By Lawrynowicz J. (Ed)
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Spatial discrimination is achieved simply by the relative position of the two counters. The fast channel can be constructed with 8 9 a resolving time of the order of 10~ -10~ sec thereby enabling one to make time measurements in that range. T. Phos. A. A. SC Slow Coincidence FIG. 1. Block diagram of typical channel of a fast-slow coincidence scintillation spectrometer. , pulse-height analyzer; SC, scaler. to obtain optimum energy resolution have fluorescence decay times of 6 about 10~ sec. Consequently, coincidence circuitry designed to operate 9 on a 10~ -see basis does not allow the collection of all the photoelectrons.
A trivial modification of this scheme, which has two significant advantages, is illustrated by the absorber placed in front of the crystal. A first and rather obvious advantage of the absorber is that it permits the detection and measurement of rela tively low-intensity particle groups, providing their energy loss in the absorber is small, compared to an intense particle group with shorter range. A situation of this sort exists, for example, in the measurement 40 Ν. S. WALL of proton groups from either deuteron (30) or alpha-particle (31) induced reactions.
2. * However, many experimental relations exist between the important factors which are most useful. Figure 4 shows the back diffusion thickness (thickness for saturated back scattering) versus the primary energies of the electrons. For a continuous ^-spectrum, the back diffusion thickness is plotted against the maximum energy of the /3-spectrum as shown in Fig. 5. To show the dependence of diffusion processes on the atomic number Z, the back diffusion coefficient ρ (the ratio of the 4 0 0 ι 1 1 1 CVJ I 300 Ε ω en UJ * o 2 0 0 I »ζ o c/> £ 100 5 Ü < GO 0 ~ TÖ 0 5 M0N0ENERGETIC ELECTRON ' Γ5 ENERGY(Mev) 2 FIG.
Analytic Functions Kozubnik 1979: Proceedings by Lawrynowicz J. (Ed)