The DURRIDGE RAD7 is a truly versatile radon detector of mature and yet still state-of-the-art design. Its specifications 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, by radon testers, mitigators and home inspectors, in mines and deserts, on the ocean and up volcanoes, at extremes of temperature.
The RAD7 is also the simplest computer-driven electronic detector to use, with pre-programmed set-ups for common tasks. It's built to withstand everyday use in the field. A rugged, handsome case encloses the detector, which is self-contained and self-sufficient. The RAD7 comes complete, with a built-in air pump, rechargeable batteries, and a wireless infrared printer. The printer can be left in your office or your car, when desired, and the detector will collect data and store it for later printing or downloading to a PC.
The RAD7 is a Sniffer that uses the 3-minute alpha decay of a radon daughter, without interference from other radiations, and the instantaneous alpha decay of a thoron daughter. The RAD7 sniffs out entry points and radon gushers and recovers in minutes from high radon exposures. The RAD7 is also a Continuous Monitor that measures 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.
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 just one hour.
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 handsome rugged carrying case.
Microcomputer 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 infra-red data link for on-the-spot printouts.
Available with a wide range of accessories for measuring radon in water and below ground.
Versatile connectivity with an RS-232 port and USB compatibility adaptor
Includes CAPTURE software for data retrieval and analysis. Full Macintosh and Windows compatibility.
Includes rechargeable batteries and extensive documentation.
Modes of Operation
SNIFF Rapid response and rapid recovery radon measurement
THORON Radon and thoron measured simultaneously and independently
NORMAL High sensitivity
AUTO Automatic switch from SNIFF to NORMAL after three hours run
GRAB Analysis of grab samples
WAT Automatic analysis of water samples with RAD H2O accessory
Radon in air with Sniff protocol for quick, spot reading
Thoron in air for searching for radon entry points
Radon in air 1-day, 2-day or weeks protocol for long term measurement
Radon in water batch samples with RAD H 2O and Big Bottle System
Continuous radon in water with RAD AQUA and Radon-in-Water Probe
Radon in soil gas with Soil Gas Probe and Active DRYSTIK
Radon emission from soil and hard surfaces with surface emission chamber
Bulk radon emission from bulk materials and objects
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 800ml/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.
GEIGER Tone beeps for radon and thoron counts
CHIME Chime only at the end of each cycle, otherwise silent
OFF No sound
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
Compatible with Microsoft Windows XP and 7, and macOS
Automatic RAD7 location, connection and data download
Graphs radon, thoron, temperature and humidity over time
Automatic humidity correction
Statistical analysis tools track concentration averages and uncertainties
Chart Recorder mode provides real-time RAD7 status monitoring
Control RAD7 operations from computer via direct or remote connection
Automatic calculation and display of radon in water for RAD AQUA
Automatic combination of multiple RAD7 data
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