Errors caused by serious malfunctioning of instruments will generally be discovered because they create unbelievable results. Small deviations are much more difficult to detect. Sections 6.4.2 and 7.6 dealt with aberrant processes taking place at high count rates and discussed preventive measures. The effect of noise, another instrument distortion, has been discussed in Sections 6.4.5 and 7.7.4. Still another deviation from the true results caused by instruments may be introduced by the scaler (see Sect. 2.3.5). The time base (Sect. 11.2.1) which opens and closes the counting gate can be coupled to the line frequency, and fluctuations in this will be reflected in the results obtained.
KeywordsCount Rate Background Activity Sample Activity Counting Efficiency Counting Gate
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References and Notes
- 1.M. R. Spiegel, Theory and Problems of Statistics, Schaum Publishing Company, New York (1961). An easily understood book on statistics.Google Scholar
- 2.Hewlett-Packard Company, Statistical Comparison of Digital System and a Ratemeter for Nuclear Measurements, Application Note 79, Palo Alto (1966). Discusses accuracies obtainable with a scaler and a ratemeter.Google Scholar
- 10.W. L. Nicholson, Statistics of net-counting-rate estimation with dominant background corrections, Nucleonics 24:118 (August 1966). Deals mainly with the problem of determining whether a certain amount of activity is present.Google Scholar
- 11.R. Loevinger and M. Berman, Efficiency criteria in radioactivity counting, Nucleonics 9:26 (July 1951). A good discussion of statistical counting problems.Google Scholar