Abstract
A technique is described which allows the study of the concentration of silver-iodide particles produced by a ground generator. It consists of marking these particles with Iodine 131, then filtering the air at the required places with air-borne filters. The iodine is extracted chemically, concentrated in a very small silver iodide disc which is then placed upon a nulcear emulsion. After two weeks the activity is measured by electron track counting. Limitations of the method are given.
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