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Appendix A-6

Normal Distribution

Figure 10. Variation of Radioactive Emission

Using the mean of a larger number of counts to approximate the

true mean, the distribution shows that 68.3% of the time the

count rate obtained will be within ±1 standard deviation of the

mean. Figure 10 shows the chance of counts falling within three

standard deviations. A statistical stability test may be performed

to compare the experimental standard deviation to the

theoretical standard deviation (see page 7-2).

Troxler 3241 Series User Manual

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