Frederic Joliot-Curie: "Kami membombardir aluminium dengan sinar alpha...

"Kami membombardir aluminium dengan sinar alpha ... lalu setelah periode iradiasi tertentu, kami menghilangkan sumber sinar alpha. Kami sekarang mengamati bahwa lembaran aluminium terus memancarkan elektron positif selama beberapa menit."

--- Frederic Joliot-Curie

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Versi Bahasa Inggris

We bombarded aluminum with alpha rays … then after a certain period of irradiation, we removed the source of alpha rays. We now observed that the sheet of aluminum continued to emit positive electrons over a period of several minutes.