Photoacoustic optical frequency comb spectroscopy of radioactive methane in the mid-infrared region

Juho Karhu, Teemu Tomberg, Francisco Senna Vieira, Guillaume Genoud, Vesa Hanninen, Markku Vainio, Markus Metsälä, Tuomas Hieta, Steven Bell, Lauri Halonen

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    Abstract

    The standard method for sensitive measurements of long-lived radioactive isotopes, such as 14C, is accelerator mass spectrometry (AMS). The AMS facilities are indispensable for applications like radiocarbon dating, but too expensive and massive for in-situ measurements. Laser spectroscopy, on the other hand, is a promising solution for isotope-selective detection of gas-phase compounds in applications that require low-cost instrumentation and on-site measurement capability. The recent work on laser spectroscopy of 14CO2 has led to impressive detection limits below the natural 14C abundance [1,2], which encourages us to develop similar techniques also for other radiocarbon compounds. Here, we report the first spectroscopic study of radioactive methane, 14CH4. Our work is motivated by a number of important applications, such as determining the biofraction of methane fuel mixtures and in-situ monitoring of radioactive gas emissions at decommissioning sites of light water nuclear reactors.

    Original languageEnglish
    Title of host publication2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
    PublisherIEEE Institute of Electrical and Electronic Engineers
    ISBN (Electronic)978-1-7281-0469-0
    ISBN (Print)978-1-7281-0470-6
    DOIs
    Publication statusPublished - Jun 2019
    MoE publication typeNot Eligible
    EventEuropean Conference on Lasers and Electro-Optics, CLEO Europe 2019 - Munich, Germany
    Duration: 23 Jun 201927 Jun 2019

    Conference

    ConferenceEuropean Conference on Lasers and Electro-Optics, CLEO Europe 2019
    Country/TerritoryGermany
    CityMunich
    Period23/06/1927/06/19

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