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
6%
12%
68%
12%
16
flagAustralia
10%
3%
65%
20%
29
flagthe United States
5%
28%
42%
23%
38
flagIndia
4%
31%
36%
28%
100
flagGermany
14%
21%
34%
29%
55
flagAustria
9%
27%
27%
36%
11
flagPoland
13%
38%
25%
21%
1418
flagthe United Kingdom
11%
34%
19%
34%
26