Required thickness of one's shelter walls for protection from gamma radiation

oh

kool

https://www.youtube.com/watch?v=7AEd-R84_No

If it can be measured then it can be fought

I saw old soviets dosometers on ebay

They were issued to civilians

They cost like 10 bucks

Wonder if they're accurate cuz that could be a good deal

More on blackout curtains @Ann Hiro:
in a SHTF situation, such curtains could do the opposite by keeping light inside a room *in,* as not to give away that you have access to light and other shit

in extreme cases you could close the curtains all the way and simply duct tape/nail/staple them shut to the walls on which they rest