The AM31F used three separate measuring channels arranged in series within the same lead shield to perform the measurement. A common vacuum pumping system is used for transport of the sample gases through the system. Local RM1R display and control unity are included for system operation, data concentration and communication.
The particulate channel used a lead shielded fixed filter sampler providing collection of airborne on industry standard 47mm diameter filter paper. The filter paper deposition is designed to provide an even distribution and positions the active end of the detector in close proximity to the filter media for maximum sensitivity. The particulate channel will be equipped with a beta sensitive plastic scintillation detector (model SD201P) for detection of beta emitting particles. The detector inferfaces with a locally mounted spectrum analyzer (model SDA3E) which provides the low voltage power to the detector, interfaces the detector/SCA with the ratemeter, and provides an automatic gain control function.