Via Continuous Monitoring Equipment

Continuous Radon gas monitoring is an ideal means of determining Radon gas concentrations in any indoor environment.

Placement of a small microcomputer instrument can produce accurate data in as little as 12 hours, providing a measurement of working level (WL) of Radon daughters in the air.

These instruments are precision airborne alpha radiation detectors, based on pulsed ion chamber technology. Because of unique electrometer and probe design, these instruments do not use special counting gases, sample pumps, or high voltage power supplies.

As a consequence of the high sensitivity of these detectors, statistically significant data are obtainable in short periods of time. However, due to EPA protocol, average concentrations generated over 48 hour periods of time are recognized as being scientifically useful.

The units are designed to be operated unattended, while they continuously draw a sample of air from their environment and deposit airborne particles containing Radon daughters on a filter. Alpha particles emitted by the Radon daughters are measured by using a silicon detector.

The microcomputer records the number of alpha particles detected, stores the data for preprogramming sampling intervals, controls the flow of the sample and records decay measurements after the device has been turned off.

Collected data can then be displayed in picoCuries/liter of air by digital readout, or transferred into an intelligent peripheral printer for an actual hard copy record.

Together with prompt office processing of results, typical Radon gas testing can be accomplished, from start to finish, in two days.

The purpose of this information sheet is to highlight the effectiveness of continuous Radon gas monitoring surveys, which have proven to be an ideal means of producing accurate measurements when time-dependent information is required.

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