By Donald L. Horrocks
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Extra resources for Applications of Liquid Scintillation Counting
25 eV. The photons produced as a result of the stoppage of the ionizing particle will have a variation of energies depending on the particular solute and the energy level of the excited fluorescent state. 73 eV. The total energy in the form of photons is the energy of each photon times the number of photons of that energy summed over the wavelength spread of the photons. The emission spectrum for a solute is a plot of the wave number ( = 1/2) versus the relative number of photons of the given wave number.
Energy transfer between unlike solute molecules is also a monoenergetic process but is usually accompanied by a vibrational relaxation in the acceptor molecule which leads to the trapping of the energy in the acceptor molecule. It is possible to have a reverse energy transfer if the acceptor molecule is first given a small amount of excess energy (corresponding to the energy difference in the S1 excited energy levels of the acceptor and donor molecules) that can be considered as an activation energy.
F. N. Hayes, B. S. Rogers, P. Sanders. R. L. Sehuch, and D. L. Williams, Rep. LA-1639, Los Alamos Sci. , Los Alamos, New Mexico, 1953. J. B. Birks, J. C. Conte. and G. Walker, IEEE Trans. 1,Tucl. Sd, NS-13 (3). 148 (1966). IS. J. B. Birks, in "Organic Scintillators and Liquid Scintillation Counting" (D. L. 1-lorrocks and C. T. Peng. ), p. 3. Academic Press, New York, 1971. R. Voltz, 0. Laustriat, and A. Coche, C. R. Acad. Sci. Paris 257, 1473 (1963). F. N. Hayes, B. S. C. Sanders, Nucleonics 13(l), 46(1955).
Applications of Liquid Scintillation Counting by Donald L. Horrocks