$1,095.00Add to order

The RAD H2O is an accessory for the RAD7 that enables you to measure radon in water over a concentration range of from less than 10 pCi/L to greater than 400,000 pCi/L. By diluting your sample, or by waiting for sample decay, you can extend the upper range to any concentration.

The equipment is portable and battery operated, and the measurement is fast. You can have an accurate reading of radon in water within an hour of taking the sample. The RAD H2O gives results after 30 minutes analysis with a sensitivity that matches or exceeds that of liquid scintillation methods. The method is simple and straightforward. There are no harmful chemicals to use. Once the procedure becomes familiar and well understood it will produce accurate results with minimal effort.

By taking two simultaneous samples, analyzing one immediately, waiting a week or more and then analyzing the other, the radium (226Ra) content of the water may be calculated.

Product Highlights
  • Portable: Complete kit provided in fitted case; weighs just 13 lbs.
  • Automatic: Procedure is controlled fully by the connected RAD7. Printouts provide data on radon concentration in water.
  • Fast: Analysis can be completed within one hour of taking the water sample.
  • Accurate: The RAD H2O provides results as accurate as liquid scintillation.
  • Sensitive: More sensitive than liquid scintillation. Lowest limit of detection is 10 pCi/L (20 minute count).
  • Clean and Safe: Involves no hazardous materials or chemicals.
  • Proven: Used by individuals and labs throughout the world for over ten years.
  • Great Value: Practically no running costs.

A vial containing a water sample is set up in a closed air loop with the RAD7. The RAD7 pump operates automatically for five minutes to aerate the sample, distributing the radon that was in the water throughout the loop. The RAD7 waits a further five minutes while the 218Po count rate approaches equilibrium and then counts for four five-minute cycles. The radon concentration in the water is calculated directly.

RAD H2O Physical Specifications
RAD H2O Shipping Dimensions 19″ x 16″ x 8″ (48 cm x 41 cm x 20 cm)
RAD H2O Shipping Weight 15 pounds (6.8 kg)
RAD H2O Components

The RAD H2O consists of a Case package, Aerator Cap Kit (x2), Indoor Faucet Adaptor, Drying & Charcoal Tube Kit, Glass Frit Kit, and RAD H2O Tubing Set. Components may also be purchased separately.

RAD H2O Case Package
RAD H2O Case Package
  • Rugged Pelican brand case with sculpted foam inserts
  • Drying Tubes
  • 250 ml glass vial with Septum Cap (x6)
  • 40 ml glass vial with Septum Cap (x12)
  • Labels for 40 ml glass vials
  • Small adjustable Retort Stand and Clamp
RAD H2O Aerator Cap Kit
RAD H2O Aerator Cap Kit
  • Aerator Cap (x2)
  • Tubing for 40ml and 250ml vials

$96.00Add to order

Drying And Charcoal Tube Kit
Drying And Charcoal Tube Kit
  • Small drying tubes (x4)
  • Tube of activated charcoal

$61.00Add to order

RAD H2O Glass Frit Kit
RAD H2O Glass Frit Kit

Three glass frits, 2 inlet filters, Tygon tubing spacers and labels for glass vials for RAD H2O with Nylon aerator

$220.00Add to order

Two glass frits and Teflon spacers for RAD H2O with Stainless steel aerator

$142.00Add to order

Indoor Faucet Adaptor
Indoor Faucet Adaptor
  • Plastic adaptor
  • 20-inch vinyl tubing

Read more

$25.00Add to order

RAD H2O Tubing Set
RAD H2O Tubing Set
  • From RAD7 to aerator cap, with check valve (~28″)
  • From aerator cap to drying tube (3″)
  • RAD H2O Bypass Assembly
  • Vacuum Grease Container

$66.00Add to order

DURRIDGE H2O 250ml Glass Vials (12 Pack
250ml Glass Vials (12 Pack)

Includes 12 250ml glass vials and caps for collecting RAD H2O water samples.

$53.00Add to order

DURRIDGE H2O 40ml Glass Vials (24 Pack)
40ml Glass Vials (24 Pack)

Includes 24 40ml glass vials, caps for collecting RAD H2O water samples, and labels for glass vials.

$53.00Add to order

DURRIDGE H2O Bypass Assembly
RAD H2O Bypass Assembly

Tubing and screw clamp for controlling airflow through the sampling vial to reduce foaming.

$37.00Add to order


RAD H2O connected to RAD7 (not included)

RAD H₂O case and contents

RAD H2O case and contents

RAD H2O configuration diagram

RAD7 H2O Configuration