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Emission Chambers

Bulk and surface emission detection


DURRIDGE offers two categories of emission chambers: Bulk Emission Chambers, and Surface Emission Chambers. Used with the RAD7 radon monitor, these products make it possible to measure radon emissions from artifacts, and ground surfaces, respectively.

Bulk Emission Chambers

DURRIDGE's airtight Bulk Emission Chambers are perfect for storing samples of rock, soil, and more. Two quick-release ports make it easy to connect the Bulk Emission Chamber to the RAD7 in a closed loop for continuous measurement. The chamber's lid is attached with six thumbscrews, which can be easily loosened when the sample needs to be replaced.

The Bulk Emission Chamber is available in a 2.8L volume. A variety of other sizes are expected to be available soon.

Surface Emission Chambers

Two surface emission chamber accessories are offered for the RAD7 radon detector: the Soil Surface Emission Chamber, and the Hard Surface Emission Chamber. The Soil Surface Emission Chamber has a stainless steel skirt around its circumference to penetrate the ground. The Hard Surface Emission chamber has a flat base with sealant.

For soil emission measurements, the skirted chamber may be placed on the ground and stood upon, to push the steel skirt into the dirt. A closed loop measurement may be completed in approximately 30 minutes. Open loop monitoring may be performed continuously, showing diurnal variation of soil emission and allowing the user to obtain as high a precision as desired.

For hard surface emission measurements, the chamber without the metal skirt, and with a soft seal instead, may be applied to the surface. Closed and open loop measurements may be made.

The closed loop protocol provides a quick and sensitive reading, while the open loop protocol offers increased scope for investigating variations in emission due to changes in parameters such as barometric pressure, temperature, relative humidity, and ambient radon concentration.

Bulk Emission Chamber Physical Specifications

Interior Dimensions

11” x 7” x 2.5” (28 x 18 x 6.4 cm)

Interior Volume

2.8 L ± 0.05 L depending on configuration



Hose Connectors

Front Mounted

Shipping Dimensions

12" x 12" x 10" (30 cm x 30 cm x 25 cm)

Shipping Weight

6 pounds (2.7 kg)

Surface Emission Chamber Physical Specifications

Outer Dimensions

10” (25.4 cm) diameter by 1.25” (3.2 cm) deep

Inner Cavity Dimensions

8.5” (21.6 cm) diameter by 0.5” (1.27 cm) deep

Partition Dimensions

7.9” (20 cm) long by 0.5” (1.27 cm) wide.

Interior Cavity Volume

Approx. 26.4 cubic in (432.6 mL)



Hose Connectors

Top Mounted



Emission Chambers User's Manual (PDF)


Bulk Emission Chamber Setup Diagram (Standard Configuration)

Bulk Emission Chamber Setup Diagram (With DRYSTIK)


Price List (HTML)


Bulk Emission Chamber

Interior views of the Bulk Emission Chamber

Soil / Hard Surface Emission Chamber: top view

Bottom views of Soil Surface Surface Emission Chamber (L) and Hard Surface Emission Chamber (R)


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