The ABS2218 (2" & 3") is a portable alpha-beta activity measurement system offering both simultaneous and separate measurement of alpha and beta activities in the sample. The system can be utilized in various applications including environmental analysis such as analysis of waste water after evaporation, detection of activities in small quantities of food samples and nuclear medicine such as in vitro tests. The ABS2218, produced in two versions namely 2" & 3”, is equipped with a Phoswich detector (ZnS(Ag)) 25mg/cm2 +0.25mm plastic scintillator (PVT)) which leads to impressively high spectrum resolution, high count rates and low measuring time. The holder considered for the sample is a sliding drawer capable of holding a planchet with maximum diameter 52mm and height 6.5mm in first version (2") and with maximum diameter 79mm and height 4.6mm in second version (3"). The sensitive touch screen display presents an intuitive user interface with simple and fast access to measuring procedures. Using modern digital signal processing algorithms, the USB base can accurately distinguish between the two types of radiation and accurately measure their energies. It is easy to operate and provides quick and reliable measurement results which are presented clearly arranged on the display. The system can accurately distinguish between alpha, beta and mixed pulses. The instrument is ideally suited for nuclide-specific activity measurements in the radionuclide laboratory. The measurement electronics is a modular designed system accommodated in a desktop housing. It includes a high voltage unit with preamplifier and an ADC for the acquisition of spectra. The measurement electronics ABS2218 is operated via PC software. This allows very intuitive user guidance. Pulse height spectra can be depicted graphically and evaluated. Several service functions are available including background measurement, energy calibration and spectrum recording.