nonionising BrE
nonionizing AmE

Display of a nonionizing radiation warning sign meets standard.

It has not been shown conclusively that microwaves (or other nonionizing electromagnetic radiation) have significant adverse biological effects at low levels.

Randall Barbour, PhD - developed methods and instrumentation for imaging human tissue by optical tomography, a nonionizing diagnostic tool (2000s).

He said there were two types of radiation, high-energy ionizing radiation like X-rays, which can alter genes, and low-energy nonionizing radiation used in heating like microwave ovens.