Talk:Radiation zone

the time-constant
The value 171000 years (looks percisely) mentioned in this article is very different from 50000000 in, 20000000 in my book, >1000000 in. But in 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)