1. (1) H. Pollak, Phys. Stat. Sol. 2, 720 (1962).
2. (2) S. Wexler “Actions Chemiques et Biologiques des Radiations,” edited by M. Haissinsky (Mason, Paris, 1965), p. 103.
3. (3) A. H. Snell, “Alpha-, Beta-, and Gamma-Spectroscopy,” edited by K. Siegbahn (Interscience, New York, 1964), p. 1545.
4. (4) A. R. Kazanjian and W. F. Libby, J. Chem. Phys. 42, 2778 (1965).
5. (5) A. Nath, M. Harpold, and M. P. Klein, Chem. Phys. Lett. 2, 471 (1968).