. On Acquired Radio-Activity . is transient activity can be completely removed by washing in diluteacids (31). Many substances become coloured by direct exposure to radium, the colourdepending on the substance. Diamonds take a full sage-green tint, the depthdepending on the time of exposure to the radium (33). In addition to change of colour diamond also becomes persistently radio-activecontinuously giving off a-, 8-, and y-rays. The acquired colour and activity with-stand the action of powerful chemical agents, and continue for years with apparentlyundiminished activity (12, 31, 32). Removing
. On Acquired Radio-Activity . is transient activity can be completely removed by washing in diluteacids (31). Many substances become coloured by direct exposure to radium, the colourdepending on the substance. Diamonds take a full sage-green tint, the depthdepending on the time of exposure to the radium (33). In addition to change of colour diamond also becomes persistently radio-activecontinuously giving off a-, 8-, and y-rays. The acquired colour and activity with-stand the action of powerful chemical agents, and continue for years with apparentlyundiminished activity (12, 31, 32). Removing the surface by mechanical means removes both colour and radio-activity (13, 16, 35, 37, 41). The appearance of an auto-radiograph made by placing an active diamond crystalon a sensitive photographic plate, and the visual examination of its iC scintillation?luminosity, suggest that there is a special discharge of energy from the cornersand points of the crystal (18, 21, 23, 27, 33). Crookes. Phil. Trans., A, vol. 214, Plate Fig. 1.
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