The Effect of Different Radiation ‘Depth-Dbose Curves on Mortality in and in Mammals ose Tullis et al. (35, 36) has studiea this in the laboratory and in the which te atomic bomb field This is target animals. the tests with swine as illustrated in Figure 10, showing the sigmoid dose mortality curves for hould be ete LHVES unilateral 2000 kVp x ray, bilateral 2000 kVp x ray, and the mortality from 2G the highly energetic prompt gamma radiation from a fission bomb. lout field from unilateral 2000 kVp x ray is 500 rad in air. ‘ces resulted in an LUs 9 of 400 rad in air. OF the 5 a radiation with LDso was about 230 trad in air. n is better -adiation to a homogeneity kVp x ray, 7 rget sf fe sortant ta ne bone Narrow” in distribution of dose. o ms the surface eA galis off °% the body in to in the case of the unilateral 2000 In the than 300 rad case of tissues proximal to and distal from the midline In the case of the prompt gamma tissues proximal to the midline receive a greater dose and those distal a lesser dose, and hence a higher and lower survival of hemopotetic is 4 ie marrow converted tissues distal from the midline received much less pilateral 2000 kVp x ray, radiation, important These air doses can be and tissues proximal to the midline received more. air dose. in the midling The initial bomb gamma radiation The differences are explained in part by lack of receive a greater absorbed dose. this Bilateral 2000 kVp midline tissue doses based on comparative studies on depth-dose curves to 300, 220, and 184 rad. gughout The LDso i: . e ster. cells on opposite ‘ As a result of sides of the midline. the effect of energy and peometry ot expusure, measured radiation doses in air are of relatively little use in predicting * survival. we For practical clinical management, it is the opinion of this “author that one should be guided by the clinical and hematologic cource av’ a Fi a by estimates of radiation doses in air or doses estimated by biological “dosimetry. Fallout Kaaiation Exposure of the Marshallese The energy of a fallout field determines, in addition to the geometry exposure, the depth-dose pattern. 9 4-day old fallout. Figure 11 shows the. energy spectrut: The original source is the energy of sSions frou the major components of the 4-day fallout. inherent yauma The solid hlack Stogram is calculated distribution of energy taking into account Compton ttering. Thus the energy to which an individual is exposed varies from rgucld keV with little penetration to a peak at 1600 KEV. The effect of ea energy distribution in the geometry of exposure on depth-duse curves e shown in Figure 12. The depth-dose curves of a fallout field and ~103-