I think the chart is correct. I was exposed to acute radiation 8 hours on the ground in Chernobyl with up to 800 mSv in some parts the buildings/reactors and the clean up claw was reading 860 mSv alone. About 5 minutes exposure to the claw. when I returned to Kiev about 4 hours later after the exposure I started to feel light headed with a headache and began sweating profuse with a high temp without vomiting. The symptoms lasted about 8 hours and I then felt perfectly normal after the symptoms were gone and bought a bottle of Red Wine and took it easy the following day. There’s my 2 bits to this.