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http://disp.cc/b/72.SN-1qkE §@ªÌ jerry78424 («CªQºÑÀÜ) ¼ÐÃD Re: [·s»D] ¤õ¤Oµo¹q«Ü¦w¥þ¡H¡@·Ñ¦Ç¿ç®g¶W¹L®Ö¼o®Æ ¡K ®É¶¡ Tue Mar 22 14:43:42 2011 http://en.wikipedia.org/wiki/Fossil_fuel_power_station Radioactive trace elements As most ores in the Earth's crust, coal also contains low levels of uranium, thorium, and other naturally occurring radioactive isotopes whose release into the environment leads to radioactive contamination. While these substances are present as very small trace impurities, enough coal is burned that significant amounts of these substances are released. A 1,000 MW coal-burning power plant could have an uncontrolled release of as much as 5.2 metric tons per year of uranium (containing 74 pounds (34 kg) of uranium-235) and 12.8 metric tons per year of thorium.[17] In comparison, a 1,000 MW nuclear plant will generate about 500 pounds of plutonium and 30 short tons of high-level radioactive controlled waste.[18] It is estimated that during 1982, US coal burning released 155 times as much uncontrolled radioactivity into the atmosphere as the Three Mile Island incident.[19] The collective radioactivity resulting from all coal burning worldwide between 1937 and 2040 is estimated to be 2,700,000 curies or 0.101 EBq).[17] It should also be noted that during normal operation, the effective dose equivalent from coal plants is 100 times that from nuclear plants.[17] 1000MW¯Åªº¿U·Ñ¤õ¤Oµo¹q¼t ¨C¦~·|±Æ¥X5.2¤½¾·(¤£¨ü±±¨î)ªº¹\(¨ä¤¤34¤½¤ç¬O¹\235) ¥H¤Î¨C¦~12.8¤½¾·ªºØA 1000MW¯Åªº®Ö¯àµo¹q¼t ¨C¦~²£¥Í500½S(=226¤½¤ç)ªº¹Z¥H¤Î30µu¾·(1 µu¾·= 0.9072¤½¾·)ªº¨ü±±°ª©ñ®g¼o±óª« ®Ú¾Ú¦ôp¡A¬ü°ê¦b1982¦~¦]¿U·Ñ¦ÓÄÀ©ñ¨ì¤j®ð¤¤ªº¥¼¨ü±±©ñ®gª« ¬O¤Tù®q¨Æ¥óªº155¿ NOTE:¿U·Ñ¹q¼tªºµ¥®Ä¾¯¶q¬O®Ö¯à¹q¼tªº100¿ -- ¥H¤U¶}©ñ¦í¦b¤õ¤O¹q¼t®ÇÃä ¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡×¡× ¸Ó©Èªº¤£©È¡A¿ç®g¦Ã¬V¡H§A¤£ª¾¹D§A¨C¤Ñ³£¦b§l¶Ü¡H ![]() |
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