The present invention generally relates to a method for rapidly counting micron and/or submicron particles by passing such particles through any of a plurality of orifices simultaneously with an ion current and measuring the signal generated thereby. The present invention also generally relates to a device for practicing the method of the present invention. Some embodiments can include methods and/or devices for distinguishing between and counting particles in mixtures. Still other embodiments can include methods and/or devices for identifying and/or counting bioparticles and/or bioactive particles such as pollen.


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