A mass spectrograph for the separation of small quantities of radioactive isotopes is described. This allows a direct determination of the mass numbers of radio-isotopes. It also permits the determination of the radiation characteristics of each of several radio-isotopes of an element where these have long half-lives, or have half-lives of the same order of magnitude. Slit counter and photographic plate techniques for analysis of deposits are described. An example, the analysis of a rare earth mixture, is described.
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Lewis et al. (1948) studied this question.