L 1680 (OTTO) Lanthanum(III) bromide, hydrate, 99.99% Cas 224183-16-8 - used as a scintillation material in certain applications. L 1680 (OTTO) Lanthanum(III) bromide, hydrate, 99.99% Cas 224183-16-8 - used in gamma spectroscopy radioisotope detection.