'Brief radiation spike' after rocket engine blast in northern Russia
bbc.com
bbc.com
[0] https://en.wikipedia.org/wiki/Project_Pluto
[1] https://en.wikipedia.org/wiki/Supersonic_Low_Altitude_Missil...
"The Big Stick with Pluto engine" https://www.youtube.com/watch?v=oVmpAD7WRxA
Project Pluto / SLAM was to be fission powered. The payload was thermonuclear though, as with typical ballistic missiles.