Sensitivity of the elements of a nuclear environmental monitoring network

The AMS-02 aerosol measuring system is described. The system includes 2 static filters, for aerosol particles and for molecular iodine. Non-natural radioactivity is detected by alpha, beta, and/or gamma counting. If a warning/alarm signal is generated, a third sampling and measuring unit is engaged, separating iodine species that might escape the first two sampling devices. Activity of this unit is measured by gamma counting. The parts of the equipment, operation, data evaluation procedures, and sensitivity are described in detail. (P.A.)