The London, Edinburgh and Dublin philosophical magazine and journal of science . for present purposes the initial periods of the curve aredisregarded and the later portions only considered, it will beseen at once that the time taken for the hydroxide to recoverone half of its lost activity is about equal to the time takenby the ThX to lose half its activity, viz., in each case about4 days, and speaking generally the percentage proportion ofthe lost activity regained by the hydroxide over any giveninterval is approximately equal to the percentage proportionof the activity lost by the ThX during
The London, Edinburgh and Dublin philosophical magazine and journal of science . for present purposes the initial periods of the curve aredisregarded and the later portions only considered, it will beseen at once that the time taken for the hydroxide to recoverone half of its lost activity is about equal to the time takenby the ThX to lose half its activity, viz., in each case about4 days, and speaking generally the percentage proportion ofthe lost activity regained by the hydroxide over any giveninterval is approximately equal to the percentage proportionof the activity lost by the ThX during the same interval. Ifthe recovery curve is produced backwards in the normaldirection to cut the vertical axis, it will be seen to do so at a the Cause and Nature of Radioactivity. 381 minimum of about 25 per cent., and the above result holdseven more accurately if the recovery is assumed to start fromthis constant minimum, as, indeed, it has been shown to dounder suitable conditions (section IX., fig. 4). This is brought out by fig. 3, which represents the recovery Fiar.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
