. Light energy, its physics, physiological action and therapeutic applications . Fig. 47.—Radium-graph of Dead Human Fig. 48.—Radium-graph of a Mouse in a Trap. RADIUM. 7I9 ject is laid. The same result is obtained in an hour if theradium is placed at 20 cm. distant from the plate. A sensi-tive plate is immediately impressed in the immediate vicinityof the radiant source. Induced Radio-Activity.—Substances which have been incontact with radium become radio-active and their radio-activity lasts for varying periods of time. Professor Curiestates that it is impossible for him to go near hi
. Light energy, its physics, physiological action and therapeutic applications . Fig. 47.—Radium-graph of Dead Human Fig. 48.—Radium-graph of a Mouse in a Trap. RADIUM. 7I9 ject is laid. The same result is obtained in an hour if theradium is placed at 20 cm. distant from the plate. A sensi-tive plate is immediately impressed in the immediate vicinityof the radiant source. Induced Radio-Activity.—Substances which have been incontact with radium become radio-active and their radio-activity lasts for varying periods of time. Professor Curiestates that it is impossible for him to go near his instrumentsto make any measurements for hours after being nearradium, and those who work with it, find it extremely diffi-cult to keep their tools, instruments and themselves free fromthe radio-activity imparted by the radium. Falling rain andsnow are for a time quite powerfully radio-active and light-ning rods and even the leaves of trees also become radio-active. It was found by McLennan that rain caught in avessel and immediately evaporated to dryness, imparted aradio-activity to the vessel. Hammer found a pi
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishere, booksubjectlight
