Intermediate Nuclear Laboratory System

Product Code: SN-7900A


PASCO’s most sophisticated stand-alone G-M System, providing a wide range of experiments with alpha, beta and gamma radiation. Includes a versatile scaler, a G-M Tube with a mount and trays, and a full set of radioactive sources and absorbers.

The Sources are USNRC License Exempt (US only).  Outside the US, consult local laws and regulations.


  • Preset Timing and Counting Intervals: (in seconds) 1-9, 10-90, 100-900, 1K-9K, 10K-90K, 100K- 900K. Intervals are selected using the Preset switch.
  • Digital Display: A bright 6-decade digital readout uses extra-large LEDs for clear readout in most ambient light conditions.
  • Built-in Power Supply: 0 to 1200 volts for the G-M Probe.
  • USB and serial interface to Mac and PC

What’s Included

Product Specifications

Po-210 0.1µCi,   138 days,    α
Sr-90 0.1µCi,   28.6 years,    β
Co-60 1 µCi,   5.27 years,    β, γ
Tl-204 0.25µCi,   3.78 years,    β, γ
Cs-137 0.25µCi,   30.2 years,    β, γ

Required Accessories

1x Isotope Generator Kit (Barium-137 m) SN-7995A

Radioactive Source Disclaimer

Local, national, and international regulations may restrict the purchase, storage, transport, use or disposal of radioactive sources. Please consult your local regulations to ensure your compliance before you purchase radioactive sources.

  • PASCO advertised sources are direct shipped to customers from Spectrum Techniques ( Please review their “Terms and Conditions” page before purchasing.
  • Once shipped, purchased sources are “Non-Cancellable” and “Non-Returnable”. Radioactive sources cannot be returned under any circumstances including “End of Life” disposal.
  • PASCO generally advertised sources are USNRC License Exempt (US only).
  • International exempt sources (per the International Atomic Energy Agency) are available for international customers or by request.