Chlorophyll in plants is green which means that it absorbs light energy in other sectors than green and rejects the green. It uses this energy to manufacture constituents necessary for plant sustenance. There are other relatives of chlorophyll which absorb light at other points of the spectrum. Apparently plants have evolved in this star sector to most efficiently utilize the energy most available for their existence. But if it could be discovered that a variant of chlorophyll was sturdy enough to utilize the energy of gamma rays (which may be physically not very likely) then plants genetically altered to prosper under gamma radiation would be ideal radiation detectors as they would grow in the areas where gamma radiation existed as the result of atomic deposits, natural or artificial, thereby providing a visible signal that gamma radiation made the area dangerous.
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The stamen of the spiderwort plant turn pink when exposed to radiation.
That's interesting, but it would be useful if the plant would proliferate in radioactivity so that the mass of plants would indicate the intensity of the radioactivity.