What is the name of the most radioactive isotope on the planet?

Rad 226
Uranus 235
Polonium 210
plutonium 244
210Po is extremely toxic, with one microgram being enough to kill the average adult (250,000 times more toxic than hydrogen cyanide by weight). 210Po was used to kill Russian dissident and ex-FSB officer Alexander V. Litvinenko in 2006.
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Answers by country

Rad 226
Uranus 235
Polonium 210
plutonium 244
answers
flagGreece
5%
11%
64%
17%
17
flagAustralia
11%
5%
61%
20%
34
flagAustria
13%
13%
37%
34%
29
flagthe United States
6%
30%
36%
26%
60
flagGermany
15%
18%
34%
29%
128
flagIndia
8%
33%
30%
26%
142
flagPakistan
0%
50%
30%
20%
10
flagPoland
13%
38%
27%
20%
1788
flagNigeria
6%
41%
27%
24%
29
flagthe United Kingdom
11%
28%
16%
40%
42
flagthe Netherlands
33%
0%
8%
58%
12