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" The initial drop decays very approximately according to an exponential law with the time, falling to half value in about 3 minutes. Three or 4 hours after removal the activity again decays according to an exponential law with the time, falling to half... "
Philosophical Transactions of the Royal Society of London: Containing papers ... - Page 175
1905
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Radio-activity

Ernest Rutherford - Radiactividad - 1905 - 622 pages
...minutes. The family of curves obtained for different times of exposure have already been shown in Fig. 67 These results thus indicate : — (1) An initial change...minutes ; (2) A final change in which half the matter is transforme*) in 28 minutes. Before considering the explanation of the intermediate portion of the curve...
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radio-activity

International Commission on Radiation Units and Measurements, International Commission on Radiological Units and Measurements - 610 pages
...different times of exposure have already been shown in Fig. 67. These results thus indicate : — t1) An initial change in which half the matter is transformed...decay of the excited activity for a long exposure (24 hoursl is shown graphically in Fig. 8ti, curve AA. There is at first a rapid decrease for the first...
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