Radon Gas is a serious matter and it cannot be detected with a Geiger Counter or any standard radiation detection equipment. It requires a specialized device - a Radon Gas Detector.
We purchased one of these detectors for ourselves and put in in the room where we stored our Uranium ore samples. The device indicated over 100 pCi/L ! For reference, the average indoor reading is 2pCi/L... at a reading of 100 pCi/L, immediate evacuation is called for. You certainly don't need to have hundreds of pounds of Uranium ore in your house to have a dangerous Radon gas level. There are ordinary homes all throughout the U.S.A... in every state... that have deadly concentrations of Radon gas.

About Radon:
Radon is a colorless, tasteless, and odorless radioactive gas produced by the breakdown of uranium in the soil. When allowed to accumulate to high levels, it can be hazardous to long-term health.

The United Nuclear Series II Radon Gas Detector is the only radon gas detector on the market designed for use by the homeowner. It's very easy to use - simply plug it in to any outlet and you're done. The rest is automatic. The unit will then sample the air and display the Radon level in your home. If it is dangerously high, it will notify you with an alarm. The detector allows the homeowner to monitor Radon levels in their home over time by displaying short-term and long-term averages.

Click Here to view the EPA U.S. Radon map
and see if you live in a danger area.

Features:

• No wiring or batteries needed; uses standard 110v household current.
• Entela Certified
• Initial results will display in approx 48 hrs on a numeric digital LED display, thereafter display updated every hour.
• Shows the level of radon gas in pCi/L on a short-term or long-term basis
• 2 modes of measurement - long & short term
• Alarm sounds:
  • Long-term measurement reaches 4 pCi/L or greater (can be silenced)
  • Short-term measurement stays above 4 pCi/L for 30 consecutive days
• Samples air continuously; display updated every hour.
• Self-test every 24 hours with an error code displayed if failure.
• 10' power cord supplied
• Menu button controls 4 functions. Re-set unit and use in different locations.
• UL61010B-1:2003 Issued: 1/24/03 Ed: 1 Standard for Safety Electrical Measuring & Testing Equipment; Part 1: General requirements
• CSA C22.2 NO 1010.1-92 - Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use, Part 1: General requirements
• 10 year sensor and a 1 Year warranty.

Specifications:

• Power source input: 120 VAC / 60Hz at 6.5 Watts
• Power source output: 18 VDC / 200mA
• Sensor: Ionization Chamber
• Sensor voltage: 250 VDC
• Full scale reading: 0.1 to 999.9 pCi/L
• Operating temperature: 32 to 104 F (0 to 40 C)
• Storage temperature: -4 to 185 F (-20 to 85 C)
• Audible Alarm: 85dB at 10cm
• Beeps every hour if:
  • long-term readings are 4 pCi/L or greater or
  • short-term measurement stays above 4 for 30 consecutive days
• Averaging frequency: Levels will be updated on the display every hour
• Short-Term: Average over the past 7 days
• Long- Term: Average from the time of last reset (5 year max) resets after 5 years
• Accuracy: 12% pCi/L
• Dimensions: 4.7" x 3.1" x 2.1"

Since we do sell Uranium ore samples, it's important that we stress a point.
Collecting and storing a few Uranium ore samples is not going to create dangerous levels of Radon gas in your home. However, if you are and avid collector, and you have several pounds of Uranium ore in your home, you'd should consider buying one.

Radon Gas Detector: $179.00