Radiation Detection
Detects beta radiation above 36 keV, and X-ray and gamma radiation above 7 keV.
Hands-on radiation detection
GCA-01C Analog Geiger Counters
Simple audio and visual indications of beta, gamma, and X-ray radiation.
The GCA-01C is a general-purpose radiation detection instrument. An audio click and LED blink indicate each detected event. Choose an internal GM tube or an external wand model.
Beta, gamma & X-rays
Audio & LED indicators
TTL pulse output
Choose your model
From $147.95
GCA-01C with internal GM tube: $147.95
GCA-01CW with external wand: $199.95
Designed for practical experiments
Detection, indicators & connections
Audio & Visual Signals
An audio click and LED blink indicate each detected radioactive event. A headphone jack is provided.
Digital Pulse Output
A 3.5 mm output port provides a TTL logic pulse for each detected event.
Compatible Digital Meter AdapterCompact Design
Approximate case dimensions: 3.5 × 5.75 × 1.25 inches. Includes an external power jack.
Geiger counter technical data
| Countable pulse resolution & range | 1 count per minute (CPM) to 5,000 counts per second (CPS) |
|---|---|
| Radiation resolution — Imperial | 0.05 mR/hr |
| Radiation range — Imperial | Background radiation* to 1,000 mR/hr |
| Radiation resolution — Metric | 0.0005 mSv/hr |
| Radiation range — Metric | Background radiation* to 10.0 mSv/hr |
| GM tube dimensions | Approximately 0.375 inch (⅜ inch) diameter × 4 inches long |
| Case dimensions | Approximately 3.5 × 5.75 × 1.25 inches |
* Background radiation at our location averages 18–22 µR/hr (0.18–0.22 µSv/hr). Your background radiation may differ with location and elevation.
The GCA-01C series is sensitive enough to detect background radiation, as well as NORM (Naturally Occurring Radioactive Materials) and TENORM (Technologically Enhanced Naturally Occurring Radioactive Materials) in your environment.
Configure your counter
Choose your model & accessories
Select the GCA-01C with an internal GM tube or the GCA-01CW with an external wand. Add an optional AC adapter or belt clip.
GCA-01C: $147.95
GCA-01CW: $199.95
Extend your setup
Geiger counter accessories
Explore our adapters and nuclear science accessories.
Digital Meter Adapter
Adds digital counting capabilities to your analog Geiger counter.
View DetailsGeiger Graph Software
Turn your Geiger counter setup into a radiation monitoring station.
View DetailsSpare External Wand
Explore external Geiger counter wands.
View DetailsNatural Uranium
Natural uranium radioactive source.
View DetailsRadioactive Sources
Cs-137, Co-60, Sr-90, and Po-210.
View DetailsAnalog Meter
Analog radiation meter information.
View DetailsLead Sheets
1 foot × 1 foot × 0.032 inch thick.
View DetailsUSB to Serial Adapter
USB adapter information and accessories.
View Details