ROENTGEN ABSORPTION HISTOSPECTROSCOPY 



129 



TABLE III 



Wavelength of the Absorption Edges for Certain Elements and Suitable 

 Analysis Lines (Engstrom, 1946) 



where (mi/p) and {m/p) represent the mass absorption coefficients 

 for the element at wavelengths Xi and X2, respectively, p, the specific 

 gravit}^ of the absorbing substance, and /x, the linear absorption coef- 

 ficient ; ii and h are the intensities of transmitted radiation of wave- 

 lengths Xi and X2, respectively, and /i and I2, the corresponding in- 

 tensities of the incident radiation, P is a function of atomic number 

 and wavelength. When the wavelengths are selected close to the 

 absorption edge, and the intensities of the incident radiation of both 



