The Rexon UL-320 FDR is a novel resistive-heating thermoluminescent dosimeter reader with a unique temperature measurement system and an automated dosimeter processing mechanism. The removable contact heating planchets have black-body adhesives on the back for capturing temperature information with infrared sensors. A heating cycle feedback loop ensures accurate, precise, and reproducible heating sequences. Heating rates between 0.8 and 40°C s-1 for up to 1,000 s are possible. Photomultiplier tube sensitivity and drift, dark current counts, and planchet glow were measured experimentally. Additionally, 25 LiF:Mg,Ti dosimeters were calibrated to demonstrate reader performance. Sensitivity was optimized at 1,200 V, which produced the highest reference light count to dark current count ratio while extending photomultiplier tube life. Dark current counts measured with typical time-temperature profiles for LiF:Mg,Ti were below 10 counts per channel but increased by up to 2.5% for more extreme heating cycles. Reader sensitivity drifts of up to 10% were observed during extended automated operations with typical time-temperature profiles. Total counts resulting from planchet glow decreased with faster heating rates. Calibrations performed with LiF:Mg,Ti dosimeters yielded results comparable to more established reader designs. Spikes were observed in ~3% of the glow curves from planchet dust and oil burning off at elevated temperatures. The use of N2 gas and sensitivity drift corrections are recommended to improve dosimetry performance for the UL-320 FDR reader.

中文翻译：

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Rexon UL-320-FDR 的初步体验：带有可拆卸接触式加热板和红外温度反馈系统的自动热释光剂量计读取器。

Rexon UL-320 FDR 是一款新型电阻加热热释光剂量计读取器，具有独特的温度测量系统和自动剂量计处理机制。可拆卸的接触式加热板背面有黑体粘合剂，可通过红外传感器捕获温度信息。加热循环反馈回路确保准确、精确且可重复的加热顺序。加热速率可以在 0.8 至 40°C s-1 之间，持续时间长达 1,000 秒。通过实验测量了光电倍增管的灵敏度和漂移、暗电流计数和平板发光。此外，还校准了 25 个 LiF:Mg,Ti 剂量计以展示读取器性能。灵敏度在 1,200 V 下进行了优化，产生最高的参考光计数与暗电流计数比，同时延长了光电倍增管的使用寿命。使用 LiF:Mg,Ti 的典型时间-温度曲线测量的暗电流计数低于每个通道 10 个计数，但对于更极端的加热循环，暗电流计数增加高达 2.5%。在具有典型时间-温度曲线的扩展自动化操作过程中，观察到读数器灵敏度漂移高达 10%。随着加热速率加快，板坯辉光产生的总计数减少。使用 LiF:Mg,Ti 剂量计进行的校准产生的结果与更成熟的读取器设计相当。在约 3% 的辉光曲线中观察到尖峰，这些辉光曲线来自于高温下燃烧的球状灰尘和油。建议使用氮气和灵敏度漂移校正来提高 UL-320 FDR 读取器的剂量测定性能。