Talk:Radiation zone

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the time-constant[edit]

The value 171000 years (looks percisely) mentioned in this article is very different from 50000000 in [1], 20000000 in my book, >1000000 in [2]. But in [3] it is only 10000. The uncertainty is very large (about four orders). —Preceding unsigned comment added by 86.49.12.197 (talk) 06:46, 13 September 2009 (UTC)