MS-700
Drone-Borne gamma-ray spectrometer
The Medusa Radiometrics MS-700 product line of radiation detection systems comprises a line of low-power, lightweight and robust gamma-ray sensors made "for walking" or for drone-borne applications! The systems are fully self-contained as they integrate data acquisition, processing and storage into a single embedded system. The systems can be read-out via a mobile device like a tablet or smartphone.
Description
Technology
The system comprises a 3x6 inch (700 ml) CsI-based scintillation detector connected to a tailor-made spectrum processing unit. This unit comprises a single PCB containing HV supply for the detector, 2048-channel MCA and a data processing/storage board. The board communicates via cable, or WiFi. Other crystal types (NaI, CeBr, BGO) are available on request.
The unit runs a dedicated webserver that provides access to the multiple functions of the device, i.e.
- Set-up of the system;
- Status view to inspect data and functioning of the system;
- Single and continuous measurement modes;
- Download view to allow retrieval of recorded data.
This webserver can be accessed via any standard webbrowser platform. A GPS and PTH sensor (pressure, temperature and humidity) are integrated into the sensor.
The data is stored in records containing geo-referenced stabilised gamma ray spectra, together with count rate and activities of 40K, 238U, 232Th and 137Cs. Other radionuclides can be added on request
System Operation - mDOS
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 32GB, yielding space for over 4000 hours of continuous logging of data. The system can be user-configured to output gammaray 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]
4.6
IPR
IP66
Power consumption
2.5W nominally, 6W peak
Temperature Range [°C]
-20 to +50
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Sensor Characteristics
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Crystal Type
Csl
Volume [ml]
700
Size [inch]
3x6
Resolution
<9% at 662 keV
PMT
PMT or SiPM
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.