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483 4. :Polonium and the active deposit of thorium emit a radiation which is completely absorbed /)y 0"64• 10 -4 cal. of alumlnlum. This radiation causes the emission of electrons from metals which it strikes. It consists of two portions, one of which is primary and not appreciably affected by an electric field; the other is secondary and consists of electrons whose velocities range from less than 3"8 • 10 ~ to more than 24"4• 10 ~cm'. Wertensteln has found that l~aC sec. emits similar softdoi:10.1080/14786441008637353 fatcat:gawjydox5zdpnp3h5wkrfbgqom