 Duplicating an early 1930's cosmic ray experiment
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Russ Edmonds
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Tue May 27 2014, 04:34PM
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Registered Member #46264
Joined: Sun May 11 2014, 05:27PM
Location: Tucson, Arizona USA
Posts: 61
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In the upper left of the first photo are two geiger tubes mounted on a circular frame. This frame can be rotated so the plane of the two geiger tubes can make different angles with vertical. The two tube are connected to a coincidence circuit that counts each time both tubes detect a particle at the same time. At the middle right of the photo shows the 360 volt power supply for the geiger tubes. At the bottom is the coincidence counter. The top row of LEDs show the background count from either tube. The bottom row of LEDs show the coincidence count. By recording the coincidence rate verses angle of the two tubes the variation of cosmic ray flux can be determined. The results of this experiment are in the next photo.
It's seen there are more cosmic rays coming straight down than from the sides. To reduce the standard deviation of these results the recording time was about 48 hours at each angle. The accidental coincidence rate has been subtracted from these results.
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