The nucleation of the uncontaminated atmosphere . 37-i 5-5 5-4 33-o 6-3 33-0 5-5 5-4 37-T 5-6 I5I-3 In addition to this, the outgoing and the return series show a curi-ous case of periodicity which may or may not be real; but it is prob-able that there is decreased nucleation after 8p exceeds 40 cm. Theinitial increase of N with $fi is nearly straight and exceedingly rapid(SNjBp = 15,000, nearly). This is somewhat greater than the abovevalues for radium (about 12,000), but of the same order as the dat
The nucleation of the uncontaminated atmosphere . 37-i 5-5 5-4 33-o 6-3 33-0 5-5 5-4 37-T 5-6 I5I-3 In addition to this, the outgoing and the return series show a curi-ous case of periodicity which may or may not be real; but it is prob-able that there is decreased nucleation after 8p exceeds 40 cm. Theinitial increase of N with $fi is nearly straight and exceedingly rapid(SNjBp = 15,000, nearly). This is somewhat greater than the abovevalues for radium (about 12,000), but of the same order as the datumfor weak X-ray radiation. The corresponding data for dust-freenonenergized air, given in the same chart, show that initiallySN/Sp = 5,000, nearly, in correspondence with the earlier data so far ascan be made out. The nucleations N are throughout small as com-pared with energized air, the excess in the latter case, if mean valuesbe taken, being of the order of 100,000 nuclei per cubic centimeter. 54 NUCLEATION OF THE UNCONTAMINATED 34 38 4SJ 4<i 20 SM- 88 Figs. 52-55.—Illustrating tables 30, 31. Tab. 3, in the above chart, is replaced by the present table 30 in the text; Tab. 4, by the present table 31. GENERATION AND DECAY OF NUCLEI. 47. Fleeting; nuclei.—This brings the work to the main purposes ofthe present paper, viz, to compare the generation and decay of thenuclei produced by the X-rays when the density of ionization or ofelectrification has different values. It was shown conclusively abovethat with strong radiation the nuclei persist for hours, and it followsfrom the foregoing paragraphs that for weak ionization they are fleet-ing. Hence there must be transitional conditions, and these are to beinvestigated, both for the production and for the decay of nuclei. With such an end in view a strong X-ray tube may be placed atdifferent distances from the end of the fog chamber and the resultsreferred to the nucleation within, or the same bulb in the effic
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