Real-time Continuous Radon Monitor with Spectral Analysis
The DURRIDGE RAD7 is a truly versatile radon and thoron detector used by research scientists and professionals worldwide. Its mature and yet still state-of-the-art design match or exceed those of the most expensive radon measurement devices in the world. At the same time, it incorporates a number of exclusive features that are found in no other radon detector, regardless of price. Incredibly, the RAD7 is affordable.
The RAD7 is a sophisticated measuring instrument widely used in laboratories and research work around the globe. It is used by professional radon testers, mitigators and home inspectors, as well as by research scientists studying groundwater, mines, deserts, the ocean and volcanoes at extreme temperature. A rugged carrying case encloses the instrument, ensuring reliability in the field.
The RAD7 is the easiest electronic radon detector to use, with preprogrammed setups for common tasks. The instrument comes complete with a built-in air pump, rechargeable batteries, and a detachable wireless printer. The RAD7 can store large amounts of radon data for later printing and/or for graphing and analysis on a computer using DURRIDGE’s powerful and free CAPTURE software.
The RAD7 is a Sniffer that detects the 3-minute alpha decay of a radon daughter, without interference from other radiations. It also detects the instantaneous alpha decay of a thoron daughter for rapid thoron measurements. The instrument can sniff for entry points and radon gushers, and it recovers from high radon exposures in minutes. The RAD7 is also a Continuous Radon Monitor which can measure the EPA action level of 4 pCi/L, with 10% standard deviation, in under two hours. At the end of each run, the detector prints out a complete report.
The included accessories are sufficient for the measurement of radon and thoron in air. Additional, optional accessories are available for the measurement of radon in soil gas and water, for the measurement of the emission of radon from surfaces, objects and bulk materials, and for other specialized applications. See the Products Overview page for details.
Precision and Performance
- Fastest response and recovery times of any electronic monitor/sniffer on the market.
- Measures EPA action level of 4 pCi/L in under two hours.
- Recovers from radon highs in minutes – not hours.
- Spectrum printout verifies correct operation of instrument in field.
Convenience and Ease of Use
- All-in-one complete, compact, portable unit in rugged carrying case.
- The instrument directs you step by step, so you can do what you want to do.
- Programmed set-ups for often-used tests.
- Audible radon and thoron counts lets you hear the hot spots.
Security and Flexibility
- Tamper-proof key-lock command secures your RAD7 and assures uninterrupted testing.
- Easily portable: The RAD7 weighs 9.6 pounds (4.35 kg).
- Displays, prints, and downloads radon data in your choice of units.
- Immunity to build-up of 210pb.
Expandability and Value
- Includes wireless printer and infrared data link for on-the-spot printouts.
- Available with a wide range of optional accessories for measuring radon in water and below ground.
- Versatile connectivity with an RS-232 port and USB adaptor
- Includes CAPTURE software for data retrieval and analysis. Full Windows and macOS compatibility.
- Includes rechargeable batteries and extensive documentation.
Operating the RAD7
The RAD7 is remarkably easy to use. When you turn it on you will see current settings listed on the LCD display. This allows you to check that the instrument is configured as needed for your intended use. Presets are available for 1-day and 2-day tests, and you can also establish a custom preset for your particular job. When you arrive at the testing site just select a preset and the RAD7 will start collecting data immediately.
An exclusive RAD7 feature is the ability to automatically switch between “Sniff” and “Normal” modes. The instrument starts in “Sniff” mode, providing a quick response, base-line reading. After 3 hours enough radon progeny will have accumulated on the detector for the RAD7 to be able to switch to “Normal” mode, providing higher statistical precision.
Once started, the RAD7 can be “locked” to prevent it from being tampered with until you return. When the RAD7 is locked it will become unresponsive to user input, but the radon test in progress will continue without interruption.
Alpha Energy Spectrum from RAD7
RAD7 Standard Setup Diagram
The RAD7 comes with all of these components and accessories.
RAD7 with optional bluetooth adaptor
RAD7 electronic radon detector
RAD7 SoftwareCAPTURE Software for Windows and macOS
Getting Started: 1-Day Test with the RAD7
Thoron Measurement Capabilities
Modes of Operation
1,000 records, each with 23 fields of data
Log of printer output also stored
Built-in pump draws sample from chosen sampling point
Flow rate typically 800 mL/min
Short, Medium, or Long format data printed after each cycle
Run summary printed at end of run, including averages and spectrum
RS232 serial port, full remote control implemented in CAPTURE Software.
Optional serial to Bluetooth adaptor for wireless PC connectivity.
TEST LOCK command locks keypad to secure against tampering
Principle of Operation
Electrostatic collection of alpha-emitters with spectral analysis
Passivated Ion-implanted Planar Silicon detector
SNIFF mode counts polonium-218 decays
NORMAL mode counts both polonium 218 and polonium 214 decays
Built-In Air Pump
Nominal 1 liter/minute flow rate
Inlet and outlet Luer connectors
RS-232 port up to 19,200 baud rate
USB adaptor is included with every RAD7
+/-5% absolute accuracy, 0% – 100% RH
SNIFF mode, 0.25 cpm/(pCi/L), 0.0067 cpm/(Bq/m3)
NORMAL mode, 0.5 cpm/(pCi/L), 0.013 cpm/(Bq/m3)
Radon Concentration Range
0.1 – 20,000 pCi/L (4 – 750,000 Bq/m3)
0.005 pCi/L (0.2 Bq/m3) or less, for the life of the instrument
Residual activity in Sniff mode drops by factor of 1,000 in 30 minutes
Temperature: 32° – 113°F (0° – 45° C)
Humidity: 0% – 100%, non-condensing
User controllable number of cycles, from 1 to 99 to unlimited, per run
User controllable cycle time, from 2 minutes to 24 hours
11.5″ x 8.5″ x 11″ (29.5 cm x 21.5 cm x 27.9 cm)
9.6 pounds (4.35 kg)
17″ x 17″ x 17″ (43 cm x 43 cm x 43 cm)
33 pounds (15 kg)
LCD Display Output
2 line x 16 character alpha-numeric display
High density polyethylene
Omniprint OM1000 Wireless Infrared Printer included
11-15V DC (12V nominal) @ 1.25A, center pin positive, or included internal EnerSys sealed lead acid rechargeable battery pack (6V nominal, 30Wh, 5Ah) See RAD7 Battery Material Safety Data Sheet (PDF)
24 hours in SNIFF mode; 72 hours in Monitor mode