Involving schoolchildren in radon surveys by means of the “RadonTest” online system

The involvement of the schoolchildren was enabled due to the active participation of the TCSS team from the Technion and the University of Haifa. [...] The measurement procedure consists of the five steps: (a) regeneration of the activated charcoal at the temperature about 150 °C, (b) preparation of the samples, which includes weighing and packaging the charcoal flacon into a package labeled by the QR-code, (c) passive exposure of the charcoal flacons from 3 to 6 days, (d) measurement of the activity of radon adsorbed by the charcoal, and (e) cal. [...] 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 6 6 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. [...] According to the regulation 10 principle9, the annual average indoor radon concentration will not exceed the reference level in the short-term test, if the following condition is met: C(t) [1+ KV (t)] CRL (1) where C(t) is the result of measuring the radon concentration during the test (Bq/m3), CRL is the reference level (Bq/m 3), KV (t) is the coefficient of temporal radon variation, or the tem.