The Intermediate Plus Nuclear Laboratory System, your comprehensive solution for advanced nuclear experimentation and analysis.

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The Intermediate Plus Nuclear Laboratory System, your comprehensive solution for advanced nuclear experimentation and analysis.

Unparalleled Versatility: This cutting-edge system is meticulously crafted to cater to the evolving needs of educational institutions, research facilities, and nuclear science enthusiasts. With its versatile design, it's perfectly suited for a wide range of applications, including teaching, advanced research, and radiation safety studies.

Precise Data Acquisition: Equipped with state-of-the-art technology, the Intermediate Plus Nuclear Laboratory System ensures precise data acquisition. It empowers users to conduct experiments with confidence, facilitating a deeper understanding of nuclear phenomena.

Seamless Integration: Our system seamlessly integrates with an array of detectors, amplifiers, and software, providing a comprehensive toolkit to explore and analyze radiation sources effectively. It's engineered for ease of use, making it accessible to both novice and experienced users.

Enhanced Features: The Intermediate Plus Nuclear Laboratory System boasts an array of enhanced features, including user-friendly software for data analysis, adaptable detector options, and flexible connectivity options, allowing you to tailor your experiments to your specific requirements.

Reliability and Support: Backed by Spectrum Techniques' commitment to quality and customer satisfaction, this system is built to last and comes with exceptional technical support to ensure your research and educational objectives are met with ease.

Unlock the potential of nuclear science with confidence, precision, and versatility using the Spectrum Techniques Intermediate Plus Nuclear Laboratory System. Elevate your experiments and research to new heights with this comprehensive solution.

System Components


The GP35, complete GM detector assembly includes our GM35, end-window, Geiger-Mueller detector, a 3 ft BNC cable, a 10 position sample stand, and sample tray.


The RAS 20 comes with 20 absorbers consisting of aluminum, plastic, and lead plates. The absorbers range from 4.5 to 7367 mg/cm2.


The RSS5 consists of 5 disk sources: 1 alpha emitter, 2 beta emitters, and 2 gamma emitters.

ST365 Specifications

Available in two different models

The ST365 Model A uses the original 6-decade LED screen, while ST365 Model B uses a 16 character, backlit LCD screen.

Capable of being operated via USB, Ethernet, and Wifi

While the ST365 can be used as a standalone unit, the user can also operate the ST365 via computer or Android app via USB, Ethernet, or WiFi connection.


When using with a computer or app, the ST365 is controlled using Spectrum Techniques’ new STU software.

Power 9 volt DC at 1200 mA*
High Voltage 0 to +1200 volts @ 0.2 mA, selectable in 10 volt increments
Inputs/Connectors – BNC Connector – accepts standard GM detectors
– MHV Connector – accepts scintillation detectors
Interface – USB 2.0
– LAN (for both PC and Mac)
– WiFi Direct for Android Device
Model A Display 6-decade LED – 1 inch numerals
Model B Display 16 character LCD – Backlight alpha numeric
Modes – Counts
– Count Rate (Counts Per Second)
– Elapsed Time
– Preset Time
– High Voltage Level
Software – Spectrum Techniques Ultra for PC
– Spectrum Techniques Ultra for Mac
– Spectrum Techniques Ultra for Android devices
Housing Plastic with metal front and rear panel
Dimensions 7.6 x 22.9 x 17.3 cm (3 x 9 x 6.8 in.) (H x W x D)
Weight 0.82 kg (1.8 lb)
  • ST365A or ST365B: ST365 Radiation Counter, Model A or Model B
  • USB: USB cable (6 ft.)
  • GP35: Complete detector assembly
  • RAS20: 20 piece radiation absorber set
  • RSS5 or RSS5EU: Set of 5 exempt quantity radioactive sources
  • LM5: Experiment lab manuals (CD version)


  • View PDF      ST365 Radiation Counter Operations Manual
  • View PDF      ST365 LAN Administration


READ BEFORE YOU DOWNLOAD: Click Download to copy the STU Software installation file to your computer. After a short delay the file will appear at the bottom of your browser window. Use your mouse cursor to double-click on the file. This starts the installation.

  • Download     PC – STU ST365 Software
  • View PDF      PC – Quick Start – Install STU ST365 Software
  • View PDF      PC – Quick Start – Run STU ST365 Software
  • View PDF      PC – STU ST365 Software User Manual


  • Download      Mac M1 computers – STU ST365 Software
  • View PDF       Mac M1 Computers – STU ST365 Software User Manual
  • Download      Mac – STU ST365 Software
  • Download      Mac – FTDI Drivers
  • View PDF       Mac – STU ST365 Software User Manual


  • Download     Android – STU Software
  • View PDF      Android – STU User Manual


  • View PDF     ST365 Webpage Control User Manual

NOTE: Adobe Reader is necessary to view these PDF documents.  If you do not already have Adobe Reader installed on your computer, you can download the installer for free from the Adobe website.