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solution is stirred to distribute the radium salt on the
crystals and while stirring 18 continued a soluble sulphate
anlt (e.g. ammonium sulphate) solution is added to form an
insoluble radium sulphate coating on the sine sulphide
crystals. The conted crystals are then dried by evaporat-
ing the water, are screened to break up lumps, and eserge in
the form of a light yollow powder. The dry powder is bottled in
a simple glass container, usually containing about one gran of
compound. Immediately prior to use, the powder compound is
mixed with en adhesive or lacquer and applied to instruments
requiring illumination, such a.s the dials of clocks, watches
and other instruments, and pointers, and various instrument
components. When so applied, the radium salt rezains in intim-
ate contact with the sine sulphide and the alpha rediations im-
pinge directly upon the zine sulphide crystals, eausing the
crystals to enit innumerable and incessant points of light,
thus illuminating the instrument or dial upon which applied.
The consistency of the compound, depending upon the special
application, may be varied by the use of a lacquer thinner.
The radium salts as such have no effect upon the zine sulphide
erystals; it is the radiation of the alpha particles continally
given off by the radium salts, which, when conning in contact
with the zine sulphide crystals, creates the illumination.
The yellow compound salts in a simple glass con-
tainer are accompanied by a separate bottle containing the
-18-
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Context sent to Scholar
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"ocrText": "solution is stirred to distribute the radium salt on the\ncrystals and while stirring 18 continued a soluble sulphate\nanlt (e.g. ammonium sulphate) solution is added to form an\ninsoluble radium sulphate coating on the sine sulphide\ncrystals. The conted crystals are then dried by evaporat-\ning the water, are screened to break up lumps, and eserge in\nthe form of a light yollow powder. The dry powder is bottled in\na simple glass container, usually containing about one gran of\ncompound. Immediately prior to use, the powder compound is\nmixed with en adhesive or lacquer and applied to instruments\nrequiring illumination, such a.s the dials of clocks, watches\nand other instruments, and pointers, and various instrument\ncomponents. When so applied, the radium salt rezains in intim-\nate contact with the sine sulphide and the alpha rediations im-\npinge directly upon the zine sulphide crystals, eausing the\ncrystals to enit innumerable and incessant points of light,\nthus illuminating the instrument or dial upon which applied.\nThe consistency of the compound, depending upon the special\napplication, may be varied by the use of a lacquer thinner.\nThe radium salts as such have no effect upon the zine sulphide\nerystals; it is the radiation of the alpha particles continally\ngiven off by the radium salts, which, when conning in contact\nwith the zine sulphide crystals, creates the illumination.\nThe yellow compound salts in a simple glass con-\ntainer are accompanied by a separate bottle containing the\n-18-"
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