，我们首先对不同光源与滤光片开展了光谱测量；随后，针对暴露于各类光源且照射时长各异的富钾（K）长石样品，依次测定了石英的光释光（Optically Stimulated Luminescence, OSL）信号、50℃条件下的红外释光（Infrared Stimulated Luminescence, IRSL）信号（即IR50），以及290℃条件下的红外后释光（post-IR IRSL）信号（即pIRIR290）。我们的环境照明采用天花板灯具，每盏灯具搭载单颗橙色发光二极管（light-emitted diode, LED）。此外，每台挂墙柜下方及通风橱内部配备的定向照明装置，均搭载可调光的橙色LED灯带。环境照明在样品放置位置的照度为0.4勒克斯，经24小时持续照射后，石英OSL剂量的平均损失小于5%；富钾（K）长石样品的IR50剂量平均损失可达5%，而对其pIRIR290剂量无可观测影响。通风橱照明在样品位置的照度为1.1勒克斯，经24小时照射后，石英OSL与富钾（K）长石IR50剂量的损失均小于5%，且对其pIRIR290剂量无可观测影响。鉴于样品制备过程中的光照时长通常不足24小时，我们认为该光照设置适用于光释光测年专用暗室：其构造简便、搭建成本低廉且耐用性优异。