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Makes intuitive sense, thanks for the insight.

A second layer blockage for the secondary particles wouldn't have to be as dense or am I missing important physics?

(I guess a lot of gamma radiation would still reach this second layer so please ignore my question :)

Keep adding layers until you get to 1.3 feet of lead and it’ll work.

haha thanks for the correction - I was under the Turtles All the Way Down mindset :)

Isn't that more like how you make bombs than armors more effective - with backside spalling and secondary fragmentations?