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File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14570669910).jpg

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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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., this factor is 0.685. The factorfor the circle 3 cm. in diameter at a dis-tance of 2 cm., filter 0.16 mm. brass and1.2 mm. of rubber, is 6.42. Therefore forthe same dose the circle would produce 77: or 0.4 times the effect. But since0.685 the same effect is desired, we must decreasethe close from the circle; it should be or 26.6 millicurie-hours.9.4 Suppose we wish to compare the inten-sity of radiation on the skin from a doseof 500 millicurie-hours given with a circularapplicator 3 cm. in diameter, filter 0.5 mm.brass and 1.2 mm. rubber, distance 2 cm.with that from a dose of 2000 millicurie-hours from a rectangular applicator 4 x6 cm., filter 2.0 mm. brass and 2.4 mm.rubber, distance 4 cm. The factor for thefirst is 0.48 (assuming the 3 cm. appli-cator to have the average of the 2 and 4cm. ones). Since this is per unit of dose, 678 The Effect of the Size of Radium Applicators on Skin Doses Table IIIB_ Applicators with filter 0/0.16 mm. brass, and ,.2 mm. rubber Circles—Diameter
Text Appearing After Image:
0.25 11 -;ii ii 751 11 1 5 2.0 3-0 6 Cm. 8 Cm. Rectangles—Lengths of Sides Cm.1 X 1.5 76.056.8 3S 426 )14 4X S44.20 Cm.2X4 20. 5(9 117-314.29.606.723 60 Cm.4X6 Cm. Cm. 6X9 8 X 12 92 42820I I03 28 44 ;•28221908 Cm. 10 X 15 11 -;0.920.860 H.i,1 780 811 — 10 Cm. 10.2 5.76 3.20 1 07 8 64 4.00 2 56 1 78 8.40 3.85 2.35 1 50 784 3-72 2.16 1 40 6.24 3 48 2.10 1 37 -; 4 3 114 1 96 1 55 3.08 2.24 44 17 or, in other words, per millicurie-hour,this must be multiplied by the dose:O.48 \ J00 = 240. Similarly, for the rec-tangle the factor is 0.045. Multiplyingthis by the dose we have 90.0. Theretorc 2 1() the Inst applicator would gn e -^ or 2.7 times as intense radiation on the skin asthe second. It should lie noted that in these curves.111,1 tables the decrease in intensity olradiation given is due to increase in distance alone. If it is desired to considerthe effect within the body, then thedecrease due to absorption by tissueenters, and proper allowance must bemade for this. At th

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  • bookid:americanjournroen09ameruoft
  • bookyear:1906
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:American_Radium_Society
  • bookauthor:American_Roentgen_Ray_Society
  • booksubject:Radiotherapy
  • booksubject:X_rays
  • bookpublisher:Springfield__Ill__C_C__Thomas
  • bookcontributor:Gerstein___University_of_Toronto
  • booksponsor:University_of_Toronto
  • bookleafnumber:701
  • bookcollection:gerstein
  • bookcollection:toronto
  • bookcollection:medicalheritagelibrary
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InfoField
27 July 2014

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