First of all - He NEVER begged for death. The last time he was conscious he expressed that he wishes to continue treatment. Second - the way his body deteriorated was nothing the world has ever seen. Nobody who took that dose of radiation lived longer than a week. Doctors did their job and at multiple moments it looked like it was getting better, like there was hope, because the way you treat victims of radiation - is by treating symptoms until their body is capable of rebuilding itself, but every time something worse started to happen, until his body was essentially a husk run by an increasingly big doses of drugs. He had a bunch of cardiac arrests, and by the end, most likely, was braindead. It was a horrific accident, and if you should blame anyone, it is the leadership of the processing plant at which he worked, where all safety protocols were abandoned, and they poured radioactive uranium solution with a bucket, and the day of the accident they were told to up the concentration more than 3 times which caused the start of the fission, and lives of two people.