. Radioactive transformations . 1 Godlewski: Phil. Mag., July, 1905. 2 Giesel: Jahrbuch. d. Radioaktivitat, i, p. 358 (1904). 3 Hahn (Nature, April 12, 1906) has recently separated another product fromactinium which he has called radioactinium. This product is intermediate betweenactinium and actinium X, emits a rays, and has a period of transformation of about 168 RADIOACTIVE TRANSFORMATIONS Godlewski showed that the emanation from actinium was adirect product of actinium X, and not of actinium itself. Inthis respect, ThX and actinium X have very similar transformations
. Radioactive transformations . 1 Godlewski: Phil. Mag., July, 1905. 2 Giesel: Jahrbuch. d. Radioaktivitat, i, p. 358 (1904). 3 Hahn (Nature, April 12, 1906) has recently separated another product fromactinium which he has called radioactinium. This product is intermediate betweenactinium and actinium X, emits a rays, and has a period of transformation of about 168 RADIOACTIVE TRANSFORMATIONS Godlewski showed that the emanation from actinium was adirect product of actinium X, and not of actinium itself. Inthis respect, ThX and actinium X have very similar transformations taking place in actinium are shown inFig. 40. On comparison of the changes taking place in actinium andthorium (see Fig. 41) the similarity in the succession of changesin the two substances is very noteworthy. Not only are theproducts equal in number, but the corresponding products areclosely allied in general chemical and physical properties. Theactive deposit of actinium differs somewhat from that of thoriumOapt. Qctpt. ACT/MUM. £M/?N/1T/OM. ACTA. Fig. and its family of products. in the ease with which it is dissolved by various solutions andthe lower temperature at which it is volatilized. This similarity in the radioactive changes of the two sub-stances indicates that the atoms of actinium and thorium, whilechemically distinct, are very similarly constituted, and thatwhen once the process of disintegration is started, the atom ofboth substances passes through a similar succession of changes. Connection between the Radioelements The series of transformations taking place in the radioele-ments are shown in Fig. 20 days. Actinium itself is a rayless product. Godlewski had unknowingly separatedthis product from his actinium, for otherwise the actinium would have emitted a rays,due to the presence of radioactinium. Levin has found that actinium X does not emity8 rays. The /3 rays from actinium arise only from the product actinium B. 1 In t
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