The video states that it looks for low number elements, such as carbon, hydrogen, and nitrogen. The first 10 elements are:
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Flourine
Neon
First thought... rather then Tyvek, wrap your house with carbon-fiber mat. And install nitrogen-filled double-sided windows. That outta burn-in the display monitor, with all that brightness.
Wait... are we actually discussing how to use low atomic-number items to shield from government x-rays?! Maybe the tin-foil hat group really wasn't off...