Analog Geiger Counters are useful for detecting radioactivity and performing nuclear experiments. The models GCK-01 and GCK-02 are offered as kits as well as assembled. The assembled and tested geiger counters have the "A" suffix. These Geiger Counters primary indicators are an audio click and an LED blink each time a radioactive particle is detected. Count Rate VS Dose Rate chart on front of counter provides an indication of radiation based on clicks per second.

The Model GCK-02 has an internal Geiger-Mueller tube. The model GCK-01 has an external wand that houses Geiger-Mueller tube (GMT-01) and provides a easy to use probe for checking radioactivity. The GM Tube is a Ne + Halogen filled, with a .38” effective diameter 1.5-2.0 mg/cm2 mica end window.

• Detects alpha above 3.0 MeV.
• Detects beta above 50 KeV.
• Detects gamma above 7 KeV.

The CGK-01 and GCK-02 Geiger Counters have the following features:

Headphone / Analog Meter Jack
Digital Output -- Provides a TTL logic pulse each time a radioactive particle is detected. Used to connected to various digital adapters:

Digital Meter Adapter -- Turns our analog into a accurate digital geiger counter

RS-232 PC Adapter (with free Windows Radiation Monitoring Software)

Random Number Generator - Generate real random numbers for experiments.

External Power Jack

Geiger Counter Kit GCK-01 & CGK-02 includes:

• Printed Circuit Board (PCB-06)
• Printed and drilled enclosure case
• Assembled Wand (* GCK-01 ONLY)
• GM Tube (* GCK-02 ONLY)
• All electronic components

Case Size 5.6" x 3.2" x 1.5" .PDF Drawing (50K)

Analog Geiger Counters are useful for detecting radioactivity and performing nuclear experiments. The models GCK-05 and GCK-06 are ready to build kits. These Geiger Counters primary indicators are an audio click and an LED blink each time a radioactive particle is detected.

The Model GCK-06 has an analog meter. The Geiger-Mueller tube (GMT-01), included in the kit, is a Ne + Halogen filled, with a .38” effective diameter 1.5-2.0 mg/cm2 mica end window.

The Geiger Counter kits GCK-05 and GCK-06 detects the following radiation.

• Detects alpha above 3.0 MeV.
• Detects beta above 50 KeV.
• Detects gamma above 7 KeV.

The CGK-05 and GCK-06 Geiger Counters have the following features:

Headphone / Analog Meter Jack
Digital Output -- Provides a TTL logic pulse each time a radioactive particle is detected. Used to connected to various digital adapters:

Digital Meter Adapter -- Turns our analog into a accurate digital geiger counter

RS-232 PC Adapter (with free Windows Radiation Monitoring Software)

Random Number Generator - Generate real random numbers for experiments.

External Power Jack

Geiger Counter Kit GCK-01 & CGK-02 includes:

• Printed Circuit Board
• GM Tube
• All electronic components

Case Size 5.6" x 3.2" x 1.5" .PDF Drawing (50K)

This Digital Meter Adapter plugs into the digital out of the analog geiger counters and display a Count Per Second (CPS) or a Count Per Minute (CPM) and the equivalent radiation level. CPS or CPM mode is user selectable. Radiation level is provided in mR/hr or mSv/hr in CPS mode (user selectable). In CPM mode radiation level is provided in uR/hr or uSv/hr (user selectable). The adapter is compatible with analog meter geiger counters that use either an internal tube or a wand with shielded cable.

Countable Pulse Resolution & Range         1 Count Per Minute (CPM) - 9,360 Counts Per Second (CPS)
Radiation Resolution & Range                   1.0 uR/hr - 655 mR/hr
          (Metric)                                       .01 uSv/hr - 6.5 mSv/hr

LCD Display 16 character by 2 line LCD (liquid crystal display) with back light provides easy to read output.

May be Purchased as a kit or assembled and tested

Digital Meter Adapter Construction Article

This Digital Adapter plugs into the digital out of the analog geiger counters and provides an RS-232 computer output for use with Images Company Geiger Counter Graphing program.
Click here to see screen image from program.

The Windows Geiger Counter program is free to download;

Download Digital Geiger Counter charting software for Windows XP (3 MB).
Download Digital Geiger Counter charting software for Windows 98 (3 MB).
Software Manual(PDF file 1.9 meg)
On Line Interactive Software Tutorials

The adapter is compatible with analog meter geiger counters that use either an internal tube or a wand with shielded cable.

May be Purchased as a kit or assembled and tested

This adapter plugs into the digital out of the analog geiger counters and provides a random each time a radioactive particle is detected. The geiger counter is set up to read background radiation. The random numbers generated are truly random since they are based naturally occurring radioactivity.

The random number generate may be set to the following ranges:

Binary (1-2) Heads or Tails
Decimal (1-10)
1 Byte (1 - 255)
2 Byte ( 1 -65535)

The random number generator is compatible with analog meter geiger counters that use either an internal tube or a wand with shielded cable.

Typically, depending upon location, the generator will generate 20-40 random numbers per minute. TTL Serial Output Random numbers are sent out via a TTL serial port that may be interfaced to a micro controller or PC.

LCD Display 16 character by 2 line LCD (liquid crystal display) with back light provides easy to read output.

May be Purchased as a kit or assembled and tested

The Radiation Meter may be incorporated into a standard analog geiger counter to provide a visual readout of the approximate radiation level.

Click here to see schematic.

Complete unit plugs into the headphone jack using a 3.5mm plug. Compatible with the GCK-01 and GCK-02 geiger counters.

Analog Radiation Meter is available alone, as kit, or assembled and tested.