Instrument Instance

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{
    "ob_id": 30174,
    "uuid": "bfa9cf69515f4e29bc45e5956c3a4e26",
    "title": "Australian Nuclear Science and Technology Organisations (ANSTO) 1500L low-level radon monitor",
    "abstract": "The Australian Nuclear Science and Technology Organisations (ANSTO) 1500L low-level radon monitor provides a unique technology for highly sensitive measurements of atmospheric radon (< 100 mBq m-3) and is recognised by the World Meteorological Organisation (WMO) as the best in the world for global and atmospheric compositional baseline studies.\r\n\r\nThe ANSTO dual-flow-loop two-filter works by removing all ambient radon (222Rn) and thoron (220Rn) progeny in the sampled air from the airstream using a filter before the air passes into a large delay volume to allow for the decay of the short-lived isotope 220Rn.\r\n\r\nThe sample air in the detector is passed through a flow loop at a flow rate designed to exchange the delay volume's air in approximately 20 minutes. This allows time for new radon progeny to form. A second flow loop circulates the volume of the delay chamber through the second filter (a low-impedance 625 mesh stainless steel screen) to collect all 218Po progeny. The newly formed progeny are collected on the second filter and their decays are counted with a ZnS-photomultiplier system. Using the flow rate and the count rate the atmospheric 222Rn concentrations can be calculated.\r\n\r\nThe instrument is operated at the Weybourne Atmospheric Observatory continuously.",
    "keywords": "",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/10700/?format=api"
    ],
    "instrumentType": "",
    "subInstrument": [],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/130384/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/130385/?format=api"
    ]
}