Complex sentence: Some old industrial smoke detectors (notably the Pyrotronics Corporation) can contain up to 80 μCi This amount declines slowly as the americium-241 decays into neptunium-237, a different transuranic element with a much longer half-life (about 2.14 million years).
Split into simpler sentences: Some old industrial smoke detectors (notably the Pyrotronics Corporation) can contain up to 80 μCi. The amount of 241 Am declines slowly as it decays into neptunium-237 a different transuranic element with a much longer half-life (about 2.14 million years).