SUBJECT INDEX 



Aberrations, lenses, 347, 349-50, 374 

 Abramson cell, 282-284 

 Absorption, self-absorption by radio- 

 isotopes, 627-30 



X-ray, 458-61, 465-6 

 Absorption coefficient, 423-5. See also 



Extinction coefficient. 

 Absorption estimation (light), 438-45 

 Absorption laws (light), 422-5 

 Absorption spectra, carotinoid pig- 

 ments, 420 



7-dehydrocholesterol, 447 



light, 420-30 



living systems, 427-8 



measurements, 425-7 



nucleic acid, 446 



porphyrins, 420 



protein, 446 



rhodopsin, 433 



scattering materials, 428-30 

 Absorption spectrophotometry, 426-7 

 Abundance ratio (isotopes), 562, 589 

 Accuracy, isotope measurements, 586- 

 9, 623-30 



research, 29 

 Acetone, mass spectrum, 570 

 Achromatic objectives, 349-51 

 Acoustic resistance, 303 

 Acoustics, 301-42. See also Ultra- 

 sonic vibrations. 

 Action potentials, 259-62 

 Action spectra, 431-47 



antirachitic action, rats, 447 



interpretation, 440-7 



killing bacteria, 431, 446 



killing fungus, 446 



various biological phenomena, 431 

 Adiabatic calorimeters, 184 

 Adiabatic method (calorimetry), 186-7 

 Afterperiod (calorimetry), 194-5 

 Airy disc. 345 



Alpha particles, 491 ff. See also 

 Ionizing radiations. 



dose rate, 535, 545-6 



ion density, 502-4 



sources, 535-7 

 Alpha rays. See Alpha particles. 

 Aluminum, penetrability by beta rays, 



602-3 

 Amoeba, viscosity studies, 120, 126 

 Amplifier(s), capacitor-coupled, 254-5 



direct current, 250-4 



electrometer, 249-50 



electronic, 248-58 



limitations, 255-8 



in mass spectrometry, 575-7 



power supplies, 257-8 

 Angstrom unit, 383 

 ^Animal calorimetry, 200-3 

 Aperture, numerical, 345-7, 410 

 Apochromatic objectives, 350-1 

 Arcs, carbon, 373 



mercury, 352, 433-4 



zirconium, 373 

 Artifacts, desiccation, 410-12 

 Attenuation coefficient, 430 

 Autoradiograph, 369, 636-8 



B 



Background count (radioactivity), 



624-5 

 Bacteria, preservation, 215, 228-9 

 Bacteriophage, preservation, 216 

 Beckmann thermometer, 136, 139 

 Beer's law, 423-4 



deviations from, 428 

 Bernstein's hypothesis, 264 

 Beryllium targets, 528-31 

 Beta particles. See also Electrons and 

 Beta rays. 



mean energy, 524-5 

 Beta rays, absorption in aluminum, 

 602-3 



danger from, 497, 521 



penetrating power, 520-2 



655 



