. Carnegie Institution of Washington publication. 36 NUCLEATION OF THE UNCONTAMINATED ATMOSPHERE. The fog limit of filtered air after the radium is withdrawn soon regains its original value; but some definite time (say 15 minutes) is necessary even here. It does not seem to vary appreciably with the time of exposure. (See figs. 31, 32.) As the radium of low power (10,000X) is inclosed in glass cm. thick, it is probable that /? and y rays are chiefly responsible for the nucleation. Hence it appears that nuclei are produced by suffi- ciently swift moving corpuscles as well as by the X-rays,
. Carnegie Institution of Washington publication. 36 NUCLEATION OF THE UNCONTAMINATED ATMOSPHERE. The fog limit of filtered air after the radium is withdrawn soon regains its original value; but some definite time (say 15 minutes) is necessary even here. It does not seem to vary appreciably with the time of exposure. (See figs. 31, 32.) As the radium of low power (10,000X) is inclosed in glass cm. thick, it is probable that /? and y rays are chiefly responsible for the nucleation. Hence it appears that nuclei are produced by suffi- ciently swift moving corpuscles as well as by the X-rays, an important result bearing on an inquiry suggested above. This will be further substantiated in the next chapter in favor of the gamma -A ladmA £fa ( & Sccaq. V 35 •\^. I — -JfT,S. ""^•4 ••- {wlffn, Seoty STX. 25 26 FIGS. 33-34.—Apertures of coronas (5) and nuclea- tions (n) varying with the pressure differences (5/), for the case of dust-free air energized by radium acting from different dis- tances. FIGS. 35-37. — Decay curves found after the re- moval of the radium from the fog chamber. Table n, referred to iii fig. 33, will be fouud as table 20, P- 37. Table 12, referred to in fig. 35, will be found as table 21, P. 3S. Table I2a, referred to in fig. 37, will be found as table 22, p. 40. 33. Data for nucleation.—The results for nucleation in case of a dust-free atmosphere energized by radium (io,oooX) contained in a hermetically sealed glass tube are clearest in the third part of table 18, where nearly straight w-curves for inferior and superior coronas may be made out (fig. 28). Part 2, containing data obtained shortly. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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