DURRIDGE RAD7

Electronic radon detector with real-time monitoring and spectral analysis

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 one hour. At the end of each run, the detector prints out a complete report.

RAD7 Advantages

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 just 11 pounds (5 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.

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 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.

RAD7 Technical Specifications

Functionality:

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
Measurements		Radon in air with Sniff protocol for quick, spot reading Thoron protocol 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 H2O and Big Bottle RAD H2O 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
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 800ml/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
Audio Output		GEIGER Tone beeps for radon and thoron counts CHIME Chime only at the end of each cycle, otherwise silent OFF No sound
Tamper Resistance		TEST LOCK command locks keypad to secure against tampering

Technical Specifications:

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		0.01 - 20,000 pCi/L (0.4 - 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
CAPTURE Software		Compatible with Microsoft Windows XP and 7, and Mac OS X 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

Physical Specifications:

Dimensions		11.5" x 8.5" x 11" (29.5 cm x 21.5 cm x 27.9 cm)
Weight		9.6 pounds (4.35 kg)
LCD Display Output		2 line x 16 character, alpha-numeric display
Case Material		High density polyethylene
Infrared Printer		Chamjin NewHandy 700 Wireless Infrared Printer included
Power Supply		11-15V DC (12V nominal) @ 1.25A, center pin positive, or internal rechargeable batteries (5Ah) Optional AC input for non-EU customers
Battery Longevity		24 hours in SNIFF mode; 72 hours in Monitor mode

Documentation

RAD7 Manual (PDF)

RAD7 Specifications (PDF)

Featured Articles

The RAD7: How Technology Translates to Performance (HTML)

Application Note: Sniffing for Thoron (HTML)

Related Accessories

Purchasing

Price List (HTML)