Abstract
A DISC 4.2 mm. thick of the light yellow variety of transparent Bakelite was cut from a rod, polished and radiated with β and γ rays from radium. The colour of the disc darkened to a wine-red after three days, and exhibited an absorption band λ = 5700-6000, which was not visible at first. The spectrum beyond λ = 4900 A.U. was also obliterated. A similar disc placed in radium emanation became also rapidly coloured. The coloration extended to a depth of 2 mm., and it could be completely removed by exposure to a temperature of 100° C. for about three hours.
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PHILLIPS, C. Action of Radium Rays on Bakelite. Nature 93, 295 (1914). https://doi.org/10.1038/093295c0
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DOI: https://doi.org/10.1038/093295c0
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