. Radiography and radio-therapeutics . ers may be left in situ for about fifteen hoursfor an exposure. This may be repeated in amonths time. The radium tube is enclosed inrubber tubing 2 mm. thick. This is introducedinto the lumen of the bowel, and the length ofrubber is strapped outside, serving to hold theradium tube in position. A soft rubber catheterwill be found an excellent holder for the radiumtube. A thin rubber tube placed over this oneand sealed at one end serves the double purpose ofa filter and of keeping the radium tube clean. Ina number of cases it will be possible to pass a long
. Radiography and radio-therapeutics . ers may be left in situ for about fifteen hoursfor an exposure. This may be repeated in amonths time. The radium tube is enclosed inrubber tubing 2 mm. thick. This is introducedinto the lumen of the bowel, and the length ofrubber is strapped outside, serving to hold theradium tube in position. A soft rubber catheterwill be found an excellent holder for the radiumtube. A thin rubber tube placed over this oneand sealed at one end serves the double purpose ofa filter and of keeping the radium tube clean. Ina number of cases it will be possible to pass a long flexible tube from therectum through the lower opening of a colotomy wound, when several tubesmay be introduced and applied to the whole of the canal affected by thegrowth. In this way a thorough exposure may be obtained at one treat-ment. During the exposure the tube containing the radium tube can bemoved several times upwards and downwards, so as to ensure an equaldistribution of the radiation over the entire surface of the Fig. 397.—Diagram to illus-trate method of introduc-ing radium tubes into lowerbowel. The dark lines represent theradium tubes, the shaded areasthe growth. The radiumtubes are enclosed in a longrubber tube. RADIUM IN CANCER 537 In Cancer of the Prostate Gland This may be treated by four methods : (1) By the rectum. (2) By tubes introduced into the bladder. The tube is enclosed in acatheter. (3) By a number of tubes introduced into the substance of the perineal route may be employed. (4) Post-operative treatment. Tubes can readily be introduced intothe bladder after operation. When treating by method No. 1 radium should be filtered through2 mm. of platinum. Comparatively long exposures may be given, up totwelve to fifteen hours, using 100 mgrms. of radium. No. 2.—This does not allow of very thick filters, therefore the exposuresmust be reduced proportionately. By method No. 3, provided the tubes can be quite surrounded by thegrowth,
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