This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...of decay. It must be borne in mind that the name radiolead was given to the active substance because it was first separated mixed with lead, but we now know that the active substances contained in it have no more connection with lead than radium has with the barium from which it is finally separated. 1 The identity of ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...of decay. It must be borne in mind that the name radiolead was given to the active substance because it was first separated mixed with lead, but we now know that the active substances contained in it have no more connection with lead than radium has with the barium from which it is finally separated. 1 The identity of the active constituent of radiotellurium and polonium has now been definitely settled. Mme. Curie (Comptes rendus, Jan. 29, 1906) has accurately determined the loss of activity of polonium, and found that it decayed according to an exponential law with a period of 140 days. This period of decay is practically identical with that found for radiotellurium and radium F. Hofmann, Gonders, and Wolfl 1 in the course of a chemical examination of a specimen of radiolead obtained the following results. Experiments were first made on the effect of adding substances to a solution of radiolead and then removing them by precipitation. Small quantities of the platinum metals in the form of chlorides were left in the solution for several weeks and then precipitated by formalin or hydroxylamine. All of these substances after separation were found to give out a and /S rays. Most of the /S ray activity disappeared in about six weeks, and the a ray activity in about one year. We shall see that the /S ray activity is due to the separation of radium E, which decays to half value in 6 days, while the a ray activity is due to radium F. This conclusion is further confirmed by experiments on the effect of heat on the activity of these substances. At a full red heat, the a ray activity was lost in a few seconds. This is in agreement with experiments on radium F which is volatilized at about 1000 C. Salts of gold, silver, and mercury, added to the solution of radiolead, ..
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