T 1⁄2 July 8, 2019 16 32 64 128 T 1 2 T 1 2 ring size T 1 2 meaning T 1 2 half life T 1 2 formula T 1 22 T 1 2 meaning medical T 1 2 3 T 1 2 10 T 1 2 4 T 1 2 derivative T 1 )( 2t 4 T 1 2 8 T 1 2 integration T 1 2 copper