Abstract
The diameter of mouth of etched nuclear track has generally been measured for the purposes of examining the properties of the incident particle, obtaining the registration characteristics of the track detector and also checking the qualities of both the etching procedures and the detector itself. For increasing the efficiency of the diameter measurement, the application of an automated TV device manufactured for image analyzation was examined for the etch pits of α-particles on CR-39 plastic track detector; a comparison with precise microphotographic method was carried out. It has been confirmed that the mean value of the diameters could be determined with a sufficient accuracy and reproducibility, if the threshold level of the darkness for the etch pit image was appropriately set. It should be noted, however, that the standard deviation of the distribution of etch pit diameters was overestimated by the magnification of 1.3-1.4, which was attributed to the fluctuation of the measured values from position to position in a single visual field.
