. Journal of radiology . of application theie are several ad-vantages in this method. Utilization ofthe beta radiation produces a verv in-tense local effect. The tubes are heldin place by the tissues and afford anexcellent cross-fire of radiation. Radia-tion is evenly distributed, since thetubes can be buried at any desireddepth; this is especially important inleaching the actively infiltrating baseof a new growth. The slow prolongedradiation permits of greater dosage andis of further significance if malignantcells are more susceptible at the timeof division. The same method can be approxi-mat
. Journal of radiology . of application theie are several ad-vantages in this method. Utilization ofthe beta radiation produces a verv in-tense local effect. The tubes are heldin place by the tissues and afford anexcellent cross-fire of radiation. Radia-tion is evenly distributed, since thetubes can be buried at any desireddepth; this is especially important inleaching the actively infiltrating baseof a new growth. The slow prolongedradiation permits of greater dosage andis of further significance if malignantcells are more susceptible at the timeof division. The same method can be approxi-mated by using thin metal needles con-taining radium salt buried chief disadvantages are the lesseramount of beta radiation obtained, theshorter exnosure, smaller dose neces-sitated and the difficulty of retainingthem in position. We have never had trouble fromthe glass capillary tubes as foreignbodies. In solid tumors they becomeencysted by fibrous tissue excited toformation by the intense radium inflam-. Figure V.—Brass tray clamped inplace on block. mation, while in more friable ulceratinglesions such as are usually found inthe tonsil the majority of them probablyslough out. We have, however, had troublefrom the amount of radium used pertube. In our earlier work with buriedemanation we used tubes of three, fourand even five millicunes each. Theseproduced an unwarranted amount ofsloughing with frequent resultanthemorrhages, to say nothing of theunnecessary suffering on the part ofthe patient. We now feel that tubesof one mc. each 01 thereabouts givebest results. They occasion less slough-ing and pain, and hemorrhage, whichis still a factor to be watched for care-fully in tonsillar work, is much lessfrequently encountered. Tubes ofmuch less than one mc. do not affordenough gamma radiation to be effi-cient, unless a larger number are traumatizes the tissues too carcinoma, one milhcurie of radiumemanation per cubic centimeter oftumor tissue is
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