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.
It follows that the additional radiation exposure due to eating a banana lasts only for a few hours after ingestion, . the time it takes for the normal potassium content of the body to be restored by the kidneys. The EPA conversion factor, on the other hand, is based on the mean time needed for the isotopic mix of potassium isotopes in the body to return to the natural ratio after being disturbed by the ingestion of pure 40 K, which was assumed by EPA to be 30 days.  If the assumed time of residence in the body is reduced by a factor of ten, for example, the estimated equivalent absorbed dose due to the banana will be reduced in the same proportion.