Correlation of the activity concentration of gas radon in environments located on ground floor and underground level

In Italy, workers' exposure to radon gas is regulated by the Legislative Decree n. 241/00 and concerns only underground workplaces such as caves, tunnels, catacombs and mines, establishing 500 Bq/m(3) as the limit value of activity concentration of radon. The Directive Euratom 59/2013 has introduced 300 Bq/m(3) as a reference level and the indication to carry out measurements in all public buildings located at the basement and ground level. The transposition by the member states scheduled for February 2018 has not yet taken place so in anticipation of the imminent transposition of the Directive by Italy, the goal of this preliminary work is to demonstrate the importance of monitoring the ground floor environments since they could have significant radon concentrations, though it is not subject to a legislative requirement. Usually the measures have a duration of 12 months, but for this preliminary approach, electrets detectors were used, in SLT configuration (Short chamber and Long Term electrets), for 30 days, in workplaces located on the ground floor and in the basement. Results show high values that can cause workers to exceed the radon maximum dose levels.