Explainer: What are depleted uranium weapons and what are the risks?

News Snapshot:

A shell is fired from a Challenger 2 barrel for the first firing of Depleted Uranium shells from Kirkcudbright Training Area in Dumfries and Galloway February 20, 2001. BR Acquire Licensing Rights March 23 (Reuters) - Britain said it would supply armour piercing munitions containing depleted uranium to Ukraine to help destroy Russian tanks, a step President Vladimir Putin said would force a response from Moscow as the weapons had "a nuclear component". What are these weapons and what are the risks? WHAT ARE THESE MUNITIONS? Depleted uranium is a dense by-product left over when uranium is enriched for use...