File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14754024621).jpg

Identifier: americanjournroen09ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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on. Therefore, if a beam of highx-ray is passed through a port of given size,the difference between the surface dosageand that 4 cm. below the skin will not be asgreat as where radium is applied directlyto the skin. In the case of radium it can beeasily seen that there is an enormous sur-face dosage, while 4 cm. below it is compara- The Superficial Reaction of Radium as a Guide to Dosage 37 tively small. In the treatment of superficialconditions this factor is the most importantone. The diseased condition receives anenormous dose while the sound tissuesunderlying the lesion receive comparativelylittle radiation. If the lesion penetrates to some depthand a deeper radiation is required, then The small amount of damage done bythe secondary radiation is scarcely negligi-ble, and the judicious use of distance willto a great extent set aside all local surfaceirritation. The distribution of the radiating mate-rial must also be taken into consideration.The effect of a large tube containing 50
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Fig. 3. Shows results from ioo mg. for two hoursl, 50 nig.for four hours, 25 mg. for eight hours. Radiumelement filtered by 1 mm. lead, 2 cm. wood. Threeweeks after application. the radium should be elevated and the timeincreased in proportion. But should thiselevation be more than i or 2 cm. otherfactors must be considered. In those casesin which the cross-fire treatment isadopted the radium should be elevated1 or 2 cm. from the skin; and while someauthorities have expressed the belief thatradium is not effective beyond 2 cm., yetin the number of cases of carcinomata ofthe larynx, the only ones living to-daywithout manifest evidence of disease werethose treated by this method. Others,where there was a direct application to thelarynx or by needles inserted into thegrowth, failed to respond. Intense local reaction has been attrib-uted to secondary radiation; but there isnot the least doubt that most of this irri-tation is simply due to the relatively highsurface dosage. Fig. 4. Result

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