Abstract
IN recent years it has become a practice to deduce the radioactivity of the air (that is, its radon content) from the sampling and measurement of the short-lived radon daughter products. This method dates from the beginning of the present century1. The unique difference between the early measurements and the recent ones consists in the method of sampling the active deposit of radon; while nowadays deposition on filter paper is almost exclusively used, in the early experiments the transmutation products of radon were collected on the electrode by a strong electric field.
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