. Effects of the rays of radium on plants . RAOIUNl EMAN. RADC RAD F iOOQifr3. zjSiaAji Smins,. zSmini- iSmina. •'K)j<ri. Sdaj^& 4SAaAfa /4oa<U)-s. f^aetio-LeO'i' RaiiO' J -v— ' Active Deposit Rapid Change Active Deposit Slow Change Fig. I. Theory of Atomic Disintegration. (After Rutherford.) forthe given product to become half transformed. Thus, it requires 2,000 years f for a given quantit}^ of radium to become half trans- formed into the next following product. Uranium is now generally regarded as the ancestor of radium, but ther
. Effects of the rays of radium on plants . RAOIUNl EMAN. RADC RAD F iOOQifr3. zjSiaAji Smins,. zSmini- iSmina. •'K)j<ri. Sdaj^& 4SAaAfa /4oa<U)-s. f^aetio-LeO'i' RaiiO' J -v— ' Active Deposit Rapid Change Active Deposit Slow Change Fig. I. Theory of Atomic Disintegration. (After Rutherford.) forthe given product to become half transformed. Thus, it requires 2,000 years f for a given quantit}^ of radium to become half trans- formed into the next following product. Uranium is now generally regarded as the ancestor of radium, but there are several intermediate disintegration products of uranium, and of these tonmni, discovered by Boltwood,^^ may be the immediate is static or potential. The internal energy of the hypothetical atom at which others are working is kinetic. " The disintegration of radium in the former case is comparable to the explosion of an unstable chemical compound, like gun-cotton. In the latter case it must be rep- resented by something more akin to the flying to pieces of a single rapidly spinning unit, such as a fly ; *Duane** states that radium 5, formerly held by Rutherford "^ to be non-radio- active, emits as much negative electricity as does radium C. t Results obtained by Boltwood'^ on the growth of radium in preparations of ionium separated from uranium minerals indicate that the half-value period for radium is 2,000 years. Rutherford'-^" gives 1,760 years.
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