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By Donald L. Horrocks

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Appi. Radiat. Isorop. 8,29(1960). D. L. Horrocks, Rev. Set. Instrum. 35, 334 (1964). K. F. Flynn, L. E. Glendenin, E. P. Steinberg, and P. M. Wright, JVucl. Instrum. Methods 27, 13(1964). R. D. Brooks, Progr. Nuci. Phs. 5, 284 (1956). D. L. Horroeks, Rev. Sci. Instrum. 34, 1035 (1963). A. Skerbele and E. N. 1. Che,n. Phys. 42, 395 (1965). H. B. Kievens and J. R. J. Chern. Phys. 17, 470 (1949). D. L. Horrocks, J. Chem. Phys. 52, 1566(1970). Ii. J. B. Birks, C. L. Braga, and M. D. Lumb, Brit. J. Appi.

It is shown that even a 1-keV electron will, on the average, produce enough excited molecules to emit 13 photons. 1-keY electron will give an Nh greater than 1. 042 "J. B. Birks, "The Theory and Practice of Scintillation Counting," pp. 241-244. Pergamon, Oxford, 1964. bj Hasings and G. Weber, J. Opt. Soc. Amer. 53, 1410 (1963). P. Skarstad, R. Ma, and S. Lipsky, Mo!. Crys!. 4, 3 (1968). When these photons escape from the scintillator solution and are directed onto the face of a multiplier phototube, a certain fraction of them will interact with the photocathode material, producing a certain average number of photoelectrons.

Thus the distribution of light is different and the multiplier phototube response may be different. If the multiplier phototube response is less, the scintillation efficiency will he decreased. Also the cxcimer is quenched to a higher degree than the monomer because of its longer lifetime. Thus in air-saturated scintillator solutions the excimers are efficiently quenched, which leads to a decreased scintillation yield for compounds that form excimers. The third problem associated with solute concentrations, selfabsorption, is critical in the measure of the scintillation yield.

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