Technical Data for the

GCA-07 and GCA-06 series

Radiation Detected
Alpha, Beta, X-Rays and Gamma.

Radiation Detector
Geiger-Muller Tube: Ne + Halogen filled with a .38" effective diameter 1.5-2.0 mg/cm2 mica end window.

Detector Sensitivity
. Alpha above 3.0 MeV
. Beta above 50 KeV
. Gamma above 7 KeV

Countable Pulse Resolution & Range 1 Count Per Minute (CPM) - 10000 Counts Per Second (CPS)

Radiation readout is switch selectable between Imperial and Metric measurements:

Radiation Resolution & Range (Imperial) 1.0 uR/hr - 1000 mR/hr | (Metric) 0.01 uSv/hr - 10.0 mSv/hr

The GCA-07 and GCA-06 series of Geiger counters detects background radiation as well as NORM (Naturally Occurring Radioactive Materials) and TENORM (Technologically Enhanced Naturally Occurring Radioactive Materials) objects in your environment.

Case Size:
GCA-07: approximate case size: 7.5" x 4.1" x 1.25"
GCA-06: approximate case size: 5.75" x 3.5" x 1.25"
External Wand approximate size (less cable) 0.85 diameter x 5.7" length


DETECTOR SENSITIVITY: Detects Alpha, Beta, X-Ray and Gamma Radiation. Alpha particles above 3 MeV in energy. Beta radiation above 50 KeV; X-Ray and Gamma radiation above 7 KeV.

COUNTING RANGE: 1 Count Per Minute (CPM) To 10,000 Counts Per Second (CPS).

RADIATION RANGE: 0.001 mR/hr resolution to 1000 mR/hr Range (Imperial Measurements); 0.01 uSv/hr resolution - 10 mSv/hr range (Metric Measurements).

NIST TRACEABLE CALIBRATION: Factory calibration using an NIST traceable radiation source to insure accurate radiation measurements.

Detector Features:

  • NRC Certification Icon

    NRC Certification

    NRC certification from a independent US gov't license testing laboratory *additional cost applies.
  • Radiation Warning Symbol

    Detects and Measures: Alpha, Beta, X-ray and Gamma Radiation

  • audio speaker output

    Audible Speaker Output

    Speaker output may be turned on and off.

    Headphone Jack

    For private listening.
  • simple interface

    Simple User Interface

    Intuitive front panel switches provides easy access to all Geiger counter functions.
  • Configurable Measurement Window

    Select Imperial or Metric Radiation Measurements
    Select Time Period; Counts Per Second (CPS) or Counts Per Minute (CPM).
  • Geiger Graphing Software

    Free Radiation Graphing Software

  • Geiger Counter easy to read LCD display

    High Contrast LCD Screen

    Provides easily readable measurments.
    Selectable backlight for low light conditions.

  • Low Battery Indicator

    Power 9V Battery

    Low Battery Indicator

    * Includes External Power Supply (AC wall adapter).

Leading in Value

  • Educational Institutions

    Educational Discount

    Schools and educational institutions get a 10% discount.
    Call 1-800-230-4535 for promo code
  • expert staff staff available to answer questions

    Expert Staff

    We can answer any questions you may have.

  • free online interactive tutorials

    Software Tutorials

    Online Radiation detection and monitoring interactive tutorials see more...
  • Best Value Geiger Counter

    Value Product

    Certifiable accurate radiation detection and measurement instrument.

Free Lite Geiger Graphing Software

30 Day Risk Free Money Back Guarantee!

If our Geiger counter doesn't meet your needs, let us know within 30 days and we will issue an RMA for a no hassle return. Returns must be in new and unused condition.