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Figure 1 ILLUSTRATION OF NON-RANDOMNESS OF THE DISTRIBUTION OF MEASUREMENTS OF RADIOACTIVITY
Results of 1,200 consecutive measurements of an Fe-55 preparation show the non-randomness of the radioactivity. Layer lines are drawn after each 100 measurements. Instead of the expected bell-shaped curve, sharp peaks are found at certain pulse rates of the scintillation counter. The mean activity is about 31,500 pulses per second, but peaks are seen at other activity levels in the four separate trials of 1,200 consecutive measurements shown here.

Source: Courtesy of Shnoll et al., 1998. Uspekhi Fisicheskikh Nauk, Vol. 41, No. 10.

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measurements of radioactivity
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