INDEX 



645 



Chlorine, in biological tracer studies, 523, 

 542, 547 



isotopes of, 15, 191-192 

 Chromium, in biological tracer studies, 531, 

 547 



isotopes of, 16, 195 

 Clipping circuit, 332 



Cobalt, in biological tracer studies, 528- 

 529, 543, 547 



isotopes of, 16, 196-197, 528 



in radiotherapy, 541, 550 

 Coincidence circuits, 335-336 

 Coincidence corrections, for counters, 323- 



325, 363 

 Coincidence counters, 44 

 Coincidence counting corrections, 325-326 

 Collision (See Scattering) 

 Colloids, in radiotherapy, 540 

 Columbium, in biological tracer studies, 

 532, 543, 548 



isotopes of, 17, 211-212 



in radiotherapy, 540, 550 

 Compton effect, 32-33, 36-39 

 Compton scattering, 419 

 Contamination by radioactive substances, 

 450-459 



of air, 465-466 



in dry ashing, 446, 448 



of surfaces, 466 



survey instruments for, 164-168 



tolerance levels for, 465-467 

 Copper, in biological tracer studies, 527— 

 528, 543, 547 



isotopes of, 16, 198-199, 527 

 Coulomb energy, 8 

 Counter discharge, 328 

 Counter efficiency, 326-327, 362-364, 367, 



372-373, 377 

 Counter gas pressures, 316 

 Counters, for fast neutrons, 316-318 



Geiger-Miiller, 304-340 



non-self-quenching, 304-307, 327 



self-quenching, 307-308, 311, 327 



for slow neutrons, 316-317 

 Counting circuits, 346 

 Counting rate meter, 336-339 

 Critical energy, for fission, 149 

 Cross section, for fission, 149 



at resonance, 149 

 (See also Neutrons) 



Curie, unit of radioactivity, 169-170, 358- 



359 

 Cyclotron, 476-488 



ion sources for, 482 



184-inch, 478-479 



resonance frequency of, 477 

 Cyclotron target, construction of, 483-484 



efficiency of, 485-486 



materials for, 484-486 



types of, 483 



D 



Dead time, of counters, 308-309 

 De Broglie wave length, 77, 122, 125-126 

 Decade counting circuits, 331, 333i 

 Decay scheme, 43-44, 171-176, 185, 358, 

 362-365, 424 



of UX 1? 366 



of various isotopes, 172-175 

 Decay time, of amplifiers, 294, 338 

 Decontamination, 453 

 Delayed neutron, 155, 159 



periods of, 159 

 Delta rays, 90 

 Density, of H 2 and D 2 0, 265-267 



of neutrons, 131-134 



of radioactivity in tissue, 417, 423, 431- 

 434 

 Detection, of ionization, in ionization 

 chambers, 351-355 



of radioisotopes, 511 

 Deuterium, methods for measuring, 263- 

 278 



in tracer studies, 516 

 Deuterium analysis, by diffusion gradient, 

 275-276 



with falling drop, 272-275 



with free float, 271-272 



with the pyenometer, 269-271 



by refractive index, 269 

 Deuterium oxide, properties of, 263-267 

 Deuterons, 76-116 



properties of, 76 



in radiotherapy, 541 

 Deuteron range, 89 



in air, 114 



in aluminum, 115 



in lead, 116 

 Diffusion, of neutrons, 130-135 



