Fundamental Studies on Radiation Thickness Gage

(III) Analysis of Statistical Errors

Abstract

The errors in question are caused by many factors, such as the counting rate of radiation, pulse height spectrum induced in a radiation detector, transfer function of a measuring system and absorption characteristics of samples. The relationship between these factors has been given by a formula.
The statistical properties of the output wave have been proved to be similar to the Gaussian noise. Using these properties, a formula has been induced for calculating the optimum intensity of radiation to detect a given small change of thickness.