I suppose this relates to Roentgens. 1 Roentgen is 2 billion ionizing events in 1 cc of air, so 2e6 events ( per cc ) per second would be a milliroentgen per second. Maybe that's where the 2 came from. The linked article states, "An exposure of 500 roentgens in five hours is usually lethal for human beings" and 1 milliroentgen per second is 3.6 roentgens per hour, so that's getting up there, if my interpretaion of this number is correct.
What a mess.
Beats me. Units of measure keep changing and the type of measure seems incomplete i.e. sometimes you need a core depth to relate it to some reading and they don’t bother to tell you the depth of the sample taken.
Otherwise, it looks like the evacuation zone should be larger due to these random higher reading showing up further away from ground 0.