Radioactivity sounding is available for the Vaisala Radiosonde RS92 (400 MHz models) in addition to ozone measurement. The height and movement of air layers contaminated with radioactivity can be observed. The potential routes and fallout zones of airborne radioactive particles can be forecasted.

The NSS921 radioactivity sensor kit is needed for radioactivity sounding with the 400 MHz digital Vaisala Radiosonde RS92-SGP.