Measurement principles

The measurement of ²²²Rn is based on the interaction of ionizing radiation with matter. Measuring devices offered by are characterized by the following measuring principles:

1. ionization in a silicon semiconductor detector
2. scintillation in zinc sulfide ("Lucas cell")
3. generation of tracks in plastic material

All mentioned interactions are triggered by alpha radiation due to the radioactive decay of ²²²Rn (energy of the alpha particle energy: 5,49 MeV), ²¹⁸Po (6,00 MeV) and ²¹⁴Po (7,69 MeV). Only ²²²Rn is allowed to get into the measuring chamber and to the detector, radon decay products have to be retained by air filters or the casing itself. Inside the measuring chamber, ²²²Rn decays and the radon progeny contributes to the result of the measurement.

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