Post your favorite improvised doohickeys (incl. vehicles)

https://suppo.fi/post/2910863

Slightly modified doohickey

Assuming this worker, how big would the explosion be with this payload?
No explosion, just radiation and heat. Everyone nearby is dead, just not instantly.
How far is nearby?

The closer the faster, days to weeks if you’re getting the full dose, months if you’re unlucky enough to get prolonged medical treatment

Further away, you might get away with losing your hair and developing cancer