mleku on Nostr: tin is best for shielding from radiation, it's similar to lead in that it blocks ...

tin is best for shielding from radiation, it's similar to lead in that it blocks ionising radiation like X and gamma rays, which can also nuke microchips, it's not that expensive to get in large sheets... i calculated for my idea of a sleeping/working space in an underground house i can put a tin shield on it for about $3000

for a storage device like you talk about, the best would just be two tin-lined containers with the seal parts staggered (like a matryoshka doll sorta thing) and make the seals so they mostly mate neatly... so they aren't difficult to get open, and sit them on a grounded steel shelf to protect from any longer wavelength penetration inside a steel chest or ammo crate or similar