. Journal of roentgenology . McCANDLESS — DIAPHRAGMATIC HERNIA. A SIMPLE SLIDE RULE FOR COMPUTING X-RAY EXPOSURE* ONE PLATE By Millard B. HodgsonResearch Laboratory, Eastman Kodak Co.• Rochester, N. Y. In a recent paper by Millard B. Hodgson, he outlinedihe fundamental factors entering into x-ray exposure anddeveloped a formula for expressing these factors arithmeti-cally, so that exposure could he computed easily. Theformula developed was as follows: ,_. .. , . Distance2 (in inches) xSpark FactorX Absorption Factor Time (in seconds)= ■ — ; :——: K (constant of plate) X current in M. A. or P^xS
. Journal of roentgenology . McCANDLESS — DIAPHRAGMATIC HERNIA. A SIMPLE SLIDE RULE FOR COMPUTING X-RAY EXPOSURE* ONE PLATE By Millard B. HodgsonResearch Laboratory, Eastman Kodak Co.• Rochester, N. Y. In a recent paper by Millard B. Hodgson, he outlinedihe fundamental factors entering into x-ray exposure anddeveloped a formula for expressing these factors arithmeti-cally, so that exposure could he computed easily. Theformula developed was as follows: ,_. .. , . Distance2 (in inches) xSpark FactorX Absorption Factor Time (in seconds)= ■ — ; :——: K (constant of plate) X current in M. A. or P^xSfXAfKXM. A. As stated in the paper in question, the writer did notoffer this formula as a rigid form of technique since thespecial considerations of individual cases often have con-siderable influence on the method of procedure. The generalresults obtained from the use of this formula, however, inthe hands of relatively untrained workers in the ResearchLaboratory were such that it was used altogether after awhile as a standard guide in exposing for
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradiolo, bookyear1919
