. On Acquired Radio-Activity . film, not discoloured at all, required twelve seconds, while the last film,which had been furthest from the radium, required eighteen seconds for discharge,showing that the greater part of the activity was near the surface and correspondedwith the coloration. Action of X-Rays on Diamond. 42. Experiments were instituted to ascertain how X-rays affected the tray full of crystals of diamond was exposed to X-rays from a hard tube,covered in card and velvet so as to prevent interference from the luminosity ofthe glass. Most of the stones became luminous—but
. On Acquired Radio-Activity . film, not discoloured at all, required twelve seconds, while the last film,which had been furthest from the radium, required eighteen seconds for discharge,showing that the greater part of the activity was near the surface and correspondedwith the coloration. Action of X-Rays on Diamond. 42. Experiments were instituted to ascertain how X-rays affected the tray full of crystals of diamond was exposed to X-rays from a hard tube,covered in card and velvet so as to prevent interference from the luminosity ofthe glass. Most of the stones became luminous—but in different degrees. Twostones specially were noticed. One large stone shone very brightly, with a blue o L Z 444 SIR OROOKES ON ACQUIRED RADIO-ACTIVITY. tint, the other, smaller, was only just luminous. A sheet of aluminium, 32 , was now interposed in the path of the X-rays, when the phosphorescence ofthe large bright stone was considerably reduced, while that of the small faintstone was not diminished at Action of /3-Rays on Diamond. These two diamonds were subjected to the action of solid radium bromide, andthe intensity of the phosphorescence thereby induced was seen to be of the samecharacter as that caused by the X-rays. An extension of the experiment withradium, described in the next paragraph, showed that the effect of phosphorescencewas mostly due to the /3-rays (10, 19, 26). 43. An apparatus (fig. 17) was fitted so that the active rays from a bottle ofradium bromide (a) should pass through a tubedrilled through a lead block (b), and allowed topass upwards on a diamond (c) supported on aplate of aluminium, 0*02 mm. thick. This wasarranged between the poles of a powerful electro-magnet, so that the active rays from the radiumshould pass through the hole and act on thediamond when the magnetism was off, and bedeflected from it when the magnetism was on. A screen of barium platinocyanide put over thehole in the lead block showed a circular spot of pho
Size: 1842px × 1356px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookaut, bookcentury1900, bookdecade1910, bookidphiltrans04238400
