Note: The following photos and diagrams show the Big Bottle System with Aerator Cap Revision C, which is coming soon. For information on the currently available Revision B, see the Revision B version of the product manual.

The Big Bottle System is an accessory for the RAD7 that enables users to measure radon in 2.5L water samples with high sensitivity. The lower limit of detection is well below 1 pCi/L (40 Bq/m3) radon concentration in water. The upper operating limit is 10,000 pCi/L (400,000 Bq/m3). For ranges higher than that, the standard RAD H2O accessory is recommended.

The Big Bottle System consists of several components, including the Tubing Set, Support Stand, Elastic Clinching Strap, USB Temperature Logger, Hermetically Sealed Thermocouple, and two 2.5 L Glass Bottles. The tubing set includes a check valve, aerating stones, and aerator cap. A RAD7 is required, as is either a Laboratory Dryer or DRYSTIK.

The complete system (excluding the optional DRYSTIK), is portable and battery operated, and the measurement is moderately fast. Even for the lowest radon concentrations you can have an accurate reading of radon in the water within two hours of taking the sample.

The Big Bottle System gives results after 120 minutes of analysis, or less, with a sensitivity that far exceeds that of liquid scintillation methods. The method is simple and straightforward, and there are no harmful chemicals to use. Once the procedure becomes familiar and well understood it will produce accurate results with minimal effort.

Soda Bottle Aerator Kit Accessory

For added convenience and versatility, the Big Bottle System can be used with standard soda bottles of any size from 500ml to 2L. This configuration requires the Soda Bottle Aerator Kit accessory, which features an aerator system similar to that used with the standard 2.5L glass jug.

Larger bottles allow for greater precision and lower limits of detection. With a 500ml bottle, it is possible to measure comfortably down to below 5 pCi/L (200 Bq/m3). With a 2L bottle it becomes possible to measure down to 1 pCi/L (37 Bq/m3).

CAPTURE Software Integration

DURRIDGE’s CAPTURE software makes it easy to download and analyze data recorded using the Big Bottle System. The program provides controls for identifying the specific experiment configuration, and it automatically calculates radon concentrations with respect to the the specified water temperature and volumes. The software is free to use and is available for download here.

Big Bottle System Physical Specifications
Glass Bottle System Shipping Dimensions 17″ x 17″ x 17″ (43 cm x 43 cm x 43 cm)
Glass Bottle System Shipping Weight 11 pounds (5.0 kg)
Soda Bottle System Shipping Dimensions 14″ x 14″ x 14″ (36 cm x 36 cm x 36 cm)
Soda Bottle System Shipping Weight 5 pounds (2.3 kg)
Retort Stand Shipping Dimensions 37″ x 8″ x 2″ (94 cm x 20 cm x 5 cm)
Retort Stand Shipping Weight 6 pounds (2.7 kg)
Big Bottle System Kits

Kits are available for two sample size ranges. Each kit contains the necessary individual components, listed below, plus the appropriate coupler-cap.

DURRIDGE Glass Bottle System
Glass Bottle System

Includes Glass Jug Aerator Kit, (2) 2.5L glass jugs, Retort Stand Kit with Clamp, Tubing Set, and Temperature Logger Kit with Temperature Probe and Bottle Strap.

$617.00Add to order

DURRIDGE Soda Bottle System
Soda Bottle System

Includes Soda Bottle Aerator Kit, Retort Stand Kit with Clamp, Tubing Set, and Temperature Logger Kit with Temperature probe and Bottle Strap. Compatible with most 500ml-2L pressurized PET soda bottles.

$587.00Add to order

Individual Components

The individual components are also available to purchase separately:

Soda Bottle Aerator Kit
Soda Bottle Aerator Kit

$97.00Add to order

Glass Jug Aerator Kit
Glass Jug Aerator Kit

$89.00Add to order

Retort Stand Kit
Retort Stand Kit

Includes Retort Stand & Clamp and Tubing Set

$186.00Add to order

Retort Stand & Clamp
Retort Stand & Clamp

$92.00Add to order

Big Bottle System Tubing Set (revision C)
Big Bottle System Tubing Set

(Revision C, coming soon)

Big Bottle System Tubing Set (revision B)
Big Bottle System Tubing Set

(Revison B, available now)

$115.00Add to order

Laboratory Drying Unit
Laboratory Drying Unit

$86.00Add to order

2.5L Glass Jug
2.5L Glass Jug

With Teflon lined cap

$20.00Add to order

Temperature Logger Kit
Temperature Logger Kit

With Temperature probe and Bottle Strap

$250.00Add to order

Glass Jug Shoulder Bag

See PDF for details

$32.00Add to order

  • DURRIDGE Big Bottle System
    Big Bottle System with Aerator and Temperature Data Logger
  • DURRIDGE Soda Bottle Aerator Kit for the Big Bottle System
    DURRIDGE Soda Bottle Aerator Kit for the Big Bottle System

DURRIDGE Big Bottle System Glass Jug Aerator Cap Revisions A, B, and C

DURRIDGE Big Bottle System Soda Bottle Aerator Cap Revisions A, B, and C

The Aerator Cap has undergone revisions to improve ease of use and reduce the risk of water entering the desiccant.


Big Bottle Aeration

    Big Bottle System Configuration PhotoBig Bottle System Configuration Photo

    Big Bottle System Configuration Diagram
    Big Bottle System Configuration Diagram


    Big Bottle System Manual (Aerator Cap Revision C, PDF)
    Big Bottle System Manual (Aerator Cap Revision B, PDF)