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4.
Radium was determined in the residues by two or three of the
standard mothods. (1), (2), 9 (3) e In most of the determinations
the sample was first conpletely de=emanated by fusing it with
potassium bisulfate, or solution in nitric acid. After the lapse
of a week or two the emanation which had accumulated in the sealed
sample was separated quantitatively, collected, and transforred
to the ionization chamber of a calibrated electroscope. From the
observed increase in the drift of the charged leaf of the electro-
scope the small amount of radium present in the sample was then
computed. Special care must be exercised in making radium deter-
minations on samples such as these whose radium content is extremely
small. Blank detorminations were made on all reagents used, and
the laboratory used was one restricted to measurement of very
low grade radioactive preparations.
In Table 1, are summarized the analytical results obtained
for the excrota from subject A covering a period of a week. A parallel
series was detormined for subject B$ but the results area recorded
in more condensed form. The second column givos the net weight of
the minoral ash, and in the last column the radium content is
recorded expressed in nicrowmicrograns (10-12 8.)
(1) Lind, S. C.. Jour. Ind. Eng. Chom. 1. 1024-9 (1915).
(2) Schlundt, Hes Trans. Am. Electro. Chem. Soc. 26. 163-79 (1914) Q
(3) Barker, H. H., Jour. Ind. Eng. Chem. 10, 525-7 (1918).
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"ocrText": "4.\nRadium was determined in the residues by two or three of the\nstandard mothods. (1), (2), 9 (3) e In most of the determinations\nthe sample was first conpletely de=emanated by fusing it with\npotassium bisulfate, or solution in nitric acid. After the lapse\nof a week or two the emanation which had accumulated in the sealed\nsample was separated quantitatively, collected, and transforred\nto the ionization chamber of a calibrated electroscope. From the\nobserved increase in the drift of the charged leaf of the electro-\nscope the small amount of radium present in the sample was then\ncomputed. Special care must be exercised in making radium deter-\nminations on samples such as these whose radium content is extremely\nsmall. Blank detorminations were made on all reagents used, and\nthe laboratory used was one restricted to measurement of very\nlow grade radioactive preparations.\nIn Table 1, are summarized the analytical results obtained\nfor the excrota from subject A covering a period of a week. A parallel\nseries was detormined for subject B$ but the results area recorded\nin more condensed form. The second column givos the net weight of\nthe minoral ash, and in the last column the radium content is\nrecorded expressed in nicrowmicrograns (10-12 8.)\n(1) Lind, S. C.. Jour. Ind. Eng. Chom. 1. 1024-9 (1915).\n(2) Schlundt, Hes Trans. Am. Electro. Chem. Soc. 26. 163-79 (1914) Q\n(3) Barker, H. H., Jour. Ind. Eng. Chem. 10, 525-7 (1918)."
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