Radiography, x-ray therapeutics and radium therapy (1915) (14571029600)

Identifier: radiographyxrayt00knoxuoft (find matches)
Title: Radiography, x-ray therapeutics and radium therapy
Year: 1915 (1910s)
Authors: Knox, Robert, 1868-1928
Subjects: Radiography Radiotherapy X-rays
Publisher: London : A. & C. Black
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN



Text Appearing Before Image:
FlG. 220.—Special form of gold leaf electroscope.(For description see p. 341.) KADIUM EMANATION 333 activity, and the electroscope sho^^^l iii Fig. 220 is an instrument embodpngthis 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 clmig originally to adjacent atoms and in the aggregate
Text Appearing After Image:
Fig. 221.—Apparatus for piunping oflf andcollecting radium emanation. Fig. 222. —Combined pump and apparatusfor concentration of radium emanationby liquid air. constituted a sohd substance is absent now, ^^ith the result that the newatom wanders off and exhibits the characteristics of a gas. It is hghter thanRa, but still verv hea^y. The atomic weight of the lost hehum being fourunits and that of radium 226-4, the new substance has an atomic weight of226-4 - 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 334 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 oflt from time to time, and coll