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" All of them showed the initial rise of about 15 per cent at the end of 18 hours, and then a normal decay to zero. The position is thus proved that the initial irregularities are caused by the secondary radiation excited by ThX upon the surrounding matter.... "
Journal of the Chemical Society - Page 854
by Chemical Society (Great Britain) - 1902
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Philosophical Magazine

1902 - 890 pages
...conditions the recovery-curve can l>e made to rise normally from ;i constant minimum, and the decay-curve be shown to consist of two curves, the first the rate...second the rate of decay of the activity as a whole. So far nothing has been stated as to whether the excited radioactivity which contributes about 21 per...
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