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    Cesium-137 has a relatively long half-life (30 years), but it is also present in the ocean as a result of nuclear weapons testing in 1950s and 1960s.Cesium-134 is much shorter-lived, which means that any detected in seawater samples must have come from Fukushima.Because it was released in equal amounts with cesium-137, we can use its presence to determine how much contamination was released from the reactor site.» More about iodine-131 and cesium-137 How will the radioactive material released in Japan affect humans?This is in part because increases in cancer are hard to attribute to any single cause and it is difficult to detect small increases in cancer over time when 30 percent of us will get cancer of some form in our lifetimes.We should always be concerned, but we should also realize that different levels, time, and manner of exposure can have widely varying health risks.-Ken Buesseler, Woods Hole Oceanographic Institution What has been released from the Fukushima reactors and how dangerous is it?Releases from the Fukushima reactors have included dozens of radioactive elements, but with regard to materials released into the ocean, most of the attention has been on three radioactive isotopes released in large amounts: iodine-131, cesium-137, and cesium-134.

    But this "fingerprint" provided by cesium-134 is rapidly fading.Iodine-131 decays quickly and any that was released from Fukushima is no longer detectable in the environment, but it was a significant health concern at the start of accident.Cesium-137 and -134 were released in the largest amounts.This change is measured in half-lives—the length of time it takes for the radiation to decrease by one-half.Every radioactive substance has a different half-life, ranging from fractions of a second to billions of years.

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