Radon Map

The Radon Map does not contain personal data. The location of the points of indoor radon measurement is shown by intention with great uncertainty in order to maintain anonymity of the test participants. The test result based on the method of radon adsorption will not be shown on the Radon Map (and is not stored in database), if:

  • a) the user did not use the mobile phone to start the test,
  • b) the user did not use the mobile phone to stop the test,
  • c) the test duration exceeded 7 days,
  • d) the time interval between the completion of the test and the transfer of the sample to the laboratory exceeded 4 days,
  • e) an open flacon with activated charcoal fell during the test,
  • f) the user did not agree to the processing of personal data (such as nickname and email).

The measurement results are displayed in the Radon Map as markers, in the form of circles with a diameter of about 120 m at the maximum scale of the map. The colors of the markers correspond to the radon concentration scale, which is shown below the map. In addition, each marker contains the information about indoor radon concentration (the most probable value and uncertainty) for the test period, as well as the duration and date of the test start. In order to compare the measurement result with the reference level, it is necessary to follow the regulation principle , using the appropriate value of the coefficient of temporal variations of radon KV(t), which depends on the test duration.

According to the regulation principle, the annual average indoor radon (AAIR) concentration will not exceed the reference level in the short-term test if the condition is met

С . (1+ KV(t)) < CRL ,

where C is the result of measuring the radon concentration during the test, Bq/m3; CRL is the reference level equal to 200 (500) Bq/m3 for residential (industrial) buildings in Israel; KV(t) = 1.25, if the test duration is about 4 days, which corresponds to the duration of the CF-13 charcoal flacon exposure (the method of passive adsorption of radon). The values of the KV(t) coefficient depending on the test duration and measurement mode are given in (Tsapalov & Kovler, 2018) .

If this condition is not met, it is necessary to repeat the test with a measurement duration of at least 8 months or perform two tests at different seasons of the year for at least 2 months each (the interval between measurements should be 4-8 months) using suitable measurement methods.