... h 22 8Ac 23 2 22 81.9 y56 s0.15 s3.7 d 21 2Pb 21 6Po 22 0Rn 22 4Ra11 h 21 2Bi 21 2Po 20 8Tl61 m(64%)3.1 m61 m(36%)3.1× 10−7s 20 8Pb DK594X_book.fm Page 27 Tuesday, June 6, 20 06 ... Isotope s and updates[5–7].4.7 × 109y 23 4 24 d 4 .2 m 23 8U 23 4Pa 23 4U 2. 4× 105y3.8 d1.6 × 103y7.7 × 104y 22 2Rn 22 6Ra 21 8Po 23 0 21 4Pb3 m 21 4Bi 21 4Po 21 0Pb 20 m6.4 × ... d 21 9Rn 22 3Ra 21 5Po 22 7 21 1Pb8 ×10−4s 21 1Bi 20 7Tl 20 7Pb36 m 2. 1 m 4.8 m 22 3Fr 22 y (1%) 22 m3.3 × 104y DK594X_book.fm Page 28 Tuesday, June 6, 20 06 9:53 AM© 20 07 by Taylor...