B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
B22D11/16—Controlling or regulating processes or operations
B22D11/18—Controlling or regulating processes or operations for pouring
B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
B22D11/187—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using X-rays or nuclear radiation