1246 



RADIATION BIOLOGY 



Leukemia, in relation to myeloid hyper- 

 plasia, 1164 

 reticulum cell, 1167 

 thymic, 1164 

 Leukemogenesis, by atomic bomb, 1163 

 effect on, of adrenalectomy, 1165 



of cortisone, 1188 

 in dogs, 1164 

 dose rate, 1166 

 factors of, 1165 

 indirect mechanism, 1165 

 Leukocytes, 922-923, 930, 935, 960, 964- 

 965, 977 

 abortive rise in, 1035, 1036, 1043, 1044 

 after exposure to fast neutrons, 1043, 

 1044 

 acute-radiation effects, 1031-1036 

 and cutting of distal vessel of spleen, 



1070 

 of fast neutrons, 1033, 1042-1044 

 of gamma radiation, 1049-1053, 



1055-1056 

 of radioisotopes, 1056-1061 

 of X radiation and fast neutrons, 

 1033 

 adherence to blood vessels, 977 

 morphological changes in, 1062, 1063 

 polymorphonuclear, 930 

 Leukocytosis, 964 

 Leukopenia, 922, 923 

 Lewisite, 551 



(<See also Mustard gas) 

 Liberation of H 2 S, from cysteine, 267-268 

 pH dependence of, 267 

 from glutathione, 267 

 Life span, decrease in, 337 

 of mammals, 922 

 shortening of, 1005n. 

 Light, 3, 14 



absorption coefficient of, 118 

 infrared, definition of, 20 

 penetration of, 118 

 primary action of, 74 

 production of, 21 

 ultraviolet, definition of, 20 

 visible, definition of, 20 

 Light effects, characteristics of, 84 

 Linear accelerator, 12 

 Linear energy absorption, 316 

 Linear energy transfer, definition, 316 

 Linkages, 356 

 ester, 290 

 gene, 638, 642 

 glycosidic, 290 

 Lipids, of adrenal cortex, 990 



of plasma, 974-975 

 Liquid solutions, 229-233 



Litter size, 826, 830-840, 843, 848, 849, 

 855 



from females irradiated during preg- 

 nancy, 866, 870-874, 890-891 

 Liver, 306, 1128 



blood flow, 977-978 



carcinogenesis in, 1157, 1160, 1184 



irradiation of, 978, 982, 986-988 



effects of shielding, 1070, 1072, 1073 



plutonium and, 1128 



regeneration of, 1128, 1135 

 and radiosensitivity, 929 



retention of colloids, 979, 988 



sensitivity of, to prenatal irradiation, 

 880, 886-889, 896-898, 902, 904 



thorotrast, 1128 



uric acid of, 988 



yttrium and, 1128 

 Liverwort, 531 

 Local irradiation, 1136 



vs. total-body irradiation, 1091 

 Loci, 356 



duplicate, 455 



groups of, 454 

 Locust, 358, 385 



Loss of elastic fibers in skin, 1122 

 Lotus, 583 

 Luminescence (see Fluorescence and 



phosphorescence) 

 Lung, 1129 



bronchial epithelium, 1130 



carcinogenesis in, 1153, 1157, 1160, 

 1177-1180 



latent period in, 1129 



relative radioresistance of, 1129 

 Lupin, 567 

 Lyeopersicum, 776 

 Lymph, constituents of, 972-976 



extravasation of red cells, 966, 968, 971, 

 979 



flow of, 970 

 Lymph nodes, 960-966, 1101, 1103, 1104 



effect on, of fast neutrons, 1104 

 of repeated X irradiation, 1104 

 of slow neutrons, 1104 

 Lymphatic organs, 1101 



edema of, 1103 



involution, 991 



latent period, 1104 



Peyer's patches, 1101 



radioactive isotopes and, 1104 



regeneration of, 1103 



solitary lymphatic nodules, 1101 



spleen (see Spleen) 



tissue, 1101 



tonsils, 1101 

 Lymphatic vessels, dilatation of, 976 



