Radiotherapy machines
Having just had 30 daily treatments in one of these, I'm interested in the treatment machine's security:
https://www.varian.com/oncology/products/treatment-delivery/clinac-ix-system
I was dosed with over 50 Gray of radiation over that time, albeit concentrated on an area the size of a golf ball. These machines can easily provide that dosage to large areas as well as small.
Incorrectly programmed, it could easily kill you in one sitting.