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ray |
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rayAny of several orders (especially Ragiformes) of cartilaginous fishes with a flattened body, winglike pectoral fins, and a whiplike tail. Species include the stingray, for example the Southern stingray Dasyatis americana, which has a serrated, poisonous spine on the tail, and the torpedo fish. Ray
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Immediately after the procedure, researchers randomly assigned patients to receive one of four different doses of radioactive yttrium-90 -- which emits beta rays -- within their arteries. The peptide is designed to adhere to somatostatin receptors that are overexpressed by several types of cancer, while the Re-188 isotope "warhead" emits a beta ray that destroys tumor cells. The ocean contains a certain amount of radioactive potassium, which emits beta rays that produce Cherenkov light of their own. |
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