Leaders in professional radon instrumentation and analysis solutions    




DURRIDGE offers a variety of support options. Each is explained in detail below.


Product Manuals


All product manuals are in PDF format unless otherwise stated. PDF manuals may be viewed using Adobe Reader.

RAD7 Manuals

RAD7 User's Manual (English)  Updated October 1, 2017

RAD7 User's Manual (Spanish)   Updated June 25, 2014

Standard RAD7 Accessory Manuals
These products are included standard with the RAD7. 

USB to Serial Adapter Manual  (StarTech)

Printer Manual  (Applicable to Chamjin I&C and OmniPrint printer models)

RAD7 Accessory Manuals

Big Bottle System User's Manual (Aerator Cap Revision C) Updated February 26, 2016

Big Bottle System User's Manual (Aerator Cap Revision B) Updated February 26, 2016

Cool Trap Configuration with DRYSTIK  Updated March 30, 2016

DRYSTIK User's Manual  Updated October 29, 2016

Duty Cycle Controller User's Manual

Emission Chambers User's Manual  Updated September 28, 2016

Natural Rock Sample System User's Manual  Updated April 19, 2016

RAD AQUA User's Manual  Updated March 6, 2015

RAD H2O User's Manual (3D Printed Aerator Cap) Updated August 2, 2016

RAD H2O User's Manual (Stainless Steel Aerator) Updated January 28, 2016

Range Extender User's Manual

Soil Gas Probe User's Manual  Updated April 19, 2016

Water Switch User's Manual  Updated March 7, 2014

Third Party Accessory Manuals

CO2 Logger User's Manual  Updated November 24, 2014

RAD7 Bluetooth Connectivity Guide  Updated May 5, 2016

Software Documentation

CAPTURE User's Manual (HTML)   Updated September 18, 2017

CAPTURE User's Manual (PDF)  Updated February 6, 2017

Promotional Materials and Product Information

DURRIDGE Product Guide  Updated February 9, 2016


RAD7 Binder Insert  Updated July 27, 2016

Material Safety Data Sheets

Drierite Desiccant Material Safety Data Sheet

RAD7 Battery Material Safety Data Sheet


General Support:


Software Support:


For help using the RAD7 or any RAD7 accessory, please refer to our product manuals, or contact us at support@durridge.com

For hardware repairs and calibration, email service@durridge.com

For help with CAPTURE and other DURRIDGE software products, email software@durridge.com

For purchasing inquiries, please call the nearest DURRIDGE office (see phone numbers at the bottom of the page), or email sales@durridge.com


Video Tutorials

Instruction in the setup and use of the RAD7 and accessories


DURRIDGE has been busy preparing videos explaining how to set up and use the RAD7 radon monitor, the CAPTURE data acquisition and analysis software, and several related accessories.

Latest Videos

Getting Started: 1-Day Test with the RAD7
Learn how to set up a RAD7 and its accompanying accessories, in order to conduct a 1-day measurement of radon in air. 2014 YouTube video (9 min.)
Using CAPTURE 1: General Setup
Learn how to download RAD7 data to your computer for analysis in CAPTURE. 2014 YouTube video (10 min.)
Installing CAPTURE on the Mac
Learn how to install CAPTURE on a macOS computer. 2014 YouTube video (1 min.)

Using CAPTURE 2: Advanced Analysis
Learn how to use the advanced features of DURRIDGE's free CAPTURE software, including how to export your RAD7 data in various formats, how to combine two or more sets of data files, and more. 2014 YouTube video (10 min.)
Export CAPTURE Data Learn how to export radon data from the CAPTURE graph window. 2014 YouTube video (5 min.)
Combine RAD7 Data Files Learn how to combine radon data files to view them together in a CAPTURE graph window. 2014 YouTube video (2 min.)
Show RAD7 Data File Learn how to find the location of a RAD7 data file on your computer. 2014 YouTube video (1 min.)
Print a Graph Learn how to print a high resolution graph of your RAD7 data in CAPTURE. 2014 YouTube video (1 min.)
Update CAPTURE Learn how to update CAPTURE to the latest version. 2014 YouTube video (1 min.)
Using CAPTURE 3: The Chart Recorder Learn how to use CAPTURE’s Chart Recorder to monitor RAD7 radon tests on your computer in real time. 2014 YouTube video (5 min.)
Running Tests With Multiple RAD7s Learn how to use the Chart Recorder to view an averaged data set from multiple RAD7s. 2014 YouTube video (1 min.)

Older Videos

Getting Started: 1-Day Measurement 2012 YouTube video (9 min.)
What's In The Box? 2012 YouTube video (5 min.)



Research Papers


All research papers are in HTML format unless otherwise stated. PDF copies are available upon request and may be viewed using Adobe Reader.

Featured Articles

The following articles explore specific advantages of DURRIDGE products.

The Effect of CO2 on the Measurement of 220Rn and 222Rn (PDF)

This article explains that when a RAD7 is used in the presence of CO2, the thoron measurement is diminished more than the radon reading, and that therefore the 220Rn/222Rn ratio decreases as a function of CO2 concentration.
By Dr. Derek Lane-Smith and Ken Sims.
©2013 Institute of Geophysics, Polish Academy of Sciences.

Short Term Monitoring of Radon: Uncertainty Analysis (HTML)

An examination of the suitability of the RAD7 for short term radon tests.
By Dr. Derek Lane-Smith and Rory McLoughney. © 2012 DURRIDGE Co. Inc.

Product Comparison: Radon In Water Accessories (HTML)

This document compares the RAD H2O, Big Bottle System, RAD AQUA, and Water Probe.
By Dr. Derek Lane-Smith. © 2013 DURRIDGE Co. Inc.

Technical Note: Thoron Calibration (HTML)

When calibrating an instrument for thoron measurement, it is necessary to use a thoron sample of known strength and to account for its short half life.
By Dr. Derek Lane-Smith. © 2012 DURRIDGE Co. Inc.

Application Note: Sniffing for Thoron (HTML)

Sniffing for thoron with a RAD7 is the quickest way to locate a radon point of entry.
By Dr. Derek Lane-Smith. © 2011 DURRIDGE Co. Inc.

RAD7: How Technology Translates to Performance (HTML)

The RAD7's method of measuring radon allows it to be used repeatedly without requiring an excessive recovery time between separate measurements.
By Dr. Derek Lane-Smith. © 2011 DURRIDGE Co. Inc.

Soil Gas Measurement (HTML)

This article explains how a soil probe is used with a RAD7 to measure radon concentrations in soil gas while preventing the sample from being diluted by outside air.
By Dr. Derek Lane-Smith. © 2011 DURRIDGE Co. Inc.

Continuous Radon-222 Measurements in the Coastal Zone (PDF)

This article explains how better time resolution and higher sensitivities can be achieved with new radon measurement technologies.
By Dr. Derek Lane-Smith, William C. Burnett, and Henrieta Dulaiova. Sea Technology, October 2002, 37-45.

A Continuous Monitor for Assessment of Radon-222 in the Coastal Ocean (PDF)

This article explains how the RAD7 and an air-water exchanger can determine the radon activity in coastal ocean waters on a continuous basis.
By William C. Burnett, G. Kim, and Dr. Derek Lane-Smith. Journal of Radioanalytical and Nuclear Chemistry, 2001.

Published Research Involving DURRIDGE Products

Complete Articles

Dulai, Henrietta et al: Autonomous long-term gamma-spectrometric monitoring of submarine groundwater discharge trends in Hawaii. © 2016 Journal of Radioanalytical and Nuclear Chemistry. [View Article]

Carlo Lucchetti, Gabriele De Simone, Gianfranco Galli, and Paola Chanyotha: Evaluating radon loss from water during storage in standard PET, bio-based PET, and PLA bottles. © 2015 Radiation Measurements. [View Article]

Tuccimei, Paola et al: Our PET project: an unlimited supply of big and small water sample vials for the assay of radon in water. © 2015 Journal of Radioanalytical and Nuclear Chemistry. [View Article]

Lee, Kil Yong and Burnett, William: Determination of air-loop volume and radon partition coefficient for measuring radon in water sample. © 2013 Journal of Radioanalytical and Nuclear Chemistry. [View Article]

T Kluge, J Ilmberger, C Von Rohden and W Aeschbach-Hertig: Tracing and quantifying groundwater inflow into lakes using a simple method for radon-222 analysis: Hydrology and Earth System Sciences Discussions 11, 5 (2007) 1621-1631 [View Article]

Chi-Yu, Lin, Chih-Chieh, Su and Hsieh-Tang: Tracing Submarine hydrothermal Groundwater Discharge around Kueishantao off northeastern Taiwan using Radon. [View Article]

Article Abstracts

Supitcha Chanyotha, Chutima Kranrod, William C. Burnett, Derek Lane-Smith, and Jesse Simko: Prospecting for Groundwater Discharge in the Canals of Bangkok via Natural Radon and Thoron. © 2014 Journal of Hydrology. [View Abstract]

Hofmann, Harald, Gilfedder, Benjamin S., and Cartwright, Ian: A Novel Method Using a Silicone Diffusion Membrane for Continuous 222Rn Measurements for the Quantification of Groundwater Discharge to Streams and Rivers. © 2011 American Chemical Society. [View Abstract]

JO Lopez Plana: Ra isotopes and Rn as a tool for the water management resources: The Alberquillas aquifer (Málaga-Granada): Recercat, 2012. [View Abstract]

N Dimova, WC Burnett and D Lane-Smith: Improved automated analysis of radon (222Rn) and thoron (220Rn) in natural waters: Environ. Sci. Technol., 2009, 43 (22), pp 8599–8603 [View Abstract]

J de Weys, IR Santos and BD Eyre: Linking Groundwater Discharge to Severe Estuarine Acidification during a Flood in a Modified Wetland: Environ. Sci. Technol., 2011, 45 (8), pp 3310–3316 [View Abstract]

IR Santos, DT Maher and BD Eyre: Coupling Automated Radon and Carbon Dioxide Measurements in Coastal Waters: Environ. Sci. Technol., 2012, 46 (14), pp 7685–7691 [View Abstract]

KL Knee and TE Jordan: Spatial Distribution of Dissolved Radon in the Choptank River and Its Tributaries: Implications for Groundwater Discharge and Nitrate Inputs: Estuaries and Coasts, 2013 [View Abstract]

KC Tse and JJ Jiao: Estimation of submarine groundwater discharge in Plover Cove, Tolo Harbour, Hong Kong by 222Rn: Marine Chem., 2008, 111 (3-4), pp 160-170 [View Abstract]

V Rodellas, J Garcia-Orellana, E Garcia-Solsona, P Masqué, JA Domínguez, BJ Ballesteros, M Mejías, M Zarroca: Quantifying groundwater discharge from different sources into a Mediterranean wetland by using 222Rn and Ra isotopes: J. Hydrology, 2012, 466-467, pp 11-22 [View Abstract]

E Garcia-Solsona, J Garcia-Orellana, P Masqué, E Garcés, O Radakovitch, A Mayer, S Estradé and G Basterretxea: An assessment of karstic submarine groundwater and associated nutrient discharge to a Mediterranean coastal area (Balearic Islands, Spain) using radium isotopes: Biogeochemistry, 2010, 97, pp 211-229 [View Abstract]

AC Bianco, A Watanabe, K Nadaoka, S Motooka, EC Herrera and T Yamamoto: Estimation of nearshore groundwater discharge and its potential effects on a fringing coral reef: Marine Pollution Bull., 2011, 62, pp 770-785 [View Abstract]

HA Dugan, T Gleeson, SF Lamoureux and K Novakowski: Tracing groundwater discharge in a High Arctic lake using radon-222: Env. Earth Sci., 2012, 5, pp 1385-1392 [View Abstract]

N Dimova, WC Burnett, JP Chanton and JE Corbett: Application of radon-222 to investigate groundwater discharge into small shallow lakes: J. Hydrology, 2013, 486, 112-122 [View Abstract]

T Hosono, M Ono, WC Burnett, T Tokunaga, M Taniguchi, and T Akimichi: Spatial Distribution of Submarine Groundwater Discharge and Associated Nutrients within a Local Coastal Area: Environ. Sci. Technol., 2012, 46 (10), pp 5319–5326 [View Abstract]

KA Null, NT Dimova, KL Knee, BK Esser, PW Swarzenski, MJ Singleton, M Stacey, A Paytan: Submarine Groundwater Discharge-Derived Nutrient Loads to San Francisco Bay: Implications to Future Ecosystem Changes: Estuaries and Coasts, 2012, 35, pp 1299-1315 [View Abstract]

WC Burnett, RN Peterson, S Chanyotha, G Wattayakorn and B Ryan: Using high-resolution in situ radon measurements to determine groundwater discharge at a remote location: Tonle Sap Lake, Cambodia: J. Radioanal. & Nuc. Chem., 2013, 296, pp 97-103 [View Abstract]

PW Swarzenski, H Dulaiova, ML Dailer, CR Glenn, CG Smith and CD Storiazzi: A Geochemical and Geophysical Assessment of Coastal Groundwater Discharge at Select Sites in Maui and O'ahu, Hawaii: Groundwater in the Coastal Zones of Asia-Pacific, 2013, pp 27-46, Springer [View Abstract]

Research papers will be added as they become available. Please contact us if you have used DURRIDGE products to conduct research and would like to submit technical reports to our collection.


External Radon Links

We will be building this list over time. Suggestions for additional links may be submitted to radon@durridge.com.

U.S. Environmental Protection Agency Indoor Environments Division: Radon

National Radon Safety Board (NRSB)

National Environmental Health Association (NEHA)

American Association of Radon Scientists and Technologists

Idaho State University: Collected Radon Information

Radon article on Wikipedia, the free encyclopedia

Products Accessories Services Software Support More
RAD7 Radon Detector
Big Bottle System
Water Probe
Soil Gas Probes
Range Extender
Emission Chambers
CO2 Logger
Cool Trap
Duty Cycle Controller
Indoor Faucet Connector
Natural Rock Sample
Relay Box
Serial Bluetooth Adaptor
USB to Serial Adaptor
Water Switch
RAD7 Calibration
Thoron Calibration
RAD7 Repair
Firmware Upgrades
Software Drivers
Product Manuals
Support Contacts
Video Tutorials
Research Papers
External Radon Links
Company Information
Customer Testimonials
Contact Us