A network of three radon stations has been established in the Langadas basin, North Greece. Newly made devices with plastic tubes are in operation with a-particle track detectors (ATDs) in registering a-particles from radon and radon decay products exhaled from the ground, every two weeks, starting from December 1996, by using LR-115, type II, nonstrippable Kodak films. Simultaneous measurements are made by using Lucas a-scintillation cells for
instantaneous measurements of radon in soil gas, before and after setting the ATDs at the radon stations. The new devices used have the advantage of not using heating systems nor electrical power in the nearby area of the stations. Radon flux registrations ranged between 507 and 85880 tr cm22 or 1.5 and 188.9 tr cm22 h21, in the period of measurement, while radon concentrations in soil gas ranged between 528 and 35095 Bq m23 at the same time
