基于腔衰荡光谱和量子级联Laser的放射性二氧化碳检测
Radiocarbon Dioxide detection based on Cavity Ring-Down Spectroscopy and a Quantum Cascade Laser
摘要：
二氧化碳中放射性碳（$^{14}$ C）的监测证明使用中红外光谱和量子级联激光。测量是基于光腔衰荡光谱，并以简单的设置实现了高灵敏度。该仪器使用含有高水平放射性碳的标准化样品进行测试。放射性二氧化碳可以从同位素比$^{14}$ C/C低至万亿分之50的样品中检测到，相当于纯CO $_2$中5 kBq/m $^3$的放射性，或从空气样品中提取CO $_2$后空气中2 Bq/m $^3$的放射性。该仪器简单、紧凑、坚固，是现场测量的理想工具。它的目的是监测核电环境中的放射性气体排放，在运行和退役的核电厂。它的高灵敏度也使其成为检测放射性废物储存库泄漏的理想工具。
英文摘要：
Monitoring of radiocarbon ($^{14}$C) in carbon dioxide is demonstrated using mid-infrared spectroscopy and a quantum cascade laser. The measurement is based on cavity ring-down spectroscopy, and a high sensitivity is achieved with a simple setup. The instrument was tested using a standardised sample containing elevated levels of radiocarbon. Radiocarbon dioxide could be detected from samples with an isotopic ratio $^{14}$C/C as low as 50 parts-per-trillion, corresponding to an activity of 5 kBq/m$^3$ in pure CO$_2$, or 2 Bq/m$^3$ in air after extraction of the CO$_2$ from an air sample. The instrument is simple, compact and robust, making it the ideal tool for on-site measurements. It is aimed for monitoring of radioactive gaseous emissions in nuclear power environment, during the operation and decommissioning of nuclear power plants. Its high sensitivity also makes it the ideal tool for the detection of leaks in radioactive waste repositories.
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