ionizing radiation

/AY1 AH0 N AY0 Z IH0 NG R EY0 D IY0 EY0 SH AH0 N/
noun
  1. 1

    High-energy radiation that is capable of causing ionization in substances through which it passes; also includes high-energy particles.

Source: https://en.wiktionary.org/wiki/ionizing%20radiation