The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14571185358)

Identifier: americanjournalo10ameruoft (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: Internet Archive

Digitizing Sponsor: Internet Archive

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the simplest form is for four. We mayreduce the number of variables in our equa-tion to four by combining milligrams andhours into milligram-hours, and h\ decidingthat we will make a separate chart foreach filtration factor, thus reducing a to aconstant for the special case. In practice,only a few filters are used, and it is more - Quimby. The effect of the size of radium applicators on skindoses. Am. J. Roknh;enol.. October, 1922, A Simple Nomogram convenient to have a chart for each onethan to use the more comphcated nomo-gram for five variables. If we consider the special case ot a filterof 2 mm. of brass and a few mm. ot rubber,in which we are most interested, as the for the Determination of Radium Skin Doses 575 Figure i. The scales AX, BY, AZ, and BT represent skin dose, milligram hours, dis-tribution factor, and distance respectively.The diagonal AB is necessary m using thechart, and the dotted lines represent asolution of the equation, and will be dis- Qto CENTIMETERS 9 8 1 i^

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I __ 10002000 .. 5000 .. fOOO50006000 i 10008000 ■:. 9000JOOOO IIOOO lizooo IZOOO IfOOO .J 5000 -IhOOO .11000 :J 8000 J9000.20000 y O.Z 0.5 0.4 .0.5 ObDISTRIBUTION 0.1 0.8 0.9FACTOR S 1.0 FIGURE I riLTER 3Mn BffAss AND ^.4MM.Rubber I to standard for gamma ray therapy, abecomes 0.009, ^^ o^ equation is J, P^ _ 0.63 X 0.009 X (mg.-hr.) X 5^■^- ~ (cm.)^ The nomogram for this equation, con-structed by the regular method (seeGraphical and Mechanical Computa-tion, by Joseph Lipka) is shown in cussed later. Figures 2 and 3 are similarnomograms for filtrations equivalent to0.5 mm. of brass and 1.2 mm. of rubber,and 0.16 mm. of brass and 1.2 mm. ofrubber (a equals 0.03 and 0.25 respec-tively). The method of using these is as follows:Three of the variables in the equation areknown, and it is desired to find the fourth. 576 A Simple Nomogram for the Determination of Radium Skin Doses Between the values of the two knownquantities which occur on opposite scales—S.D. and mg.-hr., or cm. and 8

The American Journal of Roentgenology Radium Therapy and Nuclear Medicine 1906 Buchillustrationen Röntgen Röntgenstrahlen medizinische Geräte Medizin medizinische Therapie Bilder aus dem Internetarchiv

1906

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