Come now and at least do a little research.
http://wonderfulengineering.com/this-is-what-happens-when-human-body-is-exposed-to-radiation-graphic-content/
https://www.unbelievable-facts.com/2016/12/hisashi-ouchi.html
They were trying to keep a man who had incredible amounts of radiation poisoning alive as long as possible.
Still, pretty fucked up.
I mean, there may be more to it than that, but that's at least the origin of the official story.