N. Korea Nuke Test Nets No Radiation

    South Korean protesters burn an effigy of North Korean leader Kim Jong Un during an anti-North Korea rally denouncing the North's nuclear test  in Seoul, South Korea, Wednesday, Feb. 13, 2013. A day after North Korea defied U.N. warnings with a nuclear test, Pyongyang’s neighbors turned Wednesday to the business of bolstering their military preparations and sending out scientists to determine whether the detonation was as successful as the North claimed. (AP Photo/Ahn Young-joon)

    Protesters burn effigy of Kim Jong Un on Wednesday in Seoul. (Ahn Young-joon/AP)

    There have been no new radioactive isotopes released from North Korea’s underground nuclear test, South Korean experts said Thursday. Finding isotopes can help determine what type of nuclear device was used, but a well-contained test could yield no isotopes. North Korea claimed Tuesday to have carried out an underground nuclear test, and seismic activity trigged by the test has been detected by several nations. The United Nations Security Council has condemned the test, and Australia blocked a visit by North Korea diplomats over it.

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