nonradioactive       
adjective (also non-radioactive) uk/ˌnɒnˈreɪ.di.əʊˈæk.tɪv/ us/ˌnɑːnˈreɪ.di.oʊˈæk.tɪv/
 不具放射性的,无辐射性的
not having or producing the dangerous and powerful energy that comes from the breaking up of atoms
  They gave her an injection of a nonradioactive substance. 他们给她注射了一种非放射性物质。 
 Workers were evacuated following a leak of non-radioactive chemicals.
  - More examples
 - They were studying a nonradioactive isotope of helium.
 - The material eventually decays into a nonradioactive isotope of lead.
 - The research team developed a nonradioactive way of looking inside the body.
 - A leak of non-radioactive steam killed four workers from the power station.