Identifier: philtrans09550808 (find matches)
Title: The Emission and Transmission of Rontgen Rays
Year: 1909 (1900s)
Authors: Kaye, G.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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used. As the thickness of screen is increased, silver and lead rise intoplace as before, but iron, nickel, and copper now increase their values and form well-marked maxima. Over a considerable range, when anticathodes of copper and nickelare used, more radiation emerges from a copper screen than is the case when theanticathode is of platinum or lead, although the latter have much higher atomic weights. s 2 132 ME. G.W. C. KAYE ON THE It will be noticed that the nearer the atomic weight of the radiator is to that ofcopper, the more marked and extensive is the maximum. The higher the atomic weight, the thicker is the screen at which the peak of thecurve occurs. The diagram provides a good indication of the amount of radiationspecially penetrating to copper which is present in each case. The resemblancebetween the radiations from nickel and copper, especially for the thinner screens, isnoticeable. The case of silver is interesting. As mentioned above, its surface became too Pt. Rao/a tor
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XiQOSc/vt. THICKN£dS or PT SCREEN- •ooio 0015 •oozo O025 Fig. 5. Pt screen, 28,000 volts. amalgamated, and hence its radiation could be expected to show features indicative ofboth silver and mercury. This is the explanation of why the graph shows a firstweak maximum, due to silver, and afterwards rises again owing to the presence ofthe mercury. With the thickest copper screens there is every indication that, just as with screensof aluminium, the relative values for the penetrating radiations eventually follow theorder of the atomic weights of the radiators, though even with the thickest screenstried the value for the copper radiation is still distinctly relatively higher than withthe aluminium screens.# * This gradual dying away of the selective transmission, as the rays increase in hardness, is inaccordance with the behaviour of the y rays, which ignore atomic structure. EMISSION AND TRANSMISSION OF RONTGEN RAYS. 133 Platinum Screens.—If we now turn to the transmission curves

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