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Radon Gaz Analiz Cihazı

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.

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 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.


  RAD7 Specifications



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

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. 
Optional serial to Bluetooth adaptor for wireless PC connectivity.

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



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

CAPTURE Software


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

Physical Specifications:

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


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