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1. HARBIN - A cautious calmness prevails in four counties of Northeast China's Heilongjiang province, where the first traces of radioactive iodine were detected on Saturday.

2. Radiocarbon dating depends on measuring the radioactive isotope of carbon known as carbon 14, which is ingested during a lifetime and steadily decays after death.

3. The fast roads system is composed of three ring roads and 16 radioactive fast roads, which connect the 19 functional districts in the center city.

4. A TEPCO spokesman said the presence of radioactive chemicals such as iodine and cesium point to damaged fuel rods as the source.

5. Japanese officials insist that even at levels above government limits, radioactive cesium will not have an immediate effect on health.

6. The two most worrying radioactive isotopes from the power plant are iodine and cesium.

7. Overdoses of radioactive cesium in the body could cause slow and acute injuries, according to the China Atomic Energy Authority.

8. Wu chose to do this for an experiment that involved taking a sample of radioactive cobalt 60 and cooling to cryogenic temperatures with liquid gasses.

9. After spotting a news item in the newspaper about the former factory's radioactive legacy, she and her husband Christian joined a local group to demand government action.

10. Scientists and authorities in Singapore dismissed a text message circulating in the country warning about possible radioactive rain as a hoax.