1984 年 19 巻 3 号 p. 219-223
Even for any application of CR-39, lately developed plastic track detector, to obtain informations about batch variations in track registration properties should raise the reliability in the results obtained using this detector. At the first step of the present work, uniformity within a given batch was certified through the measurement of etch pit diameter of α-particle track. Next, the following values were measured and compared between seven plates of different batches: the etch pit diameter of α-track and the thickness of removed surface by bulk-etching. Distinct differences were recognized in these values between the seven plates. An analysis on the combination of removed surface and etch pit diameter made clear that the batch variations were more remarkable in the etch pit diameter than in the thickness of removed surface by bulk-etching. The present results imply that it is necessary to check beforehand the properties of the plates by standardized procedures of α-irradiation and chemical etching and to select a highly homogenous plate.
