Four Input Multiplexer for Two-Dimensional Gamma-Ray Spectrometry

The use of two-dimensional gamma-ray spectrometry is becoming a standard radiochemical technique for the analysis of cascaded gamma emitters. Coincidence and noncoincidence events from a sample station detector pair are usually stored and displayed in a rectangular data array. Half of this array is redundant if both detectors are identical and matched as to energy response, and another half of the array may be nonessential if the energy scale is adjusted so that all sum peaks of interest have a total energy that is less than the full scale energy of the X and Y axes. The four input multiplexer is a digital device which allows one to feed pulses from four two-dimensional sample stations into one ADC pair and 4096 memory and still record all essential data. Further, the noncoincident data from each sample station is recorded in 240 channels to provide improved singles energy resolution.