MS-350
Drone-borne gamma-ray spectrometer
Medusa’s MS-350 “Ultralight Detector” is a low-power, lightweight and robust gamma-ray detector system especially suited for small-scale surveys by unmanned aerial vehicle (UAV). These systems are fully self-contained as they integrate data acquisition, processing and storage into a single embedded system. The MS-350 can also easily be used as a handheld system, operated from a smartphone or tablet PC. Used for mineral exploration and soil mapping.
Medusa Radiometrics
Groningen, NL
Description
Medusa’s MS-350 “Ultralight Detector” is a low-power, lightweight and robust gamma-ray detector system especially suited for small-scale surveys by unmanned aerial vehicle (UAV). These systems are fully self-contained as they integrate data acquisition, processing and storage into a single embedded system.
The MS-350 can also easily be used as a handheld system, operated from a smartphone or tablet PC.
Technical specifications
The system comprises a 3x3 inch (350 ml) CsI-based scintillation detectors connected to a tailor-made spectrum processing unit. This unit comprises a single PCB containing a 4096-channel MCA, a GPS board and a data processing/storage board. The board communicates via cable and WiFi.
The unit runs a dedicated webserver that provides access to the multiple functions of the device, i.e.
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Set-up of the system;
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Status view to inspect data and functioning of the system;
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Single and continuous measurement modes;
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Download view to allow retrieval of recorded data.
This webserver can be accessed via any standard webbrowser platform.
The data is stored in records containing energy-stabilized gamma ray spectra, together 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.
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 an embedded data storage having a maximum capacity of 4GB, yielding space for over 400 hours of continuous logging of data. The system can be user- configured to output gamma-ray spectra continuously, allowing to connect the sensor to multiple data acquisition systems.
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Specifications
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General
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Year of introduction
2017
Typical (geophysics) Application
Airborne, Landborne
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Embedded Processing
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Gain stablilsation
Software-based (natural peaks)
Spectrum analysis
FSA
Calibration
Monte-Carlo based
Output
Digitized waveforms, 2048 channel raw spectra, 300 channel 10 keV/chan spectra, 256 chan 12 keV/chan, Activity concentrations of 40-K, 232-Th, 238-U, 137-Cs (other nuclides on request)
Inspection
Webserver based realtime visualization of MCA data
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Environmental
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Housing
Carbon fiber; end caps: Anodized aluminum
System weight [Kg]
2.8
IPR
IP66
Temperature Range [°C]
-20 to +50
Power consumption
2.5W nominally, 6W peak
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Sensor Characteristics
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Crystal Type
Csl
Volume [ml]
350
Size [inch]
3x3
Resolution
<9% at 662 keV
PMT
ADIT 3.5 inch
Magnetically Shielded
Y
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Electronics
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ADC
14 bit, 250Mhz
Energy response [keV]
30 to 3000
Excess energies
Summed in last channel
Channels [raw]
2048
Pulse shaping
Digital
Deadtime
zero
Baseline restoration
Digital
Pile-up rejection
Present
Sample rate [Hz]
0-10
I/O
Ethernet, RS232
Internal storage [GB]
32
Timestamp
GPS-based, world time
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Other specifications
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Calibration
Calibrated using Monte Carlo simulated response curves (MCNP). Absolute calibration against any geometry.
Post-processing
Comes with full-spectrum analysis software. Airborne correction suite: Elevation correction, Cosmic correction and Radon correction.
