Environmental Applications of 210Po and 210Pb in the Brazilian Amazon and Other Sites

210Po is an intermediary member of the natural mass number (4n+2) 238U decay series that finishes at a stable 206Pb, according to the sequence: 238U (4.49 Ga, a) ® 234Th(24.1 d, b-) ® 234Pa (1.18 min, b- ) ® 234U (0.248 Ma, a) ® 230Th (75.2 ka, a) ® 226Ra (1622 a, a) ® 222Rn (3.83 d, a) ® 218Po (3.05 min, a) ® 214Pb (26.8 min, b-) ® 214Bi (19.7 min, b-) ® 214Po (0.16 ms, a) ® 210Pb (22.26 a, b-) ®...