The spectra of electrons resulting from the interaction of 145-keV $\gamma$ rays with Zr, Ag, Sn, Ta, and Pb have been obtained using a well-type plastic-scintillation spectrometer. The number of $K$-shell photoelectrons in each case is estimated by fitting a Gaussian to the respective resolved photoelectron spectrum, and hence the $K$-shell photoelectric cross sections are estimated. They are found to be 32 ± 2, 68 ± 4, 83 ± 5, 348 ± 21, and 537 ± 32 b/atom, respectively. These values are in good agreement with the interpolated values of Schmickley and Pratt.

• Received 14 March 1973

DOI:https://doi.org/10.1103/PhysRevA.8.2425