Unlike an X-ray, which creates a static picture, ultrasound does not emit potentially harmful radiation.
NUCLEAR power does not emit greenhouse gases, but the technology does have another rather nasty by-product: radioactive waste.
What is perhaps more disconcerting is that Taylor does not emit the formidable mental strength of old.
Thereafter it is powered by a turbofan engine that does not emit much heat, which makes infrared detection difficult.
Only nuclear power generation, which does not emit carbon dioxide, is available now as a large-scale alternative.
When an economy first gets going, it does not emit very much CO2, given that it has no factories or cars.
(Inconveniently, the most feared bomb component, uranium, is one of the hardest radioactive substances to detect because it does not emit a lot of radiation prior to fission).
Plutonium does not emit the type of penetrating radiation often associated with nuclear blasts, which causes immediately obvious health effects, such as burns.
Dark matter does not emit or absorb light or other forms of electromagnetic energy, but it accounts for some 27% of the total contents of the universe.
There is uncertainty about the amount of ionizing radiation from the central star that escapes from the nebula and the amount of hot low-density material that fills part of the volume but does not emit appreciable radiation.
Unless it is being compressed to explode, highly enriched uranium is a low-energy isotope that does not emit much radioactivity — it is "dull," in the lexicon employed by scientists in the field.
