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magnet was found to be no more than 3 percent of the total field. Voltage variations in time were due chiefly to changing vacuum conditions in the accelerating tube and in the rectifiers. Although frequent shut-downs were necessary to adjust the hydro- gen leak and refill the cooling jacket of the source, care was taken to "break in" the tubes with voltage until vacuum conditions were fairly steady before resuming readings, since according to the results of Henderson'" a change of voltage of 2' percent at 250 kv results in a change of 6 percent in the number of disintegrations. The stopping power of the windows in the target chamber was approximately 3 cm, while the distance from the windows to the ionization chamber was 1' cm. The total stopping power of mica and air in the path of the alpha-particles was, accordingly, only 4' cm. Since the range of the particles was 8.4 cm, slight variations in the thickness of the windows introduced no error in determining the number off particles reaching the ionization chamber. In order to avoid variations due to the thick- ness of the target traversed by alpha-particles on their way to the window
Physical Review – American Physical Society (APS)
Published: Jan 1, 1936
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