Let's take a look at how deadly nuclear radiation is by looking at the medical outcomes of certain people in the same room as a critical demon core. (ye nuclear weapon minus the weapon)

>The demon core (like the core used in the bombing of Nagasaki) was, when assembled, a solid 6.2-kilogram (14 lb) sphere measuring 8.9 centimeters (3.5 in) in diameter. The core of the device used in the Trinity Test did not have an anti-jet ring.

• Private Robert J. Hemmerly died 33 years after exposure to critical core (of old age)
• Alvin C. Graves died 19 years after exposure to critical core (of old age)
• Samuel Allan Kline died 55 years after exposure to critical core
• Dwight Smith Young died 29 years after exposure to critical core (of old age)
• Raemer Edgar Schreiber died 52 years after exposure to critical cor
• Theodore Perlman died 42 years after exposure to critical core (of old age)
• Patrick Joseph Cleary KIA, Korean War, 4 years after exposure

(Science Weapon)
https://archive.ph/vWF8t