Radium and its salts continually give off a gas, created by the disintegration of the radium atoms, called emanation, which sends forth the same rays that radium does. The amount of emanation issuing from a gram of radium is called a curie, that coming from a milligram of radium, a millicurie. A millicurie is the exact equivalent in irradiating power of a milligram of radium. Radium emanation is collected from a gram, or more, of radium chlorid by means of a mercury vacuum pump which forces it into sealed glass capillary tubes, the thickness of a horsehair and ⅓ inch (8.5 mm.) long. Up to 400 millicuries of emanation, the equal of 400 mg. of raduim, may thus be condensed in one emanation tube, from 50 to 100 millicuries being, however, the usual amount. The glass emanation tubes are enclosed in little silver enameled tubes, ⅝ inch (15.8 mm.) long
FREER OT. CARCINOMA OF THE LARYNX TREATED LOCALLY WITH RADIUM EMANATION: A CLINICAL REPORT. JAMA. 1922;79(19):1602–1606. doi:10.1001/jama.1922.02640190040015
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