474 



RADIOISOTOPES IN BIOLOGY AND AGRICULTURE 



Labeled compounds, definition, 435 

 with iodine 131, 258-259 

 with sulfur 35, 309 

 with zinc 65, 320 

 Laboratory animals, colony specifica- 

 tions and management, 12(3-129 

 conditioning to experiment, 126 

 oral dosage, 141-142 

 parenteral dosage, 144-146 

 management requirements, 129 

 (See also specific animals) 

 Laboratory design, general features, 114- 

 115 

 general specifications, 118-121 

 Laboratory equipment (see Equipment; 



Instrumentation) 

 Laboratory floor plans, 115 

 for farm animals, 118-119 

 one-room, 116 

 six-room, 118 

 two-room, 117 

 Laboratory needs for autoradiography, 



Lanthanum, summary, 265 

 Lanthanum (La*), summary, 265, 449 

 Latent period (radiology), 436 

 Latent tissue injury (radiology), 436 

 Lauritsen electroscope, 436 

 LDso dose (see Median lethal dose) 



for various species, 90 

 LDso time (see Median lethal time) 

 Leaching in autoradiograms, 329 

 Lead, half-values for gamma radiation, 



94 

 Lead cobaltinitrite reagent, 370 

 Lead equivalent, 436 

 Leaves (see Plants) 

 Length of plateau, 436 

 Leukemia, 436 

 Lifetime, 436 



Lindemann electrometer, 436 

 Linear absorption coefficient, 436 

 Linear accelerator, 436 

 Linoleum decontamination, 101 

 Liquid counting, 187-188 

 Liquid emulsion, 336-338 

 Logarithmic behavior, 19 

 Losses, counting, 175 



in drying, 160, 295 



(.See also Ashing; individual isotopes) 

 Lymph, 436 

 Lymph node, 436 



Lymph space, determination of, 11 

 Lymphocyte, 436 

 Lymphopenia, 436 



ALalonic acid, isotope effects with, 78 

 Manganese, summary, 266-267 



Manganese (Mn*j, summary, 266-267 



449 

 Mass in tracer studies, 59-61, 318 



(See also Self-absorption) 

 Mass absorption coefficient, 436 

 Mass number, definition, 1 

 Mass spectrograph, 436 

 Massive dose, definition, 60 

 Maximum permissible levels, external 

 radiation, 89-91 

 internal radiation, 96-98 

 (See also individual isotopes) 

 Mechanical register (counting), 436 

 Median lethal dose (MLD), 436 



for various species, 90 

 Median lethal time (MLT), 436 

 Mercuric nitrate-ammonium sulfide 



reagent, 371 

 Mercury, summary, 268-269 

 Mercury (Hg*), summary, 268-269, 449 

 Mercury-diuretic removal rates from 



blood, 36 

 Metabolism cages for collection of radio 

 active excretions (see specific ani- 

 mals) 

 Metal decontamination, 101 

 Mice, administration of isotopes, 140- 

 142, 144, 146-147 

 blood collection, 147-148 

 management requirements, 129 

 measurement of whole animal, 303 

 metabolism cages, 129-131 

 radiation effects from isotopes, 67 

 Microcurie (^c), definition, 86, 437 

 Milk, copper determination, 400-401 

 counting of P^^, 279 

 mineral analysis, 400 

 xanthine oxidase and Mo^^ from, 44 

 Millicurie (mc), definition, 86, 437 



relation to millirocntgens, 93 

 Million electron volts (mev), definition, 



84, 437 

 Milliroentgen, definition, 87-89, 437 



relation to millicuries, 93 

 Minimal detectable activity (MDA), 

 definition, 174 

 instrumental details, 202 

 (5ee also individual isotopes) 

 Mixtures, radioisotope (see Radio- 

 isotopes) 

 Mole fraction, 437 

 Molybdenum, summary, 270-271 

 Molybdenum (Mo^^), summary, 270- 

 271, 449 

 in xanthine oxidase, 44 

 Monitoring, 437 



instrumentation, 105-106 

 Monkey management requirements, 129 



