fàng​shè​xìng

radioactivity

放射性 fàng​shè​xìng
radioactivity noun
the property of certain elements to spontaneously emit radiation as their atomic nuclei decay; also used to describe things that are radioactive
radiating
in medicine, a symptom or pain that spreads or radiates outward from a single point

Frequency

Movie subtitles
4.05 per million appears in 1% of films
Written text
6.14 per million

Sources