SUBJECT INDEX 



481 



Thyroxine, paper c-hroiiiatography, 382- 

 383 



studies, 257, 341 342 

 Time of arrival, preeaution in estima- 

 tion, () 

 Tin (Sn*), summary, 315, 451 

 Tissue absorption of beta particles, 02 

 Tissue dose, 442 

 Tissue-equivalent ionization chamber, 



442 

 Tissue-equivalent material, 442 

 Tissue hamlling for autoradiof;iams, 



328-331 

 Tolerance to external radiation, 8(t-'»l 

 Tolerance dose, 442 

 Toxic levels {see individual isotopes) 

 Trace, 442 



Trace chemistry, 442 

 Tracer dose, definition, 60 



isotopic, 442 

 Track, alpha, 341 



beta, 354 



counting, 354-355 



definition, 442 

 Transcapillary exchange {see Exchange) 

 Transfer between phases, 37-39 

 Transient equilibrium, G3 

 Translocation in plants, 6, 344-347 



double-labeling studies, 45 

 Transnnitation, 442 

 Trees, administration of isotopes to, 



151, 289 

 Tritium, summary, 251-253, 448 

 Tumor, 443 



Tungsten (\V*), summary, 31ti, 451 

 Turnover, return of labeled substance, 

 28-31 



simple, 25-28 

 Turnover rate, 26-28 



by appearance of label, 37-39 



by disappearance of label, 25-28 



of fibrinogen, 37 



by maintenance of constant precursor 

 specific activity, 37 

 Turnover time, 26-28 



graphical determination, 37-39 

 Two-carbon acceptor in photosynthesis, 



42-43 

 Two-dimensional chromatograms, 365 



Urine, isolation of radioelements from, 401 

 natural radioactivity, in, 283 



Van Slyke-Folch method for C'\ 163-165 

 Van de Graaff generator, 443 



for radioaetivation analysis, 41!) 

 Vibrating condenser, vibrating-reed 



dynamic condenser, 443 

 Vibrating-reed electrometer, 18(1, 443 

 Vitamin B12, assay by isotope* dilution, 16 



biosynthesis, 44, 240, 241 

 Vitamin D assay with P'^, 47 

 Volume dose, 443 

 Volume ionization, 443 

 Volumes by isotope dilution, 10 



Washing of hands, 99-100 

 Waste disposal, 101-105 



burial, 103 



carbon-14 recommendations, 103-104 



incineration, 102 



radioisotope groups, 102-103 



into sewage, 102 

 Water, absorption of beta particles, 92 



exchange rate from blood, 8 



half-value layers for gamma radiation, 

 94 



isolation of trace metals from, 401-402 



maximum permissible concentrations 

 {see individual isotopes) 

 Water monitor, 443 

 Wet-ashing of samples, 161-162 

 Wet-process autoradiography, 338 

 Window counter {see Counter; Counter 



tubes) 

 Windowless counters, 186 



X rays, 443 



Xanthine oxidase, molybdenum in, 44 



Yeast, autoradiographic study, 252 



lanthanum in, 265 

 Yttrium, carrier effects with, 318 



isolation from urine, 401 



removal rates from plasma, 3(> 



summary, 317-318 

 Yttrium (Y*), summary, 317-318, 451 



Units of radioactivity, 86 

 Unstable, 443 



Urinals (see Collection of excreta) 

 Urine, collection iscf Collection of 

 excreta) 

 direct counting or plating, 187-188, 

 224, 235, 268-269, 300, 307, 317 



Zinc, sumnuiry, 319-321 



Zinc uranyl acetate reagent, 372 



Zinc (Zn^*), in vivo usage, 5 



summary, 319 ;V21, 451 

 Zirconium, sununary, 322 323 

 Zirconium (Zr*), summary, 322-323, 451 

 Zirconium (Zr'*) as insect label. 3 



