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Statements

Subject Item
dbr:Beta_attenuation_monitoring
rdf:type
yago:WikicatMeasuringInstruments yago:Object100002684 yago:Artifact100021939 yago:Instrumentality103575240 yago:Whole100003553 yago:Detector103180969 yago:PhysicalEntity100001930 yago:MeasuringInstrument103733925 yago:Instrument103574816 yago:WikicatDetectors yago:Device103183080
rdfs:label
Beta attenuation monitoring Radiometrische Staubmessung
rdfs:comment
Beta attenuation monitoring (BAM) is a widely used air monitoring technique employing the absorption of beta radiation by solid particles extracted from air flow. This technique allows for the detection of PM10 and PM2.5, which are monitored by most air pollution regulatory agencies. The main principle is based on a kind of Bouguer (Lambert–Beer) law: the amount by which the flow of beta radiation (electrons) is attenuated by a solid matter is exponentially dependent on its mass and not on any other feature (such as density, chemical composition or some optical or electrical properties) of this matter. So, the air is drawn from outside of the detector through an "infinite" (cycling) ribbon made from some filtering material so that the particles are collected on it. There are two sources of Die radiometrische Staubmessung ist ein Verfahren zur Bestimmung von Schwebstaub und Staubemissionen. Für dieses Verfahren ist der Einsatz eines Betastrahlers notwendig. In der Literatur findet sich für Schwebstaub-Messgeräte, die nach dem Prinzip der radiometrischen Staubmessung arbeiten, die Bezeichnung β-Staubmeter oder Beta-Staubmeter.
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dbc:Aerosols dbc:Air_pollution dbc:Meteorological_instrumentation_and_equipment dbc:Measuring_instruments dbc:Detectors dbc:Radioactivity
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dbpedia-de:Radiometrische_Staubmessung n11:fR1Q freebase:m.0zrsyc7 wikidata:Q17005411 yago-res:Beta_attenuation_monitoring
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Die radiometrische Staubmessung ist ein Verfahren zur Bestimmung von Schwebstaub und Staubemissionen. Für dieses Verfahren ist der Einsatz eines Betastrahlers notwendig. In der Literatur findet sich für Schwebstaub-Messgeräte, die nach dem Prinzip der radiometrischen Staubmessung arbeiten, die Bezeichnung β-Staubmeter oder Beta-Staubmeter. Beta attenuation monitoring (BAM) is a widely used air monitoring technique employing the absorption of beta radiation by solid particles extracted from air flow. This technique allows for the detection of PM10 and PM2.5, which are monitored by most air pollution regulatory agencies. The main principle is based on a kind of Bouguer (Lambert–Beer) law: the amount by which the flow of beta radiation (electrons) is attenuated by a solid matter is exponentially dependent on its mass and not on any other feature (such as density, chemical composition or some optical or electrical properties) of this matter. So, the air is drawn from outside of the detector through an "infinite" (cycling) ribbon made from some filtering material so that the particles are collected on it. There are two sources of beta radiation placed one before and one after the region where air flow passes through the ribbon leaving particles on it; and there are also two detectors on the opposite side of the ribbon, facing the detectors. The sources' intensity and detectors' sensitivity being the same (or corrected with appropriate calibration lookup table), the intensity of beta rays detected by one of detectors is compared to that of the other. Thus one can deduce how much mass has the ribbon acquired upon being exposed to air flow; knowing the drain velocity, actual particle mass concentration in air could be assessed. The radiation source can be a gas chamber, filled with 86Kr gas, or a pieces of 14C-rich polymer plastic, such as PMMA. Detector is simply a Geiger–Mueller counter. The particulate matter content measured is affected by the moisture content in the air, unfortunately. To discriminate between particle of different sizes (e. g., between PM10 and PM2.5), some preliminary separation could be accomplished, for example, by cyclone battery. A similar method exists, where instead of beta particle flow an X-ray Fluorescence Spectroscopic monitoring is applied on the either side of air flow contact with the ribbon. This allows to obtain not only cumulative measurement of particle mass, but also to detect their average chemical composition (technique works for potassium and elements heavier than it).
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