Radioactive Standards


    RELIABLE standards of weak radioactivity are required in a number of fields of work; for example, by geologists, geophysicists and cosmologists concerned with the radioactive content of the materials of the earth's crust; by biological and medical investigators employing the technique of radioactive indicators or internal artificial radioactivity therapy; and in studies of radium and thorium poisoning. A committee of the United States National Research Council is endeavouring to facilitate the needs of such workers by preparing a series of feebly radioactive standards which will be analysed at a number of laboratories equipped to make such measurements. These standards will ultimately be deposited at, and certified by, the National Bureau of Standards at Washington, D.C., to be issued as working standards to investigators who may desire them.

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    Radioactive Standards. Nature 145, 456 (1940).

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