SUBJECT INDEX 



375 



Vitamin D, 163 

 Vitreous humor, 109, 118 



Water, opacity to radiant energy, 48, 



119, 166 

 Water-air interface, 206 

 Water phantom, 47 

 Waves, de Broglie, 331 

 Weber-Fechner law, 288 

 Westinghouse Sterilamp, 140 

 Weston photoelectric cell, 155, 156 

 Work function of platinum, 2 



X-ray, absorption, by barium sulphate, 

 16 

 coefficients, 17, 18, 20, 21 

 by gases, 16 

 law, 16 

 by tissues, 16 

 effective wavelength, 28, 29 

 effects, on Drosophila, 36, 85, 86 

 on Escherichia coli (B. coli), 35 



X-ray, effects, on mutation, 36 

 efficiency of emission, 7 

 filters, metal, 19 

 fluoroscope, 49 

 generation, 5 

 hardness table, 7 

 homogeneous, 29 

 ionization, doses, 35 



of gases, 38, 39 

 luminescence, 49 

 mass absorption coefficients, 18 

 photographic sensitivity, 50 

 photon, 24 

 protection, 36, 38 

 scattering, 27 

 spectra, 8, 9, 11 

 spectrometer, 12 

 transmission by lead, 37 

 tubes, 1^, 52 



Young-Helmholtz color theory, 129 



