Radon 222 is a major habitat pollutant. According to the INVS (now Santé Publique France): "... the annual number of lung cancer deaths attributable to domestic exposure to radon in mainland France would be between 1,200 and 2,900, or between 5% and 12 % of annual lung cancer deaths observed ".

The pollution of Radon 222 by domestic concentration is not to be neglected!

The Radon 222 audit allows you to assess the level of radioactive gas concentration in your home. It is recommended to carry out these measurements between September 15 and April 30 (N + 1). It is at this time of the year that the exhalation of radon is the most important and that the concentration of radon in the home (by reduced ventilation) is also the most important.

Two techniques can be carried out in the habitat to carry out in this evaluation and one technique in the field.

The punctual measurement (habitat):

This measurement is the fastest to perform. It is done using a data logger measuring device. The measurement is carried out in-situ for 90 hours, with one measurement recorded per hour. This rapid analysis makes it possible to highlight a concentration at an instant T. It is a "photograph" which gives an indication of the potential concentration level. [Device used for integrated measurement: Sun Nuclear 1027 from Sun Nuclear Corporation. this calibrated meter is classified as a Continuous Radon Monitor (CRM), a meter approved by the EPA (US Department of the Environment).

Integrated measure (habitat):

This measurement consists, using sensors, of an accumulation of nuclear traces (number of electric charges), linked to the decay of radon and / or its descendants, and a detailed analysis carried out at the end of the period. accumulation (reading of accumulation data by a laboratory). One month is the minimum time necessary for this accumulation period.

Field measurement:

In certain areas with a high radon risk, it is advisable to carry out radon-222 measurements on the ground, before construction, in order to assess the potential exhalation and thus allow construction to be considered based on the measurements obtained. This measurement consists of a sample in a confined atmosphere for a period of 4h30. This last measurement is carried out according to the AFFNOR NF M60-771 name.