Assertion: gamma ray's source | /r/HasProperty | external
Facets:
Source sentences:
text: Risk from beta radiation is relative depending on the energy of the particle and whether the source is external or ingested.
text: as to which is most harmful, it depends very much whether the source is internal or external, and what is the mean energy of the radiation.
text: as to which is most harmful, it depends very much whether the source is internal or external, and what is the mean energy of the radiation.