. The American journal of roentgenology, radium therapy and nuclear medicine . doses, as seen in Figures i and 2 we gain from the researches of aphysicist a correct idea of the actual intensi-ties of radiations. The therapeutic applica-tion of these values has been worked out bv. Fig. I. Curves of Isodoses of a Radium Capsuleof a length of about 3 cm. [Friedrich]. Fig. 2. Curves of Isodoses of Three Radium Capsulesof a total length of about 9 cm. [Friedrich]. Relation of Physics to Radiation Therapy 289 Opitz and Friedrich. The iontometer ex-presses radiation values in electrostatic
. The American journal of roentgenology, radium therapy and nuclear medicine . doses, as seen in Figures i and 2 we gain from the researches of aphysicist a correct idea of the actual intensi-ties of radiations. The therapeutic applica-tion of these values has been worked out bv. Fig. I. Curves of Isodoses of a Radium Capsuleof a length of about 3 cm. [Friedrich]. Fig. 2. Curves of Isodoses of Three Radium Capsulesof a total length of about 9 cm. [Friedrich]. Relation of Physics to Radiation Therapy 289 Opitz and Friedrich. The iontometer ex-presses radiation values in electrostatic units,shortly designated by a small e. If a cap-sule of radium containing 30 mg. elementfiltered through mm. of brass and 5 celluloid is applied to the skin at a dis-tance of cm. the application to producenecrosis of the skin must be extended toseventy hours, , 2100 mg. e hrs. Thismeasures 300 e. Hence 7 mg. e hrs. wouldequal i e. If we refer to the tables and figures ofisodoses, we see that, if a 50 mg. radium ele- fore give isodoses as indicated above and weat once know the exact intensities that maybe obtained in any part of the true pelvis. The question arises, How may we applythese results in therapy? Obviously a bio-logic unit of dose must first be ascertain
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