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※ 本文轉寄自 angelplume.bbs@ptt.cc

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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級的燃煤火力發電廠

每年會排出5.2公噸(不受控制)的鈾(其中34公斤是鈾235)
以及每年12.8公噸的釷

1000MW級的核能發電廠

每年產生500磅(=226公斤)的鈽以及30短噸(1 短噸= 0.9072公噸)的受控高放射廢棄物

根據估計，美國在1982年因燃煤而釋放到大氣中的未受控放射物
是三哩島事件的155倍

NOTE:燃煤電廠的等效劑量是核能電廠的100倍

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以下開放住在火力電廠旁邊

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◆ From: 140.113.242.120
※ 編輯: jerry78424      來自: 140.113.242.120      (03/22 14:54)


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