Georadis Products


The world leading gamma-ray spectrometer for geological applications. A very highly sensitive unit providing Survey, Scan and natural nuclides Assaying. Equipped with BGO detector.


An Advanced Multipurpose Gamma-Ray Analyzer. The GT-40 can compute precise rock concentration of K (%), U (ppm) and Th (ppm). The GT-40 spectrometer is factory calibrated for precise measurements of Cs-137 and Cs-134 surface contamination. Equipped with an optional lead shielding, the GT-40 can also be used as a laboratory instrument.

SH 115/300

The SH115/300 is a small Gamma Ray shielding designed as a desktop accessory for Gamma Ray Spectrometers of series GT-40/GT-40S.



The GT-32 “Super-SPEC” Spectrometer is probably the most sensitive handheld geological spectrometer now available. It is a state-of-the art in portable hand-held radiation survey search devices for the geophysical industry. It offers an integrated design with a large detector, direct assay readout, data storage, full weather protection, ease of use and high sensitivity. GT-32 has a built-in 103 cm3 BGO detector with a 1024 channel spectrometer and 4 MB memory storage capability.

In comparison with its sister model GT-30, the GT-32 is 2 – 3 times more sensitive and time saves mone. 

In ASSAY mode it provides bedrock concentration analysis with direct data display of K (%), U and Th (ppm). The ASSAY time is selectable for optimum field analysis efficiency.

In SURVEY mode, the unit shows total count display on front panel in cps at 1/sec update rate. A loud linear audio signal permits eyes-free operation. A running histogram shows more than a minute of data samples. This instrument has Bluetooth wireless earphone support for noisy area surveying.



The new GT-40 series represents a major step forward in portable gamma-ray spectrometry for geological, geophysical and environmental surveying, prospecting and investigations. The compact unit with integrated GPS provides the user accurate and reliable results in real time.

The GT-40 with a 3” x 3” NaI(Tl) detector has high sensitivity and good resolution; it can be used for a variety of field applications.

The GT-40 S model with a 2” x 2” BGO detector and lead shielding should be used for focused measurement of cores or for stratigraphic measurements.

Using internal constants based on IAEA traceable calibration pads, the GT-40 can compute precise rock concentration of K (%), U and Th (ppm). Results are displayed immediately after end of measurements. They will be stored in the instrument and/or sent to appropriate external devices via Bluetooth or Wi-Fi.

A high sensitivity built-in GPS receiver can automatically record the geographical position and store it with each measurement. Measurements can be stamped with voice notes. Stored voice messages can be played back through the built in speaker. Survey data, including position, dose rate, total gamma and assay data can be collected point-by-point or automatically while walking or driving.

GT-40 and GT-40 S – versatile spectrometers for geophysical and environmental investigations

GT-40 S with lead shielding

SH 115/300

Laboratory unit,

accessory to the GT-40 and GT-40S

The purpose of the shielding is to minimize influence of local background radiation what increases sensitivity of gamma ray scintillometers or spectrometers. Real benefit is that low radioactive samples are measured in relatively short measuring times.

The main application for the shielding is laboratory gamma ray spectrometry. An average suppression of local background is minimum 1 to 10. Suitable for low activity determination in samples of various origins. Due easy assembly/disassembly the shielding is ready for mobile laboratories.