Radiation Twisters are small, localized anomalies located in most apartment block biomes. Usually localized to trash cans behind the apartment, they are only navigable with hazmat suit and gas mask protection. They are easily avoided by not going near them when you hear a wind gust sound coupled with large doses of radiation. As with Orb Fields and Urchin Fields, Radiation Twisters tend to spawn in multiple points on the map at once.
It is unknown if artifacts spawn in radiation twisters.