The PDS-100G and PDS-100GN are the new generation of gamma and gamma/neutron radiation detectors. These sensitive pocket-sized devices, from MGP Instruments, are designed to detect, locate and quantify any radioactive materials as special nuclear materials or radiological dispersal devices. The PDS-100G and GN have the ability to reject naturally occuring radiological material in order to limit any false alarms. They have been designed specially for first responders.