A<unk>  is an element, often a radioisotope, that tends to accumulate in the<unk> s of humans and other animals when it is introduced into the body. An example is strontium-90, which behaves chemically like calcium and can replace the calcium in<unk> s. Other<unk> s include radium, samarium, and plutonium.<unk> -seeking elements are health risks but have uses in oncology.
Bone seeker
Fetor
Glare 
Whonamedit?
Body broker
Medgadget
Elscint
Hand surgery