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in the form of insoluble sulphate salts are resoved from the
solution; second, these sulphate salts are treated to remove
certain impurities and are then converted into an acid moluble
form and additional impurities are rezoved; third, these salts,
with the impurities removed, are converted into radium and
barium chloride or bromide salts; and, finally, the radium
and bariun are separated by a process of fractional crystal-
lization, resulting in a radium bromide salt of approximately
90 to 98% purity. This bromide selt is in the forma of a white
crystalline povder.
the only method of determining the quantity of
radium present in the radium bromide salte is by neasuring
the intensity of the emitted radiations. The redium in the
bromide salts enits only the alpha radiation, the intensity
of shich does not permit of accurate acasurement because
the alpha ray has only a very slight penetrating pover. But
the ganma rays, which have à strong penetrating pover, permit
of accurate measurement, and accordingly, the quantity of
radium 1s deternined by nessuring the garma radiation from
the decay elements in equilibrium with the redium. the
ganna ray is not emitted in the series of disintegrations
until radium c (bismuth 214) is reached. Starting with
radium in the form of the bromide salts, the next element
is radon, a gas, and unless the bromide salts are sealed
the gaseous radon will be dissipated in the air, thus
-7-
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"ocrText": "in the form of insoluble sulphate salts are resoved from the\nsolution; second, these sulphate salts are treated to remove\ncertain impurities and are then converted into an acid moluble\nform and additional impurities are rezoved; third, these salts,\nwith the impurities removed, are converted into radium and\nbarium chloride or bromide salts; and, finally, the radium\nand bariun are separated by a process of fractional crystal-\nlization, resulting in a radium bromide salt of approximately\n90 to 98% purity. This bromide selt is in the forma of a white\ncrystalline povder.\nthe only method of determining the quantity of\nradium present in the radium bromide salte is by neasuring\nthe intensity of the emitted radiations. The redium in the\nbromide salts enits only the alpha radiation, the intensity\nof shich does not permit of accurate acasurement because\nthe alpha ray has only a very slight penetrating pover. But\nthe ganma rays, which have à strong penetrating pover, permit\nof accurate measurement, and accordingly, the quantity of\nradium 1s deternined by nessuring the garma radiation from\nthe decay elements in equilibrium with the redium. the\nganna ray is not emitted in the series of disintegrations\nuntil radium c (bismuth 214) is reached. Starting with\nradium in the form of the bromide salts, the next element\nis radon, a gas, and unless the bromide salts are sealed\nthe gaseous radon will be dissipated in the air, thus\n-7-"
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