. Radiography, X-ray therapeutics and radium therapy . 220.—Special form of gold leaf electrosci(For description see p. 341.) RADIUM EMANATION 333 activity, and the electroscope shown in Fig. 220 is an instrument embodyingthis principle. Its detailed description must, however, be deferred till later. Radium Emanation The residue that remains when a radium atom has expelled an Alphaparticle is no longer radium. It is an atom of a new substance. The pro-perty whereby it clung originally to adjacent atoms and in the aggregate. Fig. 221.—Apparatus for pumping offandcollecting radium emanation. Fig
. Radiography, X-ray therapeutics and radium therapy . 220.—Special form of gold leaf electrosci(For description see p. 341.) RADIUM EMANATION 333 activity, and the electroscope shown in Fig. 220 is an instrument embodyingthis principle. Its detailed description must, however, be deferred till later. Radium Emanation The residue that remains when a radium atom has expelled an Alphaparticle is no longer radium. It is an atom of a new substance. The pro-perty whereby it clung originally to adjacent atoms and in the aggregate. Fig. 221.—Apparatus for pumping offandcollecting radium emanation. Fig. 222.—Combined pump and apparatus for concentration of radium emanationby liquid air. constituted a solid substance is absent now, with the result that the newatom wanders off and exhibits the characteristics of a gas. It is lighter thanRa, but still very heavy. The atomic weight of the lost helium being fourunits and that of radium 226-4, the new substance has an atomic weight of2264 - 4 or 222-4. It has been called the emanation, and is itself radio-active. Radium emanation can be collected, transferred, and generallymanipulated like any other gas, and the apparatus for this purpose is shownin Figs. 221 and 222. The most convenient way of liberating emanation from a radium salt 331 RADIATION THERAPEUTICS is to dissolve it in water strongly acidulated with hydrochloric acid. Thesolution placed in the bulb 1 (Fig. 221) gradually develops a supply of the gas,which may be pumped off from time to time, and collect
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