Radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy

Mehr Fatima, Thomas Hausmaninger, Teemu Tomberg, Juho Karhu, Markku Vainio, Tuomas Hieta, Guillaume Genoud (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)


In this Letter, we report on the sub-parts-per-billion-level radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy. The 14C/C ratio of samples is measured by targeting a 14CO2 absorption line with minimal interference from other CO2 isotopes. Using a quantum cascade laser as a light source allows for a compact experimental setup. In addition, measurements of sample gases with 14CO2 concentrations as low as 100 parts-per-trillion (ppt) are presented. The Allan deviation demonstrates a noise equivalent concentration of 30 ppt at an averaging time of 9 min. The achieved sensitivity validates this method as a suitable alternative to more complex optical detection methods for radiocarbon dioxide detection used so far, and it can be envisioned for future in situ radiocarbon detection.

Original languageEnglish
Pages (from-to)2083-2086
Number of pages4
JournalOptics Letters
Issue number9
Publication statusPublished - 1 May 2021
MoE publication typeA1 Journal article-refereed


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