Also, what exactly is the point of radioactive tools? Most of them (Excluding Naquadriah for example) have no clear benefits towards other, more common materials, but have the massive drawback of the radioactivity enchantment. While it sure is realistic, nearby entities (Mobs, Animals) should be effected by the radioactivity too, to make it atleast somehow worthwhile, given the requirement of a Hazmat Suit (which doesn't has much durability) to even properly use them.
Use Radio-Active materials to craft arrow tips and arrows.
They are very handy to fight the Ender Dragon.
RadioActive material arrows only harm target on hit. So they are safe in your inventory.