Identifier: americanjournroen08ameruoft (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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ole system. Naturally we cannot simu-late this in physical experiments. Hence, inorder to make practical application of the Absorption of Radium Radiation by Tissues 217 results obtained from physical experiments,it is necessary to conduct physiological ex-periments complementary to the former. EXPERIMENTAL PROCEDURE To determine the absorption of radiationby tissue it was necessary to have uniformparallel slices of tissue about 5 cm. square.The thicker slices were cut by hand, usinga knife with a wide blade. The thin slices case of a very soft tissue, because its weightflattened the bottom layers. The density ofthe tissue was determined as follows: Thetissue, in one or several pieces, was weighedwith an accurate balance. Its volume wasthen determined by measuring the amount ofwater which it displaced, and the densityobtained by dividing the mass by the volume.The weight of the tissue used for this de-termination was in every case several hun-dred srrams. For the metals and solid bone
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Fig. I. Projection of Go/dLeaf on Grounol Glass Screen were cut by means of a meat-slicing machinewith a specially ground knife, after the tissuehad been frozen hard. Tissue hardened informalin could be cut with this machinewithout trouble. The thickness of the slicesof tissue was determined by placing eachbetween two thin sheets of lead and measur-ing the total thickness with a micrometercaliper. When the thickness of tissue on themica support was several centimeters, thetotal thickness was checked by placing asteel scale against the pile of tissue. Thisprocedure was especially necessary in the the volume was calculated from the dimen-sions of a rectangular slab of the material.The source of radiation used for theseexperiments was radium emanation enclosedin capillary glass tubes about 0.5 mm. in out-side diameter and 14 mm. long. While thewall thickness of these tubes is sufficientlygreat (about o.i to 0.15 mm.) to absorb thealpha rays, it has little effect on the beta andgamma radi

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