SUBJECT INDEX 



479 



Rf, in paper rhromatography, 3G2 

 for radioisotopes, 93 

 (See also individual isotopes) 



Rhenium (Re*), summary, 28S, 449 



Roentgen, definition, 87-89, 440 

 in terms of biological response, 90 



Roentgen-equivalent-man (rem\ defini- 

 tion, 88 



Roentgen-equivalent-physieal (rep), 



definition, 88 

 Roentgen rays (see X rays) 

 Rooting-patterns study, P'^ in, 50-51 



procedures for, 154 

 Roots, ion-absorption studies, 152 



P32 accumulation in, 346-347 

 Rubidium, summary, 289-290 

 Rubidium (Rb*), summary, 289-290, 



449 

 Rules for radiochemical and chemical 



laboratories, 108-111 

 Ruthenium, summary, 291-292 

 Ruthenium (Ru*) summary, 291-292, 



450 

 Rutherford (rd), 86-87 



Safe handling of radioisotopes, lab- 

 oratory rules, 108-111 

 Salt estimation by ion exchange, 404- 



406 

 Samarium (Sm*), summary, 293, 450 

 Sample preparation for counting, bri- 

 quet formation, 172, 210, 280 

 carbon-14 methods, 224-226 

 centrifugation, 170-171 

 direct method, 238, 306-307 

 electroplating, 171 

 evaporation, 167 

 filtration, 169 

 freezing of eggs, 215 

 Samples, ashing, 160-167 

 dry-, 162-163 

 pseudo wet-, 160 

 wet-, 161-162 

 collection, 159 

 drying, 159 



oxidation for C'\ 163-167 

 Sarcoma, 440 

 Saturation, 440 

 Saw for bones, 333 

 Scaler (scaling circuit), 440 



operation, 184-185 

 Scaling factor, 440 

 Scandium (Sc*), summary, 2'.)4, 450 

 Scanning device for paper chromato- 



grams, 368 

 Scattered radiation (in radiology), 440 

 Scavenging, 440 

 Scintillation, 440 



Scintillation counter, 440 

 Scintillation counting, 188-189 

 in vivo, 192-195 



secondary radiation importance in, 

 188 

 Scintiscanner, in vivo counting, li)3 

 Secondary radiation, 441 



importance in scintillation counting, 

 188 

 Secular equilibrium, 63 

 Selective localization (isotopes), 441 

 Selenium, summary, 295-296 

 Selenium (Se*), summary, 295-296, 450 

 Self-absorption, of beta rays, 177-183 

 for calcium 45, 180 

 constant-activity method, 179-180, 



298 

 constant specific-activity method, 



178-179 

 definition, 441 



effect on C^^ counting, 225-226 

 empirical relationships, 181 

 explanation of values, 202 

 infinitely thick samples, 182 

 standard-thickness method, 181 

 thin-sample method, 181 

 Self-quenched counter tube, 441 

 Self-scattering, 441 



Sensitive volume (in radiobiology ), 441 

 Sensitivities, for carbon 14, 225 

 of counters, 174 



{See also individual isotopes) 

 of radioactivation analyses, 415-418 

 Separations by ion exchange, 402 

 Serum, base estimation in, 406 



(See also Plasma) 

 Sewage disposal of active wastes, 102 

 Sheep, administration of isotopes, 139- 

 144, 145-146 

 blood collection, 148 

 metaboKsm procedures, 136 

 vitamin B12 biosynthesis, 44 

 Shield, 441 



Shielding, barriers, 95-96 

 for beta particles, 92 

 calculations, 92-94 



(See also individual isotope sum- 

 maries, Rf /mc values) 

 close, 94-95 

 for gamma rays, 92-96 

 half-value layers, 94 

 materials data, 94 

 syringe shields, 141 

 Shoot-tips, radiation injury, 69-70 

 Silage, sulfur-35 studies, 309-310 

 Silver, removal from palladium, 277 



summary, 297-298 

 Silver nitrate reagent (ammoniacal), 372 



