Ranac gives you the possibility to read the average value for 1 day, for 7 days, and accumulative for the last year. Being battery powered, the radon monitor can easily be moved around the building, in order to get the full overview of the radon in the home, the workplace, the school or in the kindergarten.
Compared to traditional technology, Ranac makes it much easier to locate the radon entry in the buildings. If the radon level is above the national action level, you can easily read the effect of simple mitigation measures, before you may have to consider more comprehensive mitigation actions by radon professionals.
NRPP APPROVED DEVICE:
$ 437.00 CAD
A Ranac can be compared to a digital version of a traditional alpha track detector. The detection of radon is based on the principle that radon gas diffuses into a detection chamber. When the radon atoms decay they emit energetic alpha particles. The alpha particles are detected by a silicon photo diode. Every alpha particle generates a small signal current when it hits the photo diode. By the use of a low-power amplifier stage the signal current is converted into a larger voltage signal. The maximum amplitude of the voltage signal is detected and sampled by an analog to digital converter (ADC). The amplitude is proportional to the energy of the alpha particle that hit the photo diode. The brain of the monitor is a micro-controller that registers the time and energy of every detected particle. This information is used to calculate the mean radon gas concentration for daily, weekly and yearly periods. This is all realized in electronic circuitry that in total only consumes a few micro-watts of power, making the Ranac able to operate for almost 3 years on a single set of small AAA alkaline batteries.
The calculation of radon gas concentration is complex since there are multiple error sources that have to be considered. When radon decays, several radioactive so-called daughters are produced - most notably Polonium-218 and Polonium-214, - which themselves emit alpha particles like radon does. These alpha particles could be mistaken for alpha particles from radon and give a false radon gas reading, but Ranac uses algorithms that are able to distinguish between the various alpha sources. The main input to these algorithms is the alpha particle energy in combination with the knowledge of the energy spectrum of radon and polonium isotopes. The Ranac has a very good energy measurement resolution, which is required when using such algorithms.
Overall Rating: 4 / 5
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