. Carnegie Institution of Washington publication. IO VAPOR NUCLEI AND IONS. If the radium is inclosed in a long, thick lead tube (60 cm. long, walls cm. thick), the nucleation is but moderately reduced (see crosses in fig. 6), showing that gamma-rays are in question. Table 4.—Radium effect at high pressure differences. 8p = cm.; s (air) =; D, distance from end of fog chamber. D. s. n xio—3. D. s. n xio-3. On 3-9 27 50 51 3 9 27 4 9 54 25 3 3 16 100 6 3 104 3 4 17 6 8 129 0 4 8 51 00 7 5 160 4 7 48 End 4 8 5i On 4 0 27 4 7 48 4 1 31 Top 4 6 44 0 4 4 37 4 7 48 4 7 48 E
. Carnegie Institution of Washington publication. IO VAPOR NUCLEI AND IONS. If the radium is inclosed in a long, thick lead tube (60 cm. long, walls cm. thick), the nucleation is but moderately reduced (see crosses in fig. 6), showing that gamma-rays are in question. Table 4.—Radium effect at high pressure differences. 8p = cm.; s (air) =; D, distance from end of fog chamber. D. s. n xio—3. D. s. n xio-3. On 3-9 27 50 51 3 9 27 4 9 54 25 3 3 16 100 6 3 104 3 4 17 6 8 129 0 4 8 51 00 7 5 160 4 7 48 End 4 8 5i On 4 0 27 4 7 48 4 1 31 Top 4 6 44 0 4 4 37 4 7 48 4 7 48 End 4 7 48 25 3 3 16 Top 4 7 48 'o 4 1 3i 2End 4 7 48 On top. 4 0 27 00 6 1 97 'On 3 9 27 1 Radium tube in lead pipe walls 5 cm. thick. 2 Lead Fig. 6.—Efficient nucleation (N) near the middle of the fog chamber, for different dis- tances (D) of radium from the end and for different exhaustions (dp). Table 4. 8. Cause of the minimum and the maximum.—This is easily explained, since the ions are relatively large bodies and relatively few in number as compared with the nuclei of dust-free air for the same dp. Hence the ions capture the moisture more and more fully as their number, with diminishing distance D, becomes greater. At D = 2$ cm. probably the whole of the moisture is condensed on ions, and as their number increases as D vanishes the minimum in question results. In fact, it. 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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