A radon survey in Israel involving school children by means of the “RadonTest” online system Abstract.

The scientific rationale of this approach is provided in the article [6], in which the dependence of the coefficient of radon temporal variation on the test duration is given. [...] The measurement procedure consists of the three steps: (a) regeneration of the activated charcoal at the temperature about 150 oC and preparation of the samples (weighing and packaging the charcoal flacon into a package labeled by the QR-code), (b) passive exposure of the charcoal flacons from 3 to 6 days, (c) measurement of the activity of radon adsorbed by the charcoal, and calculation of the ra. [...] In the case of measuring low (zero) radon concentration, the uncertainty of the method can be significantly higher, but this does not affect the reliability of the comparison of the test result with the reference level. [...] The test results are displayed in the public Radon Map8 as markers in the form of circles with a diameter of about 120 m at the maximum scale of the map in order to maintain anonymity of the test participants. [...] How many tests are required? The results of the Monte Carlo simulation method in the case of a representative sample of buildings showed [1] that the AM uncertainty (assuming the absence of seasonal indoor radon variations): (i) does not exceed 10% or 5%, if the number of tests is at least 1000 or 5000, respectively, regardless of the nature of the lognormal distribution of indoor radon, (ii) does.