The Emission and Transmission of Rontgen Rays . O 50 100 ATOMIC WEIGHT of RADIATOR. tso 200 230 Fig. 6. The list below gives the radiation values and the latest determinations of themelting points (where known) of those elements which by reason of their refractorinessmay be regarded as suitable for the anticathode of a focus tube. The physicalproperties of some of them are not convenient, and to others the scarcity andconsequent price are at present an insurmountable objection. Tantalum is now beingused in Rontgen bulbs. Its radiation is rather richer than platinum radiation in softray
The Emission and Transmission of Rontgen Rays . O 50 100 ATOMIC WEIGHT of RADIATOR. tso 200 230 Fig. 6. The list below gives the radiation values and the latest determinations of themelting points (where known) of those elements which by reason of their refractorinessmay be regarded as suitable for the anticathode of a focus tube. The physicalproperties of some of them are not convenient, and to others the scarcity andconsequent price are at present an insurmountable objection. Tantalum is now beingused in Rontgen bulbs. Its radiation is rather richer than platinum radiation in softrays, and it emits about 10 per cent, less hard rays than platinum. It has theadvantage of a much higher melting point, and appears not to harden the tubes somuch as platinum on continued running. All the metals of this group would makeexcellent anticathodes. Generally speaking, the lower the atomic weight the largerthe proportion of soft rays (or, rather, rays not transparent to aluminium) in theradiation. This is especially the case with the metals of the iron group. * J. J. Thomson, <
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