Instrument Instance

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{
    "ob_id": 43192,
    "uuid": "8918dfc45b3f43e7a1b0f8a81d80bda7",
    "title": "University of Bristol ANSTO radon A",
    "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. The 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. The 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. This analyser has been used at Ridge Hill atmospheric monitoring station.",
    "keywords": "",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/13189/?format=api"
    ],
    "instrumentType": "",
    "subInstrument": [],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/205441/?format=api"
    ]
}