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" ... However, in laser cooling, researchers irradiate atoms with photons of an energy just below the amount required to make electrons jump from one state to another. If the atoms were stationary, no transitions would occur. However, if the atoms are moving, those atoms moving towards the light source will contribute some motion energy, so the combined motion energy of the atom and the energy of the photon is enough to make electrons jump between energy states. ... "
" ... Microwaves don't really affect the nutrient content of food in any different way than conventional cooking does, nor do they literally "nuke" or irradiate your food. It's perfectly safe to eat. ... "
" ... Nuclear reactors, which emit fast-moving particles that could potentially irradiate a human being, are surrounded by water for this exact purpose. They shield people from the particles the reactor emits, as these particles are slowed down by the water, emitting a harmless blue light instead. Energy is energy, and by taking it away from the particles themselves and converting it into light, it's a great way to ensure the safety of those nearby. ... "
" ... The RTG units on Voyager 1 & 2 use plutonium-238. This is an isotope of plutonium that undergoes decays only by producing alpha particles, which are absorbed within the RTG itself and so don't irradiate the other electronics in the spacecraft. As the plutonium decays with time, the amount of power it produces drops and the brick slowly cools. As the brick cools, the efficiency of the thermoelectric generator also drops. ... "
" ... The point about dirty bombs is that they either irradiate a small area, not a great problem, or if they cover vast acreages they raise radiation levels from, say, that of Devon to that of Cornwall. Sure, those of us on this, right, side of the Tamar look askance at them but it's not because of the radiation. ... "