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Thorium is an alpha emitter and, once in the body, it can cause cancer and other anomalies.

The tests came back positive for polonium-210, an alpha emitter.

Their method involved bombarding aluminum foils with alpha rays produced by their usual rudimentary source, a hunk of the inexpensive but vigorous alpha emitter polonium.

One day he told Seaborg triumphantly that he had found an alpha emitter and had already ruled out that it could be an isotope of element 91, 92, or 93.

There, scientists suspected that polonium, a powerful alpha emitter, was involved.