The NGM 216S monitor from the RAMSYS product line has been developed to continuously measure beta volumetric activity of radioactive gaseous sample. The sample is drawn from discharge stacks, reactor building, ventilation ducts or working areas via a pumping system. This monitor can operate as a stand alone device or in conjunction with a particulate monitor (PM 205™ or ABPM 201™ monitors), an iodine monitor (IM 201™ monitor) or a shielded particulate and iodine sampler (PIS 203™ sampler) and with a high range noble gas monitor (NGM 203™ monitor) to form a very wide range monitoring system.