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"Every scientist worth his salt that I know of has read science fiction."
- Greg Bear

Iron Collar  
  Persons designated as "Risks" must wear explosives.  

"For they were Risks; and the iron collars they wore contained eighty grams of a high explosive. A step into an area proscribed for Risks (and such areas were common all over the world) meant that a triggering radar beam would touch off the explosive. Ryeland had seen that happen once. He didn't want it to happen to him..."

"The collar isn't a punishment. It's a precaution."
"Precaution?"
He said steadily: "The Machine has reason to believe that under certain circumstances I might work against the Plan of Man. I have never done anything, you must understand that. But the Machine can't take chances, and so---the collar.


(Explosive collar from "The Reefs of Space" by Pohl and Williamson)

Technovelgy from The Reefs of Space, by Jack Williamson (w/F. Pohl).
Published by If: Worlds of Science Fiction in 1963
Additional resources -

In the movie Wild Wild West (1999), James West and Artemus Gordon attempt an escape:

Compare to the Badge of Office Explosive from A Ticket to Tranai (1955) by Robert Sheckley and the cyborg collar from A Specter is Haunting Texas (1968) by Fritz Leiber.

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Additional resources:
  More Ideas and Technology from The Reefs of Space
  More Ideas and Technology by Jack Williamson (w/F. Pohl)
  Tech news articles related to The Reefs of Space
  Tech news articles related to works by Jack Williamson (w/F. Pohl)

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