Beta-Absorption-Impactor Aerosol Mass Monitor

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Abstract
A sensitive real-time airborne dust mass monitor has been developed. Its operation is based on the measurement of beta-radiation absorption by aerosol particles collected onto a small area by means of inertial impaction. The device collects particles of unity density larger than 0.3 µm in diameter with nearly 100% efficiency at a flowrate of 20 liters/minute. A typical atmospheric mass concentration of 100 µg/m3 can be evaluated in less than one minute, using a one millicurie C14 source.

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