Model of a cobalt-60 source
1985
1985
1986
1985
1985
1986
2000-100 BCE
1985
1986
1985
1986
1985
1985
1985
1990-96
1985
1985
4000-2001 BCE
1986
1986
circa 1985
1985
1986
1970 and post 1989
10000-5000 BCE
1985
1985
1986
1985
1986
1985
1986
1986
1985
1985
8500-2000 BCE
1985
5000-500 BCE
1986
2686-2613 BCE
2000 BCE
8500-2000 BCE
8500-2000 BCE
8500-2000 BCE
8500-2000 BCE
1985
1985
1985
8500-2000 BCE
1985
8500-2000 BCE