SUBJECT INDEX 



1257 



Radioresistance, of macrophages in bone 

 marrow, 1100 

 of reticular cells, 1133, 1135 

 Radiosensitivity, 1133 

 alteration of, by combined measures, 

 1079, 1080 

 by prophylactic measures, 1064-1068 

 by therapeutic measures, 1068-1077 

 by tissue shielding, 1068-1073 

 biological factors, 927-934 

 and cellular environment, 1135 

 of chromosomes, 721, 741, 748 

 of cold-blooded vs. warm-blooded 



vertebrates, 1093 

 dependent on developmental stage, 

 861-862, 867-868, 874-877, 879- 

 882, 906-907, 909, 911 

 differential, of parts of embryo, 862, 

 889, 892, 899-900 

 (See also Critical periods for induc- 

 tion of abnormalities by prenatal 

 irradiation) 

 effect of induced hyperplasia on, 1064- 



1066 

 experimental modification of, 927-934 

 induced, 934-944 

 of organs, 1135 

 physical factors, 927-934 

 recovery in, 928 

 in relation to water, 754 

 relative, 1092, 1094, 1132 

 Radiothyroidectomy by I 131 , 1171-1172 

 Radium, 390, 391 



anemia induced by, 1059 

 calcification of vessels by, 1122 

 effect of, on adrenal gland, 1132 

 on bone, 1110-1112 

 on cartilage, 1113 

 on intestine, 1127 

 on peripheral blood, 1059 

 on ovary, 1118 

 on skin, 1122 

 on spleen, 1107 

 on testis, 1117 

 and mutations, 478, 581 

 toxicity of, 1000 

 Radium workers, leukemia among, 1162 



tumor incidence in, 1158, 1182-1183 

 Radon sources, 321 

 Raman effect, 46 

 Rana, 802 



Rana spermatozoa, 643 

 Randomness of atomic events, 26 

 Range, 87 



extrapolated, 100 



maximum, 100, 102 



relative, of electrons and photons, 111 



true, 92, 100 



Rate of energy loss, 316 

 Rats, 774, 776, 781, 805, 806, 808, 809, 

 811, 812, 816, 825, 827, 831-835, 837, 

 848, 863, 907 

 baby, LD 50 for, 931 

 broad developmental divisions of, 863 

 carcinogenesis in, 1152, 1157, 1159, 



1164, 1172, 1174, 1180, 1184 

 carcinoma in, 684 



irradiation of, during fetal period, 893- 

 894, 896-898 

 during period of major organogenesis, 

 869, 872-874, 876-888, 891-892, 

 901 

 during preimplantation period, 864- 

 866 

 LD 60 for, 930-931 

 sarcoma in, 693 

 Reactor, nuclear, 14 

 Reciprocity, 924 

 Recombination, 355 



of ions, 194n., 239-240 

 Recovery in radiosensitivity, 928 

 Red cells, 960-961, 970, 974, 979, 1002 

 nucleated, 305 

 (See also Erythrocytes) 

 Red pulp of spleen, 1106, 1108 

 Reduplication of organs, 325, 335 

 Refractive index of plasma, 972 

 Regeneration, 459, 1135 



of blood-forming tissues, 963-964 

 of bone marrow, 1101 



hematopoietic cells, 1100 

 capacity for, and type of radiation 



damage to embryo, 902 

 of epidermis, 1121 



following injury from prenatal irradia- 

 tion, 880, 888 

 inhibition of, 335 

 of liver, 1128, 1135 

 of lymphatic tissue, 1103 

 of spleen, 1106 

 Regression of tumors, 325, 339 

 Regulatory powers of mammalian blasto- 



meres, 868, 904 

 Relative biological effectiveness, 321, 



322, 328-342 

 Relative radiosensitivity, 1092, 1132 



nucleus and cytoplasm, 1094 

 Relaxation, electric, 69 

 Relaxation length, 104 

 Relaxation time, 76 

 Rem (roentgen equivalent mammal), 



1147 

 Remodeling of bone, 1112 

 Renal failure, 925 



Rep (roentgen equivalent physical), 1147 

 Repair of bone, 1111 



