. Radiography, x-ray therapeutics and radium therapy . ven, or preferably a specimen submitted to befitted to the instrument. The area of pastille exposed to the action of therays should be of such a size that on looking down the instrimient none of theunchanged green colour should be visible. Therefore those holders that onlyexpose half of the pastille should not be used. The actual aperture which 19 290 RADIATION THERAPEUTICS controls the amount of pastille exposed to view can be varied to suitrequirements. The examination should be made rapidly, as the pastille fades even inelectric licfht.
. Radiography, x-ray therapeutics and radium therapy . ven, or preferably a specimen submitted to befitted to the instrument. The area of pastille exposed to the action of therays should be of such a size that on looking down the instrimient none of theunchanged green colour should be visible. Therefore those holders that onlyexpose half of the pastille should not be used. The actual aperture which 19 290 RADIATION THERAPEUTICS controls the amount of pastille exposed to view can be varied to suitrequirements. The examination should be made rapidly, as the pastille fades even inelectric licfht. The Epilation Dose.—When new pastilles are used, the standard for 1 Ballows a 20 per cent margin of error on either side, -^ nearly always epilatesand 11 B is nearly the absolute hmit of safety for unfiltered rays. For quiteaccmate work new pastilles should always be used. The tint of a used andbleached pastille can always be compared with the standard ; if it is definitelymore yellow than this it should be discarded in any case. The daylight.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1915
