• Excellent service

    Sensor broke? We fly to any place in the world to fix it!

Service and expertise

We support your business by our state of the art gammaspectrometer solutions, excellent service and extensive support.

Detector Calibration

We want you to have the best information from your gamma-ray spectrometers. Proper calibration of gamma-ray survey systems is key to a successful survey yielding quantitative results.

Our sensors are delivered with a calibration from our calibration facility. In this facility we can re-calibrate your acquired Medusa Sensing tool but we also calibrate borehole logging sensors and airborne sensors of other suppliers.

Calibration file for GAMMAN or 3rd party

After calibration, we deliver a full report on the quality of the tool and its calibration factors. The calibration file can be used in our GAMMAN data analysis package or in third party software that uses our GAMMAbase module.

Our WIKI contains more technical info and whitepapers on the subject.

Please contact us for pricing of our calibration service and for an example calibration document.

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Calibration service
Detector Design

Detector design

We believe that type and size of a gamma-ray sensor should be fitted to your needs and not the other way around. Every sensing project has unique needs, and we help you get the best out of your set-up by finding the optimum radiation sensor for your project or platform.

In practice this means we closely collaborate with our clients to find the sensor design optimised for their platform.

Our sensor-design toolbox

We apply tools and techniques originally developed for nuclear research to get to the best possible sensor design given boundary conditions set by your project and measuring platform. For drone-borne sensing, often sensor weight is the most important issue whereas for underwater mapping sensor robustness is key. Using computer modelling of sensor response we can choose the right sensor type and size for any application.

We design and deliver, from drones to seaborne vessels.

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Data Analysis

Sometimes radiometric datasets need an objective review. We provide analysis and assessment of datasets, using our full spectrum analysis methods and Monte Carlo modelling of detector response. Examples of such assessments include evaluation of borehole datasets to correct for effects like borehole casing and diameter variations. Another example is found in a review of airborne data to assess the contribution of radon without using data from an upward looking detector.

Over the years, we have seen many applications of gamma-ray spectrometers and processed data for mining, sediment research, agricultural applications, environmental studies and road construction mapping. Our knowledge on these applications can help you to improve and extend the use of your gamma ray spectrometers.

The publications on our Wiki  demonstrate the broad use of our gamma ray sensors.

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Data Analysis
Measuring radionuclides on samples.

Analysis of samples

The gamma-ray spectrometers of Medusa are calibrated such that they produce activities in Bq/kg dry matter (or in ppm dry matter, these values can easily be converted). This gives the opportunity to use lab measurements to set-up an application model, (e.g. to correlate the radionuclide concentrations to clay or other soil properties) to translate the field values into a map of the soil property under investigation.

The concentrations of 238U, 40K, 232Th and 137Cs from the samples are measured on a 3×3 inch NaI gamma spectrometer placed in a laboratory setup. In this setup, the gamma-ray spectrometer is placed in a lead shielding (the blue drum in the figure) to reduce the amount background radiation coming from the surrounding environment.

More information on sample preparation can be found on our Wiki .

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KVI

Scientific Support and Expertise

The team members of Medusa are authorities in the field of radiation measurements and applying sensor systems for mapping. It is not only our past experience of several decades we rely on. In many of our projects we collaborate with universities and students. Our close collaboration with the Center for Advanced Radiation Technology of the university of Groningen ensures that we keep up with the latest developments from the scientific world.