The Medusa Radiometrics MS-2000 product line of radiation detection systems comprises a line of low-power, lightweight and robust gamma-ray sensors developed with vehicle-borne mapping applications in mind. The ultra-rugged housing is made of kevlar-strengthened carbon fibre and has extra rugged end-caps. The system can be mounted on all kinds of vehicles, tractors, quads or cars. The MS-2000 is operated from a smartphone or tablet PC using the Medusa Detector Operation System (mDOS)


The system comprises a 90x310 mm (2000 ml) CsI-based scintillation detectors connected to a tailor-made spectrum processing unit. This unit contains a 4096-channel MCA, an RTK-ready GPS, real-time data processing and embedded storage. The system works as a stand-alone unit, and the data can be viewed by connecting to the interface using WiFi or ethernet on a cabled connection. 

The unit runs the  Medusa Detector Operation System (mDOS) that provides access to the multiple functions of the device:

  • Set-up of the system;

  • Status view to inspect data and functioning of the system;

  • Single and continuous measurement modes;

  • View the data in real-time plotted on a map;

  • Download data for custom post-processing.

The data is stored in records containing energy-stabilized gamma-ray spectra, with count rate and activities of 40K, 238U, 232Th and 137Cs. Other radionuclides can be added on request. The data is geo-referenced using the built-in GPS.

System Operation

The system is designed for minimum operator interaction. It provides various views on the data streams while being acquired, allowing for online system checks. The system has embedded data storage with a standard capacity of 16GB, yielding space for over 700 hours of continuous data logging. The system can be user-configured to output gamma-ray spectra continuously, connecting the sensor to multiple data acquisition systems.

The system can be integrated into modern DAS systems, like the Geoduster DAS. This way, spectrometer data can continuously be logged and combined with other sensors like GPS and elevation meters.


Key Parameters

Radiation sensor

System Data

  • High sensitivity

  • Lightweight and rugged carbon housing

  • CsI scintillator for enhanced stability

  • Full spectrum recording

  • Automatic gain stabilization

  • Online nuclide-specific count rates

  • On-board data logging

  • Set up, control and viewing of data via a built-in web server running mDOS

  • CsI crystal, other crystal types on request

  • A dedicated Spectrum Processing Unit comprising

    • 4096 channel MCA,

    • Spectrum stabilization

    • HV supply

    • Nuclide-specific data

  • Housing: Carbon fibre; end caps: Anodized aluminium

  • Connectors: one 8-pin LEMO Artic grip M-series

  • Environmental: 
    -40 0C to +85 0C; 
    IP68 protected

  • Power input 5-35V, (3W nominally, 6W max)

  • Data acquisition rate: up to 1Hz

  • Data storage capacity: 16GB internal

  • Wireless connection via WIFI and Bluetooth

  • Battery-powered

  • Connectivity: user-configurable output streams over IP or serial link

  • Optional: external MASS logging software