Selenium steady-state 3 yr PDF

Here's one that states it plainly:

http://www.efsa.europa.eu/en/scdocs/doc/ans_ej1082_L-Selenomethionine_op_en.p...

European Food Safety Authority, 2009, pg 2

"The half-life of L-selenomethionine (252 days) is longer than that of inorganic selenite (102 days), indicating that once absorbed, selenium from L-selenomethionine is incorporated into a long term body pool. The selenium is incorporated into tissue proteins such as skeletal muscle, liver, erythrocytes and plasma albumin from which it can subsequently be released by catabolism to maintain increased selenium status, indicating that selenium from L-selenomethionine is extensively utilised and re-utilised. Time to steady-state is reached after approximately 4.5 half-lives or about one year for selenite and about three years for selenomethionine."