elastic_gonzo

Nothing is 100% protective against x-rays. Shielding reduces the transmission exponentially, but it doesn't stop it completely.

 

Anything with a lot of electrons will be most effective. Lead is the choice because it is the heaviest stable element; lots of electrons and lots of atoms per unit volume, and it's cheap. Uranium would be effective but it's also radioactive, which sorta defeats the purpose of shielding for safety reasons. Gold and other heavy metals would be pretty good, but they are expensive.

Nothing is 100% protective against x-rays. Shielding reduces the transmission exponentially, but it doesn't stop it completely.

 

Anything with a lot of electrons will be most effective. Lead is the choice because it is the heaviest stable element; lots of electrons and lots of atoms per unit volume, and it's cheap. Uranium would be effective but it's also radioactive, which sorta defeats the purpose of shielding for safety reasons. Gold and other heavy metals would be pretty good, but they are expensive.

Maybe, I could use something harder to penetrate. For example, if I paid something too expensive and want to avoid custom payment, I could put it in concrete column, small concrete blockhead, highly enriched with hematite elements to block the x ray penetration, make that blockhead as some sort of artistic obelisk or grave monument that is too precious to break. I know that concrete gets darkened color when mixed with such additives, but it could be painted to avoid suspicion. Also, it can be thinner than regular concrete and act as one monolith structure to hide whatever is inside. Since I've seen that these, 'special' concretes are having far more density than normal concrete. If they can protect nuclear reactor from dispersing its radiation, then it could be applied here too. If you see a blockhead which looks like any other concrete block, seeing nothing inside through x ray scanner, then there's no suspicion.

Now, I'm wondering. As I've heard, materials with high dense structure, rich with hydrogen or metals with higher atomic number (denser structure) like osmium, could utterly prevent x ray scanners on customs to penetrate through them, as the strongest neutron scanner has 10MV strongest penetration ability so far (penetrating through 40cm of steel). I'm wondering which metals or other than metal materials, not lead, could be 100% protective against those scanners?

You have, Glymes, Bisphenol, Phthalates, lots of kinds of pesticides that are affecting low quality of sperm and could be good for miscarriage.