RS-125 Spectrometer handheld radiation solutions
RS-125 Super-SPEC Handheld Gamma-Ray Spectrometer

– Ideal For Field Exploration-

Providing Search, Assay, and Scan Modes of Operation

The RS-125 Spectrometer is the industry standard in portable handheld gamma ray survey devices for geophysical applications. It offers an integrated design with a large detector for survey or search, direct Assay readout, a scan mode and data storage. It offers weather protection with ease of use. As well Bluetooth (BT) connectivity provides wireless connection to a Bluetooth enabled external GPS receiver, earphone or computer.

RS-125 Montage gamma ray detector screen and field work


  • High Sensitivity with Large NaI crystal 5 x 5 cm (2 x 2 in.)
  • Lightweight & rugged 2kg (4.4 lb) including batteries
  • Easy-to-use, single button operation
  • Survey, Scan, and Assay modes of operation
  • Assay mode readout in %K, ppm of U and Th
  • Auto-stabilizing on naturally occurring radio elements
  • 5-digit LCD display with scrolling histogram graph of last 100 readings
  • Fast audio output with adjustable audio threshold set point
    • BT earphone audio support for surveying in noisy environments
  • Bluetooth and USB equipped with external GPS integrated into data stream via BT
  • Special rugged design to withstand field usage, weatherproofing, water and dust protection
  • Typical 8-12 hour battery life at 20°C (4 x AA batteries)
  • No radioactive sources required for proper operation

RS-125 Handheld spectrometer field use

The RS-125 allows the user to produce profiles of the total count data from either the Search, Scan or Assay modes. The data can be from a continuous drill core or from a survey with GPS positioning data.

Survey Mode

The total count readout is typically set at 1x / sec rate, the range is variable from 1 – 20 sec. integration. When used with a GPS receiver, data can be stored and profiles produced. Ideal for both area and drill core scanning.

Assay Mode

The Assay mode provides the concentrations of K, U and Th. The user can select the desired sample time from 30 to 1800 seconds.

RS-125 Visual Interface

RS-Analyst Software

The RS-125 comes complete with utility software to download the data that is stored in the memory. All data in memory is output via Bluetooth or USB to the RS-Analyst program on a PC. This may take the form of 1024 channel spectra, data or scan data + GPS. The program also gives graphical and numeric views of the data. The data can also be re-exported as a text file for further processing.


  • Large NaI(Tl) crystal: 5 x 5 cm (2 x 2 in.)
  • 1024 Channel spectrometer
  • Energy Range 30 keV – 3000 keV
  • Assay and survey modes with automatic recording of data
  • On-the-fly Assay
  • Auto-stabilizing on naturally occurring radio elements
  • Single button control
  • Graphic LCD display 1 1/8” x 2 2/3” with white backlight and automatic dimming

• Survey mode: counts in CPS from 0 to 65,535 and Histogram chart
• Assay mode: display in %K, ppm of U & Th (ROIs per IAEA)

Audio via miniature speaker
• Variable audio threshold set point
• Audio proportional to count rate, internal sampling 20/second

• 4MB, memory can be partitioned for desired storage.
• More than 250,000 readings or 70 hours of readings.

Data Input / Output
• Via USB or Bluetooth (BT) (using supplied RS-Analyst software)

Temperature Range:  2-20°C to +50°C

RS-125 Size and Weight:
•  25.9 x 8.1 x 9.6 cm (10.2 x 3.2 x 3.8 in.)
• Removable protective boot with shoulder strap for additional protection and easy carrying
• 2 kg (4.4 lb) including batteries

Internal detachable battery pack:
• Typical Life 8+ hours at 20°C
• 4 x AA type rechargeable or alkaline

Standard RS-125 Package:
• RS-125 Spectrometer with carrying handle
• Removable protective boot with shoulder strap
• Battery cartridge with 4 x AA rechargeable     batteries & charger
• Spare battery holder cartridge
• RS-Analyst utility software
• USB cable
• User guide
• Delivered in hard case with foam insert


Radiation Solutions Logo Canada

Radiation Solutions Inc

Radiation Solutions Inc. (RSI) is specialized in nuclear instrumentation for the detection, measurement and analysis of low-level ionizing radiation from both naturally occurring and man made sources. RSI’s cutting edge radiation detection technology incorporates a fully digital system design, spectral analysis and advanced data processing. RSI deploys this technology in fixed installed, airborne and mobile systems, portable and handheld spectrometers providing a level of quality previously only attainable in laboratory equipment. RSI is committed to working as closely as possible with customers in all aspects of the product life cycle including product requirement, application, training, support and product enhancement. Our comprehensive approach results in hardware components and industry leading software techniques that produce outstanding results above expectations.



RS-125 Brochure

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