Absorption plate set for gamma radiation

[Physikfan]

On Ebay I found an absorption plate set for gamma radiation:

[babysitter]

Genosse Abschirmski!

[CopperCone]

The finish on that lead plate looks trashy. Give it a gentle sanding over and a coat of polyurathane.

[InductorbackEMF]

Is that plate just made of lead? If so with the amount of lead i have i could build two boxs haha.

[Kleinstein]

The plated have a defined thickness. So one could add a thin layer of varnish, but should not remove much oxide.

The plated are made from different materials: lead, aluminum, copper and iron.  The list of contents (first picture) gives a good list.

This set looks like made for schools / education, so nothing extra accurate.