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.
The RAD7 comes complete with all of these components and accessories:
- RADLINK Remote Control Software
- Wireless Infrared Printer, Battery Charger, rechargeable batteries & 6 rolls paper
- External 12V Power Adaptor
- 2 sets Velcro Tabs
- 4 Drying Tubes
- Gas Drying Unit
- 5 lb Indicating Desiccant
- 1 Dust Filter & 6 Inlet Filters
- Vinyl Tubing
- USB to Serial adapter cable
- CAPTURE data acquisition and analysis software
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 specialised 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 handsome 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.
RAD7 electronic radon detector
RAD7 with optional bluetooth adaptor
The RAD7 comes with all of these components and accessories.
Operating the RAD7
The RAD7 is remarkably easy to use. It’s ready to operate from the moment you turn it on. The first thing you will see is the Setup Review, which displays the current settings. This allows you to check that your machine is set up the way you want it for your intended use.
Now you and your RAD7 are ready to go to work. The machine is preset for a 1- or 2-day test… or you can choose a preset for your particular job that day. When you arrive on site, just push the buttons and the test runs automatically.
A RAD7 exclusive feature is “Auto” mode. This starts a test in Sniff mode for quick response, a base-line reading. After 3 hours it automatically switches to “Normal” mode for the remainder of the test, assuring statistical precision.
You can leave your RAD7 for a 24-hour, 48-hour or any-hour test, knowing that the measurements will be correct, thanks to the “Test Lock” command, which locks the machine until you return. The display shows “DURRIDGE RAD7”, the test continues, and no amount of tampering – intentional or unintentional – can influence it.
USB and Bluetooth Connectivity
Stored RAD7 data may be downloaded to a computer using a USB or serial connection. DURRIDGE offers a dedicated RAD7 communications software package called CAPTURE, which automatically transfers RAD7 data to disk, displays radon graphs, and produces a variety of supplementary information. CAPTURE can also monitor a RAD7 in real time with its Chart Recorder. Learn more about CAPTURE here.
For situations where the RAD7 can not be directly connected to a computer, DURRIDGE offers the Parani SD1000 Serial to Bluetooth Adaptor. This adaptor offers a 100 meter wireless range, and it comes pre-configured for plug and play compatibility with the RAD7 and CAPTURE. An optional 16 hour battery allows the adaptor to be used even in the absence of a reliable power source.
|Modes of Operation||
|Data Storage||1,000 records, each with 23 fields of data
Log of printer output also stored
|Sample Pumping||Built-in pump draws sample from chosen sampling point
Flow rate typically 800 mL/min
|Print Output||Short, Medium, or Long format data printed after each cycle
Run summary printed at end of run, including averages and spectrum
|PC Connectivity||RS232 serial port, full remote control implemented in CAPTURE Software.
Optional serial to Bluetooth adaptor for wireless PC connectivity.
|Tamper Resistance||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
|Connectivity||RS-232 port up to 19,200 baud rate
USB adaptor is included with every RAD7
|Measurement Accuracy||+/-5% absolute accuracy, 0% – 100% RH|
|Nominal Sensitivity||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)|
|Intrinsic Background||0.005 pCi/L (0.2 Bq/m3) or less, for the life of the instrument|
|Recovery Time||Residual activity in Sniff mode drops by factor of 1,000 in 30 minutes|
|Operating Ranges||Temperature: 32° – 113°F (0° – 45° C)
Humidity: 0% – 100%, non-condensing
|Cycle Range||User controllable number of cycles, from 1 to 99 to unlimited, per run
User controllable cycle time, from 2 minutes to 24 hours
|RAD7 Dimensions||11.5″ x 8.5″ x 11″ (29.5 cm x 21.5 cm x 27.9 cm)|
|RAD7 Weight||9.6 pounds (4.35 kg)|
|Shipping Dimensions||17″ x 17″ x 17″ (43 cm x 43 cm x 43 cm)|
|Shipping Weight||33 pounds (15 kg)|
|LCD Display Output||2 line x 16 character alpha-numeric display|
|Case Material||High density polyethylene|
|Infrared Printer||Omniprint OM1000 Wireless Infrared Printer included|
|Power Supply||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)|
|Battery Longevity||24 hours in SNIFF mode; 72 hours in Monitor mode|
Expendable RAD7 Supplies
5 lb Indicating Desiccant
25 lb Indicating Desiccant (8 mesh)
25 lb Indicating Desiccant (10-20 mesh)
RAD7 Printer Paper Rolls (x6)
Additional RAD7 Supplies
Wireless Infrared Printer
Laboratory Drying Unit
Small Drying Tubes (x4)
Inlet Filter Pack (x6)
Dust Filter (x1)
RAD7 Tubing Set