MRN01 is dedicated for continuous measurement of 222Rn activity concentration in air and in soil air.
The radon mobile head is recording alpha particles from radioactive decay of 222Rn in measuring chamber. The radon enters a detection chamber by a process of diffusion through three cellulose filters which trap all the solid radionuclides. Alpha particles from the decay of radon and its progenies are detected by a light tight silicon detector with 400 mm2 of sensitive surface and with a depleted depth of 100 μm.
The energy window for alpha particles detection is set to between 1.5 MeV and 6 MeV. The detector totalises alpha emissions generated during pre-established time intervals from 1 to 240 min. Generated pulses are to be counted by data logger. The calibration of the sensor enables the volumic activity of the 222Rn to be calculated.