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- Radioisotopes in corals can be used to date fossil corals and as ocean circulation tracers. ...up>14</sup>C, <sup>228</sup>Ra, <sup>210</sup>Pb) and those who have grown in since the time of accretion (e.g., <sup>230</sup>Th, <sup>231</sup>Pa) <ref3 KB (477 words) - 17:59, 6 September 2016