Our instruments have several names:
radon counters, portable radon detectors, emanometers, sniffers, lucas cells, alpha scintillometers

click on links below for pictures

Portable Radon Detector

Water Degassing System

Lucas Cells

The Lucas-cell counting system like ours is (to our knowledge) the only method with sufficiant sensitivity for lake water surveys. Lucas cells provide the basis of EPA Method 903.1 for radium in water.

Lucas cells can determine thoron (radon-220) and hence radon/thoron ratios. In just a few minutes, our instrument counts 75% of the thoron atoms in the sample, hence giving us an accurate determination of the ratio.
One operator suggested using a gamma-ray spectrometer at the sample site to identify thoron. Given the short (55-second) half-life, it is impossible that enough thoron would migrate into the soil gas to give a gamma signal recognizably above background from gamma emitting daughters of thoron locked in mineral grains.
Several other radon systems have been marketed and used for uranium exploration. I have listed them below for the sake of completeness, but I'm not sure if any of them have the sensitivity for radon/thoron ratios or lake water surveys:
various alpha track (etched track or track etch) detectors using sensitized cellulose nitrate film or filmstrips, alphaNuclear, Electret (EIC), rad elec, e-perm, ionization chambers, granular activated charcoal or carbon filters (canisters), thermoluminescent dosimeters (TLD chips), alpha spectrometers. The electroscope was one of the earliest systems for detecting radon.

  • We measure: radon - radium - thoron - radon daughters - alpha radiation.
  • The Lucas cell is recognized as the most sensitive and reliable method for these elements.
  • Our instruments are used around the world in exploration for uranium, oil & gas, groundwater and hydrothermal, and in health physics, earthquake prediction, and evaluation of hydrocarbon and NAPL contamination.
  • In the radon business since 1968, our latest major instrument update was 2011.
  • Modern, low-power, field-rugged electronics. Some earlier versions still working after 35 years.
  • Winter and summer, from the Sahara Desert to the Canadian Shield, our instruments have faced up to severe field conditions.
  • Sensitive to geochemical trace levels necessary for radon in lake water and for radon-thoron isotope ratios.
  • Can work in a tent without electricity or be carried from point to point in the field.
  • 50 readings per day. Results available immediately.
  • Rechargeable battery pack good for a long day in the field and recharges in a few hours.
  • Can be operated by junior personnel if carefully supervised.
  • Same instruments used for radon and radium in soil, sediment, plant parts, rocks, water, soil gas, air, and snow, and for radon daughters in air.
  • Click here for pictures of instruments.
  • Click here for or other instruments, components and accessories we provide
  • For instruments contact
    R.H. Morse & Associates Ltd.
    skype: robert.morse.toronto
  • Multilingual consulting and training (if required).
Click here for or other instruments, components and accessories we provide Click here for more on radon in exploration
and for the 2013 radon discovery in the Athabasca

Copyright 1968 - 2015, R.H. Morse & Associates Ltd., all rights reserved.