Most Radio Active Places On Earth.

[truthfollower]

People exposed to highest doses of ionizing radiation are smokers.
Even more than US radiation workers.
To find out Please watch the complete video.
Notes about measuring radiation:
Sieverts are a measure of 'effective dose' - that means they measure the biological impact of the energy transferred to tissues from radiation.
Smoking Kills(Literally)

(Video discription)
The most contentious claim may be that smokers receive the highest dose of ionizing radiation. This is not a whole body dose, but a dose to the lungs as specified in the video. References are here:
https://en.wikipedia.org/wiki/Health_effects_of_tobacco
http://www.rmeswi.com/36.html

Source of Image
https://xkcd.com/radiation/
I waive all copyright to this chart and place it in the public domain, so you are free to reuse it anywhere with no permission necessary. (However, keep in mind that I am not a radiation expert, and this chart is intended for general public informational use only.)

 

[Prince Kassad]

There is a small lake in the ural mountains in southern Russia named lake Karachay. It was used as a dumping site for radioactive waste from the nearby nuclear facility Majak - which produced weapon-grade nuclear material for bombs.

This lake is estimated to be the most polluted place on earth where you'll receive a dose of 600 roentgens or about 6 sieverts, which is 3 times the lethal dose if you stand on the shore for an hour.