Laser Ablation System With a Diode Laser for Ams 14 C Measurement of Organic Materials

We constructed a laser ablation (LA) system using a diode laser for the accelerator mass spectrometry radiocarbon (AMS 14 C) measurement of organic materials. The system could extract adequate CO 2 to analyze small masses (0.1 mg C) at a resolution of 250 μm by a 5.5 W diode laser. The LA system was assessed using standard materials (IAEA-C1, IAEA-C2, IAEA-C3, IAEA-C6, and Ox II) and applied to natural tree ring samples. For the LA sampling of organic samples, which generally results in incomplete combustion, tungsten (VI) oxide was used as an oxidant to achieve complete burning. The results of the measurement of standard materials showed a low 14 C background of F 14 C 0.0085 ± 0.0005 and reasonable reproduction of 14 C values. Finally, we applied this system to a single-year analysis of tree-ringed spruce timber in Alaska. It was observed to have a detectable background for the 14 C bomb peak

Ablation · Accelerator mass spectrometry · Carbon fibers · Chromatography · Diode · Laser · Laser ablation · Mass spectrometry · Metallurgy · Optics · Optoelectronics · Physics · Radiochemistry · Tungsten · Chemistry · Materials Science · Radioactive contamination and transfer · Environmental Chemistry

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