| To apply the autoradiographic methods, using AR-10 high resolution stripping film to metallurgical problems, a preliminary experiment for determining appropriate exposure time and three processing methods for providing a standardized procedure were carried out and they were compared one another. By using a standard C^(14) specimen, the appropriate exposure time for S^(35)-melted-in silicon-iron was determined to be about 24 days for the activity of 550 counts/m/㎠. The undesired interaction between silicon-iron specimen and water or processing solutions could be prevented by exposing the film first in the air, removing it from the specimen, and then making it adhere to the gelatine coated glass slide in water before developing. Film expansion during above processes and consequent difficulties in comparing the autoradiograph with its micrograph could be prevented by floating the film on the surface of water so as to be expanded in advance and making it adhere to the gelatine coated glass slide before exposing. The interaction between the specimen and the emulsion in the presence of moisture during the exposure could be prevented by thin gold coating on the surface of the specimen and exposing in dry atmosphere. |
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