The T.S.A. says it had also bought 242 other body scan machines that use millimeter wave technology, which doesn't emit radiation but uses "harmless radio waves," according to its manufacturer, L-3 Security and Detection Systems.
The machines, in fact, do not emit radiation; they only measure it.
Will there ever be cell phones that don't emit radiation, or do they even emit any radiation?
And yttrium-90 does not emit gamma radiation, which greatly reduces the risk of radiation exposure to people working with the compound.
We call dark matter as such because this substance does not emit electromagnetic radiation (light, infrared, etc) nor interact with the normal matter that we see (stars, galaxies) in any way except through gravity.
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.
The effect of coincidence, rather than co-linearity, appears to be the key, and similar results were observed for 125I which does not emit annihilation radiation.
Unlike an X-ray, which creates a static picture, ultrasound does not emit potentially harmful radiation.
(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).
The device, which does not emit any type of radiation, searches for weapons by examining the "naturally-occurring waves produced by a person's body," according to the Metro statement.
