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Penetrative Power of Radium…

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Penetrative Power of Radium Bromide. Mr. F. J. M. Page, writing from the Chemical laboratory, London Hospital, states that radium bromide seems to have more penetrating powat than the nitrate. Using the bromide hf observed a distinct luminosity on a zinc sulphide screen aftet the rays had passed through ten post-cards and the card of the screen (in all five millimetres). A diamond was found to be superior to zinc snlphide in detecting these rays; thus, on covenng tht bromide with a florin, no effect on the zinc, sulphide could be seen, whereas a diamond glowed percep. tibly when placed on a heap of five florins (8'5 mm.) over the radium salt. A barium platinocyanide screen proved to afford a slightly more delicate toO than the dia.moui.

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